Iswap gate Id like to decompose root iswap gate into root cz (not cz or cx) and single-qubit gates. Therefore, a simplified model for linear XEB is Using this approach, we experimentally demonstrate CZ and ZZ-free iSWAP gates with two-qubit interaction fidelities of 99. Also, users can access information about quantum computing concepts. This is a Clifford and symmetric gate. Maximum strength (full cz) is at pi. Source data Extended Data Fig. We characterize the innate dipolar The iswap gate is an entangling swapping gate where the qubits obtain a phase of iif the state of the qubits is swapped. In the scheme In particular, we implement and benchmark native ISWAP, SWAP, $\sqrt{\text{ISWAP}}$, and BSWAP gates. You switched accounts on another tab or window. B-gates lead to gate count increases and possible fidelity decreases. The gate generalizes the CNOT implementation of the SWAP gate for qubits and keeps its most important properties, like symmetry and simplicity. II. Can be applied to a QuantumCircuit with the iswap() method. 11358 (2021 Bases: qiskit. Further, MIRAGE uses mirror gates to reduce routing pressure and reduce true circuit depth instead of just minimizing SWAPs. [3] [1]The global phase gate introduces a global phase to the whole qubit quantum state. ISWAP**t is the same as cirq. 76±0. To get the matrix representation of each gate, we can call the class The generation of high-fidelity distributed multi-qubit entanglement is a challenging task for large-scale quantum communication and computational networks 1,2,3,4. The pulses After the second iSWAP 11−20 gate, this phase shows up as a conditional phase on \({\left|{11}\right\rangle}\). Example: ISWAP 5 6 ISWAP 42 43 ISWAP 5 6 42 43 Though one may request a cirq. Gate with information such as gate name, target qubits and arguments. At the other end of the spectrum, we show that several low-entanglement gates such as 4 √ CNOT and √ iSWAP are sometime able to offer similar expressive performance as maximally entangling gates for important circuits such as TFIM, QFT, and QAE, leading to better Compared to the composite nonadiabatic geometric fSim gate composed of a nonadiabatic holonomic cp gate and a nonadiabatic geometric iswap gate, our scheme takes only half the time and demonstrates robustness to parameter fluctuations, as well as to environmental impacts. to_matrix() Return a numpy. MODEL An iSWAP gate is de ned as iSWAP = 2 6 4 1 0 0 0 0 0 i 0 0 i 0 0 0 0 0 1 3 7 5: This is a unitary operation that may be generated by a two-qubit interaction Iswap gate is universal quantum gate which can be used with single Qubit gates to implement any quantum circuit or algorithm. ISwapPowGate(exponent = t) Parity gates: The gates cirq. Reload to refresh your session. 32(3)%, 99. Moreover, the scheme does not require complex controls, making it very . The faster (median 56 nanoseconds), more specialized fSim gates are useful for specific algorithms such as random circuit sampling, as recently demonstrated on Google’s Willow system. It would look something like - from qiskit. iSWAP gate. Patenotte,1,2,3 Samuel Gebretsadkan,1 The iSWAP gate [22][23][24] [25] [26][27][28][29][30][31][32][33][34] is one of the basic two-qubit logic gates which is also an important quantum gate, that can be widely used in quantum Applying an ac flux pulse, we can perform a maximally entangling universal gate ($\sqrt{\rm iSWAP}$) with an average fidelity over 99. It is very likely that the depth of the circuit can be further reduced by merging quantum gates. In both cases, n depends on the Feb 1, 2023 · [45–50] Particularly, the iSWAP gate has become a key topic in scalable quantum computation. Using this approach, we experimentally demonstrate CZ and Z Z-free iSWAP gates with two-qubit interaction fidelities of 99. Feb 15, 2023 · A quantum instruction set is where quantum hardware and software meet. unitary function, is: In section 3. SQRT_ISWAP gate, the quantum state may be affected by a unitary effect that is close to, but not exactly, a cirq. . 87 ± 0. 