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 (61)

• 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
• Circuit Quantum Electrodynamics
• Superconducting Qubits: Current State of Play
• Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
• Shortcuts to adiabaticity: concepts, methods, and applications
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• 1/f noise: implications for solid-state quantum information
• New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
• Procedure for systematically tuning up crosstalk in the cross resonance gate
• A simple all-microwave entangling gate for fixed-frequency superconducting qubits
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
• A tunable coupling scheme for implementing high-fidelity two-qubit gates
• Transmon qubit with relaxation time exceeding 0.5 milliseconds
• A universal gate for fixed-frequency qubits via a tunable bus
• Demonstration of Universal Parametric Entangling Gates on a Multi-Qubit Lattice
• Analytic control methods for high fidelity unitary operations in a weakly nonlinear oscillator
• Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
• Suppression of Qubit Crosstalk in a Tunable Coupling Superconducting Circuit
• Measurement-induced state transitions in a superconducting qubit: Beyond the rotating wave approximation
• Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
• 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
• Three-dimensional superconducting resonators at $T<20$ mK with the photon lifetime up to $\tau =2$ seconds
• Microwave-induced coupling of superconducting qubits
• Tunable Coupling Architecture for Fixed-frequency Transmons
• Demonstration of a High-Fidelity CNOT for Fixed-Frequency Transmons with Engineered ZZ Suppression
• Fault-tolerant detection of a quantum error
• Tunable coupling in circuit quantum electrodynamics with a superconducting V-system
• Experimental demonstration of a resonator-induced phase gate in a multi-qubit circuit QED system
• Reducing unitary and spectator errors in cross resonance with optimized rotary echoes
• Systematic Improvements in Transmon Qubit Coherence Enabled by Niobium Surface Encapsulation
• Suppression of Unwanted $ZZ$ Interactions in a Hybrid Two-Qubit System
• Moving beyond the transmon: Noise-protected superconducting quantum circuits
• Selective darkening of degenerate transitions demonstrated with two superconducting quantum bits
• Tunable coupler for realizing a controlled-phase gate with dynamically decoupled regime in a superconducting circuit
• Operation and intrinsic error budget of a two-qubit cross-resonance gate
• Superconducting cavity qubit with tens of milliseconds single-photon coherence time
• Dynamics of Transmon Ionization
• Scqubits: a Python package for superconducting qubits
• Quantum crosstalk cancellation for fast entangling gates and improved multi-qubit performance
• Hardware-Efficient Microwave-Activated Tunable Coupling Between Superconducting Qubits
• Floating tunable coupler for scalable quantum computing architectures
• Optimized pulse shapes for a resonator-induced phase gate
• Engineering bilinear mode coupling in circuit QED: Theory and experiment
• Universal fidelity reduction of quantum operations from weak dissipation
• Engineering Dynamical Sweet Spots to Protect Qubits from 1/$f$ Noise
• Programmable Heisenberg interactions between Floquet qubits
• High-fidelity parametric beamsplitting with a parity-protected converter
• High-fidelity resonator-induced phase gate with single-mode squeezing
• Mitigation of interfacial dielectric loss in aluminum-on-silicon superconducting qubits
• Tunable inductive coupling of superconducting qubits in the strongly nonlinear regime
• Engineering, control and longitudinal readout of Floquet qubits
• Selective darkening of degenerate transitions for implementing quantum controlled-NOT gates
• Native two-qubit gates in fixed-coupling, fixed-frequency transmons beyond cross-resonance interaction
• Alternating Bias Assisted Annealing of Amorphous Oxide Tunnel Junctions
• Optimization of the resonator-induced phase gate for superconducting qubits
• An error-protected cross-resonance switch in weakly-tuneable architectures
• Completely Positive Map for Noisy Driven Quantum Systems Derived by Keldysh Expansion

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