Scalable Method for Eliminating Residual $ZZ$ Interaction between Superconducting Qubits

Abstract

Unwanted $ZZ$ interaction is a quantum-mechanical crosstalk phenomenon which correlates qubit dynamics and is ubiquitous in superconducting qubit systems. It adversely affects the quality of quantum operations and can be detrimental in scalable quantum information processing. Here we propose and experimentally demonstrate a practically extensible approach for complete cancellation of residual $ZZ$ interaction between fixed-frequency transmon qubits, which are known for long coherence and simple control. We apply to the intermediate coupler that connects the qubits a weak microwave drive at a properly chosen frequency in order to noninvasively induce an ac Stark shift for $ZZ$ cancellation. We verify the cancellation performance by measuring vanishing two-qubit entangling phases and $ZZ$ correlations. In addition, we implement a randomized benchmarking experiment to extract the idling gate fidelity which shows good agreement with the coherence limit, demonstrating the effectiveness of $ZZ$ cancellation. Our method allows independent addressability of each qubit-qubit connection, and is applicable to both nontunable and tunable couplers, promising better compatibility with future large-scale quantum processors.

Main text: 6 pages, 4 figures; Supplement: 7 pages, 6 figures

References in corpus (24)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Charge insensitive qubit design derived from the Cooper pair box
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Superconducting qubit in waveguide cavity with coherence time approaching 0.1ms
• Exponential suppression of bit or phase flip errors with repetitive error correction
• Black-box superconducting circuit quantization
• High-fidelity, high-scalability two-qubit gate scheme for superconducting qubits
• Tunable Coupling Architecture for Fixed-frequency Transmons
• Demonstration of a High-Fidelity CNOT for Fixed-Frequency Transmons with Engineered ZZ Suppression
• Implementation of Conditional-Phase Gates based on tunable ZZ-Interactions
• Reducing unitary and spectator errors in cross resonance with optimized rotary echoes
• Suppression of Unwanted $ZZ$ Interactions in a Hybrid Two-Qubit System
• High-contrast ZZ interaction using superconducting qubits with opposite-sign anharmonicity
• Parametric-resonance entangling gates with a tunable coupler
• Hardware-Efficient Microwave-Activated Tunable Coupling Between Superconducting Qubits
• Benchmarking Coherent Errors in Controlled-Phase Gates due to Spectator Qubits
• Fast parametric two-qubit gates with suppressed residual interaction using a parity-violated superconducting qubit
• Analyzing the Performance of Variational Quantum Factoring on a Superconducting Quantum Processor
• Suppression of static ZZ interaction in an all-transmon quantum processor
• Coupler-Assisted Controlled-Phase Gate with Enhanced Adiabaticity
• Perturbation impact of spectators on a cross-resonance gate in a tunable coupling superconducting circuit
• ZZ freedom in two qubit gates
• Superrobust Geometric Control of a Superconducting Circuit
• Superconducting qubits beyond the dispersive regime

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• A Practical Introduction to Benchmarking and Characterization of Quantum Computers
• All-microwave manipulation of superconducting qubits with a fixed-frequency transmon coupler
• An error-protected cross-resonance switch in weakly-tuneable architectures
• Benchmarking quantum logic operations relative to thresholds for fault tolerance
• Role of parasitic interactions and microwave crosstalk in dispersive control of two superconducting artificial atoms
• Autonomous Stabilization of Fock States in an Oscillator against Multiphoton Losses
• Globally driven superconducting quantum computing architecture
• Parity-dependent state transfer for direct entanglement generation
• Collateral coupling between superconducting resonators: Fast and high fidelity generation of qudit-qudit entanglement
• Determination of Molecular Energies via Quantum Imaginary Time Evolution in a Superconducting Qubit System
• Scalable protocol to mitigate $ZZ$ crosstalk in universal quantum gates
• Telegraph flux noise induced beating Ramsey fringe in transmon qubits
• In situ mixer calibration for superconducting quantum circuits
• Noise tailoring for Robust Amplitude Estimation
• Scalable quantum eraser for superconducting integrated circuits
• Redundant string symmetry-based error correction: Demonstrations on quantum devices
• Robust implicit quantum control of interacting spin chains
• Concurrent Fermionic Simulation Gate
• Parity Cross-Resonance: A Multiqubit Gate
• Blind-spots of Randomized Benchmarking Under Temporal Correlations