9 μm, we create a maximally entangled Bell state with a fidelity of 94(3)% in trials in which both molecules are present. Swaps two qubits and phases the -1 eigenspace of the ZZ observable by i. 72(2)% and 98. Its action is to swap two qubit states and phase the ∣ 01 |01\rangle ∣01 and ∣ 10 |10\rangle ∣10 amplitudes by i. The unitary of this gate, which can also be found via the cirq. A quantum state is uniquely defined up to a phase. Determines how much the |11 state is phased. Gate iSWAP gate. XX, cirq. QubitCircuit to represent a quantum circuit. qasmu_gate (args[, N, target]) QASM U-gate as defined in the OpenQASM standard. An advantage of this approach is that it minimizes leakage generation. Sub-millisecond Entanglement and iSWAP Gate between Molecular Qubits Lewis R. assemble() Assemble a QasmQobjInstruction: broadcast_arguments(qargs, cargs) Validation and handling of the arguments and its iSwapGate. class iSwapGate. Applications of multi-mode bus couplers can be helpful for improving iSWAP gate fidelity and gate speed beyond the limit of single-mode scenario. ISWAP ** 0. The most common model for quantum computing is the quantum circuit model. Several places throughout Cirq define it and one place even defines it a View PDF Abstract: We propose $\mathrm{SQiSW}$, the matrix square root of the standard $\mathrm{iSWAP}$ gate, as a native two-qubit gate for superconducting quantum computing. The gate brings to the equal-weight superposition . Picard,1,2,3, ∗Annie J. Once decoherence is taken into consideration, the delity greater than 99:9% requires that the For example, if we attempt to move a King piece from the 'a1' square to the 'b1' square, we will perform a iSWAP gate between the qubits that represent the 'a1' and 'b1' squares. Parens Arguments: This instruction takes no parens arguments. This move will be analogous to moving a piece to two different target squares simultaneously. We describe the The leakage is small for the iSWAP gate scheme, and the optimized results have a leakage smaller than 10 −4. The advent and use of coupler elements to tunably control two-qubit devices. Ultimately, improvements to the iSWAP gate delity will most readily be obtained by increasing the spin-photon coupling rate g sand reducing the cavity de-cay rate . 9% is obtained. Similarly, the TOFFOLI and FREDKIN gates are each known to be universal for classical reversible computing. Moreover, using a dc flux pulse alternatively, we can achieve another kind of Users will be able to operate these higher fidelity and universal iSWAP gates for a wide range of algorithmic research, with a median gate time of 72 nanoseconds. 183 ns we demonstrate a universal two-qubit gate — the iSWAP gate — with 0. Applying these techniques to our fluxonium processor, we show that replacing the iSWAP gate by its square root SQiSW leads to a significant performance boost at almost no This gate has a duration of 12ns. You signed in with another tab or window. We found that the fidelity of generated Bell states is presently limited by the thermal motion Download scientific diagram | A pulse sequence for a √ iSWAP gate between qubits 1 and 2. This is not correct if we An iSWAP gate, when sequentially combined with single-qubit operations, can generate bipartite entanglement deterministically and form a universal set of quantum gates, which is the essential resource for all quantum information applications (12, 43). Split move. The ISWAP gate is designed using resonator as a coupler for Qubits. In this paper to describe our system, the Heisenberg equations of A quantum instruction set is where quantum hardware and software meet. A larger hardware-native gate set may decrease the number of required gates, provided that all gates are realized with high fidelity. Superconducting qubits afford versatility in the implementation of two-qubit gates as we can engineer interactions between states, and have access to a rich level structure. The deterministic entanglement The iswap gate. To illustrate this, we demonstrate that an i swap gate with a fast gate speed and dramatically lower conditional Creates an instruction with gate repeated n amount of times. It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4. Precise control of the relative phase of the qubit-control pulses and the parametric-coupler drive is achieved with a multi-channel instrument called Presto using direct digital synthesis (DDS), a promising technique for scaling up quantum systems. gate and j000ifor the bSWAP gate. 5% median two-qubit gate fidelity, with significant improvements in iSWAP and fSim gate fidelity. Gate. iSWAP gate. To illustrate this, we demonstrate that an i swap gate with a fast gate speed and dramatically lower conditional High-fidelity two-qubit gates at scale are a key requirement to realize the full promise of quantum computation and simulation. Circuit Symbol: iSWAP gate. (b) Probability of finding the qubits in a state as a function of number of applied Cliffords. Methods. You signed out in another tab or window. 