Fast ZZ-Free Entangling Gates for Superconducting Qubits Assisted by a Driven Resonator

Abstract

Engineering high-fidelity two-qubit gates is an indispensable step toward practical quantum computing. For superconducting quantum platforms, one important setback is the stray interaction between qubits, which causes significant coherent errors. For transmon qubits, protocols for mitigating such errors usually involve fine-tuning the hardware parameters or introducing usually noisy flux-tunable couplers. In this work, we propose a simple scheme to cancel these stray interactions. The coupler used for such cancellation is a driven high-coherence resonator, where the amplitude and frequency of the drive serve as control knobs. Through the resonator-induced-phase (RIP) interaction, the static ZZ coupling can be entirely neutralized. We numerically show that such a scheme can enable short and high-fidelity entangling gates, including cross-resonance CNOT gates within 40 ns and adiabatic CZ gates within 140 ns. Our architecture is not only ZZ free but also contains no extra noisy components, such that it preserves the coherence times of fixed-frequency transmon qubits. With the state-of-the-art coherence times, the error of our cross-resonance CNOT gate can be reduced to below 1e-4.

References in corpus (15)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Charge insensitive qubit design derived from the Cooper pair box
• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
• Analytic control methods for high fidelity unitary operations in a weakly nonlinear oscillator
• Microwave-induced coupling of superconducting qubits
• Tunable coupling in circuit quantum electrodynamics with a superconducting V-system
• Systematic Improvements in Transmon Qubit Coherence Enabled by Niobium Surface Encapsulation
• Moving beyond the transmon: Noise-protected superconducting quantum circuits
• Operation and intrinsic error budget of a two-qubit cross-resonance gate
• Optimized pulse shapes for a resonator-induced phase gate
• Mitigation of interfacial dielectric loss in aluminum-on-silicon superconducting qubits
• Native two-qubit gates in fixed-coupling, fixed-frequency transmons beyond cross-resonance interaction
• Alternating Bias Assisted Annealing of Amorphous Oxide Tunnel Junctions

Cited by in corpus (5)

• Globally driven superconducting quantum computing architecture
• Efficient Frequency Allocation for Superconducting Quantum Processors Using Improved Optimization Techniques
• Microwave-activated high-fidelity three-qubit gate scheme for fixed-frequency superconducting qubits
• Review of Superconducting Qubit Devices and Their Large-Scale Integration
• Systematic Construction of Time-Dependent Hamiltonians for Microwave-Driven Josephson Circuits