Parametric-resonance entangling gates with a tunable coupler

Abstract

High-fidelity parametric gates have been demonstrated with superconducting qubits via rf flux modulation of the qubit frequency. The modulation however leads to renormalization of the bare qubit-qubit coupling, thereby reducing the gate speed. Here, we realize a parametric-resonance gate, which is activated by bringing the average frequency of the modulated qubit in resonance with a static-frequency qubit while approximately retaining the bare qubit-qubit coupling. The activation of parametric-resonance gates does not depend on the frequency of modulation, allowing us to choose the modulation frequencies and avoid frequency collisions. Moreover, we show that this approach is compatible with tunable coupler architectures, which reduce always-on residual couplings. Using these techniques, we demonstrate iSWAP and CZ gates between two qubits coupled via a tunable coupler with average process fidelities as high as $99.3\%$ and $97.9\%$, respectively. The flexibility in activating parametric-resonance gates combined with a tunable coupler architecture provides a pathway for building large-scale quantum computers.

arXiv comment15 pages, 11 figures and one table. Published version

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• Universal fidelity reduction of quantum operations from weak dissipation
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• Coupler-Assisted Controlled-Phase Gate with Enhanced Adiabaticity
• Extensive characterization of a family of efficient three-qubit gates at the coherence limit
• Double-Transmon Coupler: Fast Two-Qubit Gate with No Residual Coupling for Highly Detuned Superconducting Qubits
• Modular tunable coupler for superconducting qubits
• Modular Superconducting Qubit Architecture with a Multi-chip Tunable Coupler
• Controlled-Controlled-Phase Gates for Superconducting Qubits Mediated by a Shared Tunable Coupler
• Coupler microwave-activated controlled phase gate on fluxonium qubits
• Nonlinearity and Parametric Amplification of Superconducting Nanowire Resonators in Magnetic Field
• Tunable Coupling Architectures with Capacitively Connecting Pads for Large-Scale Superconducting Multi-Qubit Processors
• Realization of fast all-microwave CZ gates with a tunable coupler
• Impact of decoherence on the fidelity of quantum gates leaving the computational subspace
• An error-protected cross-resonance switch in weakly-tuneable architectures
• High-precision pulse calibration of tunable couplers for high-fidelity two-qubit gates in superconducting quantum processors
• Fast parametric two-qubit gate for highly detuned fixed-frequency superconducting qubits using a double-transmon coupler
• Superconducting coupler with exponentially large on-off ratio
• Fast Flux Entangling Gate for Fluxonium Circuits
• Benchmarking quantum gates and circuits
• Tangling schedules eases hardware connectivity requirements for quantum error correction
• High-performance multiqubit system with double-transmon couplers: Toward scalable superconducting quantum computers
• Benchmarking Quantum Optimization for the Maximum-Cut Problem on a Superconducting Quantum Computer
• Floquet Analysis of Frequency Collisions
• Efficient two-qutrit gates in superconducting circuits using parametric coupling
• Characterization of drive-induced unwanted state transitions in superconducting circuits
• Hardware-Efficient Quantum Random Access Memory Design with a Native Gate Set on Superconducting Platforms
• Parametric multi-element coupling architecture for coherent and dissipative control of superconducting qubits
• In situ Qubit Frequency Tuning Circuit for Scalable Superconducting Quantum Computing: Scheme and Experiment
• Synchronization for Fault-Tolerant Quantum Computers
• Implementing High-fidelity Two-Qubit Gates in Superconducting Coupler Architecture with Novel Parameter Regions
• Fast microwave-driven two-qubit gates between fluxonium qubits with a transmon coupler
• Flexible Readout and Unconditional Reset for Superconducting Multi-Qubit Processors with Tunable Purcell Filters
• Parametric phase modulation in superconducting circuits
• Scalable quantum simulator with an extended gate set in giant atoms
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