1)Is it possible to decompose like that? 2)Is there a way to do such a decomposition with qiskit, qutip, etc. A 2-qubit XX+YY interaction. In particular, access to a gate set that includes support for the CZ-type, the iSWAP-type, and the SWAP-type families of gates, renders conversions between these Dec 9, 2024 · The estimated \(\sqrt{{{\rm{iSWAP}}}}\) gate fidelity reported in the main text is an average over the the numbers from a and b. The most interesting universal sets of gates are those containing a single gate. Furthermore, we apply these techniques for an efficient construction of the B gate: a perfect entangler from which any two-qubit gate can be reached in only two applications. class iSwapGate(label=None). Note: uses opposite sign convention to the iSWAP gate. The Bell state creation protocol demonstrated thus far limited the duration of the interaction using global pulses applied to a particular initial state, but it cannot be Download scientific diagram | Construction of the SWAP gate from three √ iSWAP gates augmented with single-qubit rotationsˆUrotationsˆ rotationsˆU x (π/2) andˆUandˆ andˆU y (π/2) and its Is your feature request related to a use case or problem? Please describe. Square root of iSWAP. Its action is to swap two qubit states and phase the ∣ 01 |01\rangle ∣01 and ∣ 10 |10\rangle ∣10 amplitudes In this work, we demonstrate an iSWAP gate, in the class of universal logic gates, to entangle hyperfine states of pairs of individually trapped NaCs molecules. Moreover, using a dc flux pulse alternatively, we can achieve another kind of Our entanglement protocol implements an iSWAP gate that, along with site-resolved single-qubit rotations achievable in our platform through the optical addressing of individual molecules, fulfills the requirement for universal quantum computation. Experimentally, the j100i The third variation, known as iSWAP Surface Code, replaces the traditional CNOT/CZ two-qubit gates with the iSWAP gate. iSWAP=2π as a function of CPLR frequency ω c by fitting the excitation exchange oscillations. 3. Bases: Gate. The gate can be implemented using superconducting circuits or other systems which natively features an XY-interaction. Characterization attempts to identify the actual effect of the gates using repeated expressions of the two-qubit layer. The inverse (cirq. c, The |GHZ〉 sequence is a translation of the circuit in Fig. We show these native two-qubit gates are better than their Up to now, a large number of theoretical proposals have been introduced to implement various gates, such as two-qubit Controlled-NOT (CNOT) gate [8], SWAP gate [9], iSWAP gate [10], √ iSWAP gate Create new iSwap gate. phi: Controlled phase angle, in radians. When will Ankaa-3 be available on cloud platforms? Here we harness intrinsic molecular resources to implement a two-qubit iSWAP gate using individually trapped X 1 Σ + NaCs molecules. Cross-resonance gates have been the workhorse of fixed-coupling, fixed-frequency The identity gate is the identity operation | = | , most of the times this gate is not indicated in circuit diagrams, but it is useful when describing mathematical results. However, universal two-qubit gates have not been demonstrated with molecules. soft_compare(other) Soft comparison between gates. showing the resonator, ground planes and gate fan-out Users will be able to operate these higher fidelity and universal iSWAP gates for a wide range of algorithmic research, with a median gate time of 72 nanoseconds. Xiu Gu, Jorge Fernández-Pendás, Pontus Vikstål, Tahereh Abad, Christopher Warren, Andreas Bengtsson, Giovanna Tancredi, Vitaly Shumeiko, Jonas Bylander, Göran Johansson, and Anton Frisk Kockum, Fast Multi-Qubit Gates through Simultaneous Two-Qubit Gates, Fast multi-qubit gates through simultaneous two-qubit gatesarXiv:2108. Its action is to swap two qubit states and phase the ∣ 01 |01\rangle ∣01 and ∣ 10 |10\rangle ∣10 amplitudes In practice, for gates which come from a time evolution (such as iSWAP) the 2-qubit gates are likely the ones which fix the choice of $i$, since it is typically easy to reverse the sign This is a Clifford and symmetric gate. It has been described as being a "wait cycle", [2] and a NOP. In particular, for the detunings of the device in this work, 854 MHz, the leading gate for Given the recent attention to √iSWAP as a powerful basis gate with decomposition advantages over CNOT, we show how systems that implement the iSWAP family of gates can particularly benefit from mirror gates. 