An error-protected cross-resonance switch in weakly-tuneable architectures
arXiv:2212.05519 · doi:10.1103/PhysRevApplied.19.024057
Abstract
In two-qubit gates activated by microwave pulses, by turning pulse on or off, the state of qubits are swapped between entangled or idle modes. In either mode, the presence of stray couplings makes qubits accumulate coherent phase error. However, the error rates in the two modes differ because qubits carry different stray coupling strengths in each mode; therefore, eliminating stray coupling from one mode does not remove it from the other. We propose to combine such a gate with a tunable coupler and show that both idle and entangled qubits can become free from stray couplings. This significantly increases the operational switch fidelity in quantum algorithms. We further propose a weakly-tunable qubit as an optimum coupler to bring the two modes parametrically near each other. This remarkably enhances the tuning process by reducing its leakage.
arXiv comment17 pages, 16 figures. arXiv admin note: substantial text overlap with arXiv:2202.05208
References in corpus (43)
- Quantum Computing in the NISQ era and beyond
- Supplementary information for "Quantum supremacy using a programmable superconducting processor"
- Noisy intermediate-scale quantum (NISQ) algorithms
- Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
- Strong quantum computational advantage using a superconducting quantum processor
- Schrieffer-Wolff transformation for quantum many-body systems
- Efficient Z-Gates for Quantum Computing
- Quantum advantage in learning from experiments
- Fast universal quantum control above the fault-tolerance threshold in silicon
- Procedure for systematically tuning up crosstalk in the cross resonance gate
- A tunable coupling scheme for implementing high-fidelity two-qubit gates
- Exponential suppression of bit or phase flip errors with repetitive error correction
- Demonstrating a Continuous Set of Two-qubit Gates for Near-term Quantum Algorithms
- Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
- Hot non-equilibrium quasiparticles in transmon qubits
- High-fidelity, high-scalability two-qubit gate scheme for superconducting qubits
- Effective Hamiltonian models of the cross-resonance gate
- Tunable Superconducting Qubits with Flux-Independent Coherence
- Demonstration of a High-Fidelity CNOT for Fixed-Frequency Transmons with Engineered ZZ Suppression
- Implementation of Conditional-Phase Gates based on tunable ZZ-Interactions
- First-principles analysis of cross-resonance gate operation
- Fault-Tolerant Logical Gates in the IBM Quantum Experience
- High fidelity two-qubit gates on fluxoniums using a tunable coupler
- Suppression of Unwanted Interactions in a Hybrid Two-Qubit System
- Quantum crosstalk analysis for simultaneous gate operations on superconducting qubits
- High-fidelity three-qubit iToffoli gate for fixed-frequency superconducting qubits
- Analytical modeling of parametrically-modulated transmon qubits
- High-contrast ZZ interaction using superconducting qubits with opposite-sign anharmonicity
- Parametric-resonance entangling gates with a tunable coupler
- Charting the circuit QED design landscape using optimal control theory
- Benchmarking Coherent Errors in Controlled-Phase Gates due to Spectator Qubits
- Demonstration of an All-Microwave Controlled-Phase Gate between Far Detuned Qubits
- Scalable Method for Eliminating Residual Interaction between Superconducting Qubits
- Perturbation impact of spectators on a cross-resonance gate in a tunable coupling superconducting circuit
- ZZ freedom in two qubit gates
- Single Shot i-Toffoli Gate in Dispersively Coupled Superconducting Qubits
- Dynamics of parametric fluctuations induced by quasiparticle tunneling in superconducting flux qubits
- Superconducting qubits beyond the dispersive regime
- Exact quantization of superconducting circuits
- Weakly Flux-Tunable Superconducting Qubit
- Noise and microresonance of critical current in Josephson junction induced by Kondo trap states
- Rate of tunneling nonequilibrium quasiparticles in superconducting qubits
- Non-perturbative analytical diagonalization of Hamiltonians with application to coupling suppression and enhancement in cQED
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- Fast ZZ-Free Entangling Gates for Superconducting Qubits Assisted by a Driven Resonator
- Lattice Hamiltonians and Stray Interactions Within Quantum Processors
- Error mitigation of entangled states using brainbox quantum autoencoders
- Concurrent Fermionic Simulation Gate
- Parity Cross-Resonance: A Multiqubit Gate