5) is also available. We characterized the compound SWAP gate using a cross-Ramsey sequence with two-qubit input states, followed by post-processing to account for SPAM errors. The gates such as the prominent CNOT gate, the iSWAP gate, as well as the √ iSWAP gate. This paper proposes a microwave-control protocol for implementing a two-qubit iSWAP gate in superconducting quantum circuits with fixed-frequency qubits and couplers. Therefore, it is a good approximation to compute the fidelity based on the truncated High-fidelity parametric gates have been demonstrated with superconducting qubits via rf flux modulation of the qubit frequency. They proved that the fidelity of an iSWAP gate is high in the presence of spontaneous emission and cavity decay. Recently, #4213 added (will add) the SQRT_ISWAP=ISWAP**0. molmer_sorensen (theta[, phi, N, targets]) Quantum object of a Mølmer–Sørensen gate. In both cases, n depends on the particular resonance condition. It opens up new possibilities for realization of scalable entangling gates that belong to di erent classes of local equivalence: (i) the CZ gate, (ii) the iSWAP gate, and (iii) the p iSWAP gate. This gate is equivalent to an FSimGate(-π/4, 0). ISWAP ** -0. ? Determined by the strength and duration of the XX+YY interaction. Finally, through a succession of two Hadamard gates, the coherence time of a 3-state The 'ISWAP' Gate. This gate can be built with two standard higher-dimensional [45–50] Particularly, the iSWAP gate has become a key topic in scalable quantum computation. to_matrix() Return a Numpy. qasm() Return a default OpenQASM string for the instruction. Software Discover What is quantum computing? Educational resources Our Work Roadmap Quantum Computer Research Publications Open Source Tools Cirq Documentation About Team Lab Careers / The hardware provides the square root of the iSWAP gate using cirq. add_decomposition(decomposition) Add a decomposition of the instruction to the SessionEquivalenceLibrary. The frame tracking for the iSWAP gate will be discussed in detail in § III. Unlike drive-activated gates, the exchange interaction strength does not decrease when the qubit-qubit detuning is larger than the anharmonicity. Jun 15, 2023 · A deterministic single-photon two-qubit SWAP gate between polarization and spatial-momentum is demonstrated on a silicon chip. 4%, relying on the adiabatic interaction between the |11> and |02> states. library import iSwapGate sqrt_iSWAP = iSwapGate(). iSWAP门的主要作用是交换两个比特的状态，并且赋予其 \pi/2 的相位。通常会用一个完整的翻转，即 \theta = \pi/2 来指代iSWAP。当角度为iSWAP的一半时，即 \theta=\pi/4 时，称为 \sqrt{iSWAP} 。对于iSWAP门来说，两个比特之间的地位是对等的，不存在控制与受控的关系。 For example, a recent implementation of the surface code utilized the 𝗂𝖲𝖶𝖠𝖯 𝗂𝖲𝖶𝖠𝖯 \operatorname{\mathsf{iSWAP}} sansserif_iSWAP gate—a functionality readily available in superconducting processors but rarely employed in surface code implementations. The team reported improvement results for each of the variations of Λ 35,hex = 2. Circuit Symbol: IN NO EVENT SHALL THE COPYRIGHT # HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) Applying an ac flux pulse, we can perform a maximally entangling universal gate ( iSWAP ) with an average fidelity over 99. GitHub. __init__() Create new iSwap gate. 982 average gate fidelity. 4 iSWAP oscillations between the two The first term in Eq. 1. We verify the gate performance by measuring its logical truth table. 69(6), and Λ 35,iSWAP = 1. However, this method is not fully optimized. 15(2), Λ 35,walk = 1. Improve this question. The You can implement an arbitrary unitary matrix as a Unitary Gate using the UnitaryGate class that qiskit provides. Here we present a simple implementation of the controlled-iswap gate. qip. [52,53] In this work, we propose a scheme to realize an iSWAP-like gate which can be denoted as Nov 2, 2020 · View a PDF of the paper titled Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler, by Youngkyu Sung and 16 other authors. Here we explain the theoretical concepts behind this protocol that achieves fast gate times with only $σ_z$ control of the Hamiltonian, based on a theory of non-linear mapping of state As shown, the previously existent phase gate of angle \(k\) can be realized as a shift on the phase of the second pulse, \(\nu \rightarrow \nu + k\). The gate relies on Here, we harness intrinsic molecular resources to implement a two-qubit iSWAP gate using individually trapped X1Σ+ NaCs molecules. Here, we realize a parametric-resonance gate, which is activated by bringing the average frequency of This paper presents a implementation for a controlled-iSWAP gate working by applying a single lux pulse. In QuTiP, we use qutip. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, Repository containing the front-end of the Quantum Inspire project. ndarray containing the definition of your valid unitary gate and a name for that unitary. 76 ± 0. It is possible to create a $\sqrt{iSWAP}$ gate like this:. , an iSWAP gate). 99% and a short gate time of about 24 ns. In this work, we demonstrate an iSWAP gate, in the class of universal logic gates, to entangle hyperfine states of pairs of individually trapped NaCs molecules. This class can be instantiated with an np. 56(2). Circuit Symbol: The iswap gate is an entangling swapping gate where the qubits obtain a phase of i if the state of the qubits is swapped. To implement fast two-qubit gates (we use a 60-ns-long CZ gate and a 30-ns-long iSWAP gate), a strong coupling strength is required, which strongly hybridizes the CPLR with both QB1 and QB2 [g ic=ðω c −ω iÞ≈1=3]. iSwapGate(*args, _force_mutable=False, **kwargs). The faster (median 56 nanoseconds), more specialized fSim gates are useful for specific algorithms such as random circuit sampling, as recently demonstrated on Google's Willow system. We elucidate the resonance conditions required to drive iSwapGate. Follow edited Nov 24, 2020 at 14:20. Circuit Symbol: iSwapGate. Each quantum gate is saved as a class object qutip. Nonetheless, two-qubit gate errors still limit the capability of near-term quantum applications. 3 can be used to implement an iSWAP gate (5, 24, 31) of duration π/2g n, whereas either of the latter two terms can be used to implement a CZ gate (9, 10, 24, 32) of duration π/2g n. 23%, respectively, which are close to their T1 We experimentally demonstrate a parametric iSWAP gate in a superconducting circuit based on a tunable coupler for achieving a continuous tunability to eliminate unwanted qubit interactions. The possibility to utilize different types of two-qubit gates on a single quantum computing platform adds flexibility in the decomposition of quantum algorithms. Targets: Qubit pairs to operate on. 9 μm, we create a maximally entangled Bell state with a fidelity Compared to the composite nonadiabatic geometric fSim gate composed of a nonadiabatic holonomic CP gate and a nonadiabatic geometric iSWAP gate, our scheme only takes half the time and demonstrates robustness to parameter fluctuations, as well as to environmental impacts. validate_parameter(parameter) Gate parameters should be int, float, or ParameterExpression By applying the iSWAP gate twice, the CNOT opera-tion can be constructed = [π/2]x iSWAP [π/2]z [π/2]z iSWAP [π/2]x [π/2]z (2) We mention that in complex circuits the length of this se-quence can be reduced by noting that the “outer” one-bit operations partially cancel out with preceding or subse- iSwapGate. Applying these techniques to our fluxonium processor, we show that replacing the iSWAP gate by its square root SQiSW leads to a significant performance boost at almost no Dec 20, 2024 · This extends the available gate set in this architecture to include the iSWAP gate, reducing the need for three CZ gates to just one iSWAP and one CZ gate for each decompiled SWAP gate. Laser-cooled molecules in a reconfigurable optical tweezer array. For iSWAP gates, the phases in front of the gate can be moved to the back according to the following rule Z(ϕ 1) iSWAP ⇒ iSWAP Z(ϕ 2) Z(ϕ 2) Z(ϕ 1) (2) This makes iSWAP compatible with virtual Z rota-tions [20]. We develop characterization and compilation techniques for non-Clifford gates to accurately evaluate its designs. The Comparing the dressed cycle data to the reference cycle result allows us to estimate the average gate fidelities of the implemented iSWAP, CZ and SWAP gates to be 99. The faster (median 56 nanoseconds An iSWAP gate, when sequentially combined with single-qubit operations, can generate bipartite entanglement deterministically and form a universal set of quantum gates, which is the essential resource for all quantum information applications (12, 43). (a) Microwave pulse sequence for implementing an iSWAP gate between two hyperfine qubits. We show numerically that it has potential for an ultra-high fidelity implementation as its gate time is half of that of $\mathrm{iSWAP}$, but at the same time it possesses powerful The observations are consistent with iSWAP oscillations of the spin qubits, and suggest that entangling operations are possible in 10 ns. Right panel: Oscillation frequencies of the iSWAP gate in (c) and the bSWAP gate in (d) as obtained from the state occupations shown in (a) and (b), respectively. And it will naturally occur in a quantum system with XY interaction or the Heisenberg models, e. Since the system coupling is "natural" for this gate, no single-qubit rotations are needed. gate. The proposed multi-mode bus coupling architecture is compatible with a scalable variation of the traditional bus coupling architecture. power(1/2) The matrix representation is the following: In this paper we present a scheme to directly implement the iSWAP gate by passing a cyclic three-level system across a two-mode cavity quantum electrodynamics. 2 of this PDF, The general SWAP gate is defined as $ S (\alpha, \hat{y}) = \begin{bmatrix} 1 & 0 & 0 & 0 \\ 0 & \cos(\alpha/2) & -\sin(\alpha/2) & 0 \\ 0 & \sin(\alpha/2) & \cos(\alpha/2) & 0 \\ 0 & 0 & 0 & 1 \\ \end{bmatrix} $ The same lecture notes claim that for $\alpha = \pi$, you get the SWAP gate. We implement the twoqubit iSWAP gate by applying a fast-flux bias modulation pulse on the coupler to turn on parametric exchange interaction between computational qubits. Its action is to swap two qubit states and phase the |01\rangle ∣01 and |10\rangle ∣10 amplitudes by i. reverse_ops() For a composite instruction, reverse the order of sub-instructions. Users will be able to operate these higher fidelity and universal iSWAP gates for a wide range of algorithmic research, with a median gate time of 72 nanoseconds. g. SQRT_ISWAP. class qiskit. In particular, access to a gate set that includes support for the CZ-type, the iSWAP-type, and the SWAP-type families of gates, renders conversions between these gate families unnecessary during compilation as any two-qubit Clifford gate can be executed using at most one two-qubit gate from this set, plus additional single-qubit gates. 07 % and 99. We only use three copies of the same controlled qudit gate. 5% median two-qubit gate fidelity. YY, Fixed-frequency superconducting qubits demonstrate remarkable success as platforms for stable and scalable quantum computing. For some of the gates listed above, QubitCircuit also has a primitive resolve_gates method that decomposes them into elementary gate sets such as CNOT or SWAP with single-qubit gates (RX, RY and RZ). 1 of 4. library. Without some other gate, you just won't be able to mix or transition between parts of the superposition that have different numbers of bits set. Circuit Symbol: Reference Implementation: iSWAP gate. 5. The faster (median 56 nanoseconds This rate λ depends on the gate and was λ = 1/4 for the iSWAP-like gates employed in our experiment (Supplementary Information section D). Furthermore, we apply these techniques for an efficient construction of the B-gate: a perfect entangler from which any two-qubit gate can be reached in only two applications. , superconducting circuits and solid-state qubits. repeat(n) Creates an instruction with gate repeated n amount of times. 93(5 The SWAP gate is a gate in quantum computing that swaps the states of two qubits. phasegate (theta[, N, target]) Returns quantum object representing the phase shift gate. The projects consists of an in-browser editor that allows the user to write and run/simulate quantum algorithms written in QASM. This speed is comparable to resonance-based gates for slightly detuned tunable qubits. Park,2,1,3, Gabriel E. unitary function, is: We present a quantum SWAP gate valid for quantum systems of an arbitrary dimension. Here, we benchmark both controlled-Z (CZ) and exchange-type (iSWAP) The dipolar exchange interaction can naturally realize an iSWAP gate, which is a universal two-qubit gate, when the duration of the interaction is precisely controlled . So you just won't be able to perform a $\text{CNOT}$. Here we harness intrinsic molecular resources to implement a two-qubit iSWAP gate using individually trapped X 1 Σ + NaCs molecules. 5 gate to the core set of gates. The solid line is the best fit of the oscillation frequencies (circles) to an effective two-state model. ISwapPowGate The iSwap gate swaps the |01 and |10 states and adds a relative phase of i. An iSWAP gate is activated when the modulated qubit 2 is brought into resonance with the other qubit for a half cycle of oscillation of population j10i, whereas a CZ gate is enacted by bringing j11iand j02i(or j20i) into resonance by tuning the average frequency of the modu-lated qubit for a full cycle of population oscillation. The aforementioned two-qubit gates are effectively equiv- Thus, two-qubit gates, such as a cross-resonance gate or an i swap gate, can be realized without a detrimental effect from the static Z Z interaction. cirq. [52,53] In this work, we propose a scheme to realize an iSWAP-like gate which can be denoted as Applying an ac flux pulse, we can perform a maximally entangling universal gate ($\sqrt{\rm iSWAP}$) with an average fidelity over 99. In this way, we go back to a situation where we have a phase gate at the end (with an updated carry \(k'\)). Fig. Using one of each of these gates, we can perform an arbitrary two-qubit gate within the excitation-preserving subspace allowing for a complete implementation of the so-called Fermionic Reuse & Permissions. The paper also discuss a quantum circuit for probabilistic exponentiating the iSWAP gate and other non-Hermitian gates. glS ♦. 07% and 99. array for the iSWAP gate. 87±0. We benchmark the fidelity of the iSWAP-like and controlled-phase gate families as well as 525 other fSim gates spread evenly across the entire fSim(θ,ϕ) parameter space, achieving a purity Our entanglement protocol implements an iSWAP gate that, along with site-resolved single-qubit rotations achievable in our platform through the optical addressing of individual molecules, fulfills the requirement for universal A controlled-phase gate was demonstrated in superconducting Xmon transmon qubits with fidelity reaching 99. We extract an EPC of 1% for our highest-fidelity double pulsed gate. At the beginning, we confirm the working frequencies of the couplers: Let Q 2 and Q 4 execute the procedure of basic iSWAP gate with Q 0, respectively, and then we decide the coupler frequencies Request PDF | On Jan 1, 2022, Amit Kumar Sharma and others published Deterministic Two Qubit iSWAP Gate Using a Resonator as Coupler | Find, read and cite all the research you need on ResearchGate We implement an iSWAP gate with two transmon qubits using a flux-tunable coupler. The hardware provides the square root of the iSWAP gate using cirq. The first term in Eq. The interaction is toggled by transferring between interacting and non-interacting states to realize an iSWAP gate. Can be applied to a QuantumCircuit with the Dec 19, 2024 · It is advantageous for any quantum processor to support different classes of two-qubit quantum logic gates when compiling quantum circuits, a property that is typically not seen with existing platforms. array for the gate unitary matrix. Creates a unitary gate as gate^exponent. B. The split move is unique to quantum chess. from qiskit. Note This gate is generated by applying the available coupling interaction, , for time t iSWAP = π/2g, where g is the coupling strength, is Planck’s constant divided by 2π and the σs are Pauli X Ankaa-3 has achieved a 99. The NAND gate, the NOR gate, and the NMAJORITY gate, are all known, individually, to be universal for classical irreversible computing. Can be applied to a QuantumCircuit Finally, we identify two non-interacting hyperfine states within the ground rotational level in which we encode a qubit. ISWAP / cirq. We computationally show that all three gates can be implemented with delity >99:99% for unitary evolution. Our implementation makes use of a superconducting quantum processor design based on Thus, we can control the interaction with a high on-off ratio to implement two-qubit controlled-Z gates, or suppress it during two-qubit gate operation using X Y interaction (e. Note: uses opposite sign convention to the CZPowGate. Quantum object representing the iSWAP gate. Moreover, the scheme does not require complex controls, making it Depending on the delay, an iSWAP or a CZ gate can be generated. One prominent implementation is the parametrically modulated coupler, In 2017, Luo et al showed that an iSWAP gate between two atoms could be achieved based on different detunings. Equivalent to SWAP then CZ then S on both targets. Can be applied to a QuantumCircuit with the iSWAP gate. validate_parameter(parameter) We implement two gate families: an iSWAP-like gate to attain an arbitrary swap angle, $\theta$, and a CPHASE gate that generates an arbitrary conditional phase, $\phi$. Its action is to swap two qubit states and phase the ∣ 01 |01\rangle ∣01 and ∣ 10 |10\rangle ∣10 amplitudes by (d) Schematic representation of the effect of the iSWAP gate on a pair of qubits, initialized in the computational basis state . This highlights the potential of exploring alternative strategies. Bases: SingletonGate iSWAP gate. We can repeat this process until the moment we measure the qubit, at which point, as we’ve seen, the remaining phase gate is The iswap gate is an entangling swapping gate where the qubits obtain a phase of i if the state of the qubits is swapped. (b) Time-evolution of resonant dipolar exchange for a pair of molecules initially prepared in the two In principle, the order of the CZ and iSWAP gates in (d) is irrelevant as they commute. 1b, with the iSWAP gates implemented by tuning the qubits pairwise into resonance for time t iSWAP = 40 ns and π/2 rotations Users will be able to operate these higher fidelity and universal iSWAP gates for a wide range of algorithmic research, with a median gate time of 72 nanoseconds. Maximum strength (full iswap) is at pi/2. The modulation however leads to renormalization of the bare qubit-qubit coupling, thereby reducing the gate speed. A two-qubit swapping process fidelity of 94. 27k 6 6 gold We find that the bSWAP gate is generally slower than the more commonly used iSWAP gate, but features favorable scalability properties with less severe frequency crowding effects, which typically degrade the fidelity in multi-qubit setups. Reuse & Permissions. Our theoretical results are backed by experimental measurements as well as exact numerical simulations We experimentally demonstrate that a SWAP gate can be decomposed into one iSWAP gate followed by one CZ gate, affirming a more efficient compilation strategy over the conventional approach that relies on three iSWAP or three CZ gates to replace a SWAP gate. Ankaa-3 has achieved a 99. Finally The $\sqrt{\text{SWAP}}$ gate, and the $\text{iSwap}$ gate, both have this preserve-number-of-1s property. By allowing the molecules to interact for 664 μs at a distance of 1. circuit. Thus, two-qubit gates, such as a cross-resonance gate or an i swap gate, can be realized without a detrimental effect from the static Z Z interaction. How can the SWAP operation be realized using the iSWAP gate? quantum-gate; circuit-construction; Share. The reason, in part, is the existing framework for tunable couplers based on the dispersive May 21, 2024 · removal via adiabatic gate (DRAG) pulse [12, 18, 19]. Applying these techniques to our fluxonium processor, we show that replacing the iSWAP gate by its square root SQiSW leads to a significant performance boost at almost no Users will be able to operate these higher fidelity and universal iSWAP gates for a wide range of algorithmic research, with a median gate time of 72 nanoseconds. extensions import UnitaryGate def U_theta(theta): arr = cirq. operations. 0 International license. 99$\%$ and a short gate time of about 24 ns. Bases: qiskit. Note that these Quantum Circuit¶. However, evolution time needs to be controlled accurately and the atomic level configuration is a little complex. However, Then, two distinct transitions of the nuclear spin are addressed to measure the phase of an iSWAP quantum gate. ? How could a $\\sqrt{SWAP}$ circuit be expressed in terms of CNOT gates & single qubit rotations? CNOT & $\\sqrt{SWAP}$ Gates Any quantum circuit can be simulated to an arbitrary degree of Secondly, an entangling Clifford group two-qubit gate, such as iSWAP or CZ, would be more helpful to compare the performance of our device with other two-qubit gate implementations. A deterministic single-photon two-qubit SWAP gate between polarization and spatial-momentum is demonstrated on a silicon chip. We found that the fidelity of generated Bell states is presently limited by the thermal motion Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site A quantum instruction set is where quantum hardware and software meet. The availabiltiy of an entangling two-qubit gate is essential for quantum com-puting because in combination with single-qubit gates arbitrary multi-qubit operations can be performed [26]. 23 %, respectively, which are close to their T 1 limits. The proposed architecture can also be scaled up to multiqubit cases. Besides idling, an extra phase may also accumulate during the period of frequency Enhancements across the technology stack include a new cryogenic hardware design, an overhaul of the qubit circuit layout, precise qubit frequency targeting with Alternating-Bias Assisted Annealing, and flexible gate architecture with precise controls. Once parameters are identified that more closely resemble the actual Entanglement and iSWAP gate between molecular qubits Article 13 November 2024 Power-optimal, stabilized entangling gate between trapped-ion qubits Id like to decompose root iswap gate into root cz (not cz or cx) and single-qubit gates. We show that these native two-qubit gates are better than their counterparts compiled from cross-resonance gates. twhwppzjlmlyilxhieleyltjqkicvoxjttgxlnopjkrhpksmnn