Rapid and Unconditional Parametric Reset Protocol for Tunable Superconducting Qubits

Abstract

Qubit initialization is a critical task in quantum computation and communication. Extensive efforts have been made to achieve this with high speed, efficiency and scalability. However, previous approaches have either been measurement-based and required fast feedback, suffered from crosstalk or required sophisticated calibration. Here, we report a fast and high-fidelity reset scheme, avoiding the issues above without any additional chip architecture. By modulating the flux through a transmon qubit, we realize a swap between the qubit and its readout resonator that suppresses the excited state population to 0.08% $\pm$ 0.08% within 34 ns (284 ns if photon depletion of the resonator is required). Furthermore, our approach (i) can achieve effective second excited state depletion, (ii) has negligible effects on neighbouring qubits, and (iii) offers a way to entangle the qubit with an itinerant single photon, useful in quantum communication applications.

38 pages, 15 figures

References in corpus (18)

• Charge insensitive qubit design derived from the Cooper pair box
• Surface codes: Towards practical large-scale quantum computation
• Superconducting qubit in waveguide cavity with coherence time approaching 0.1ms
• Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit
• Quantum harmonic oscillator state synthesis by reservoir engineering
• Demonstrating a Driven Reset Protocol of a Superconducting Qubit
• Coherence and Decay of Higher Energy Levels of a Superconducting Transmon Qubit
• Deterministic multi-qubit entanglement in a quantum network
• Feedback control of a solid-state qubit using high-fidelity projective measurement
• Thermal and Residual Excited-State Population in a 3D Transmon Qubit
• Initialization by measurement of a two-qubit superconducting circuit
• Universal stabilization of a parametrically coupled qubit
• Removing leakage-induced correlated errors in superconducting quantum error correction
• Measurement-induced qubit state mixing in circuit QED from up-converted dephasing noise
• First-order sidebands in circuit QED using qubit frequency modulation
• Microwave-Induced Amplitude and Phase Tunable Qubit-Resonator Coupling in Circuit Quantum Electrodynamics
• Optimization of infrared and magnetic shielding of superconducting TiN and Al coplanar microwave resonators
• Exploiting dynamic quantum circuits in a quantum algorithm with superconducting qubits

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• Coupler-Assisted Controlled-Phase Gate with Enhanced Adiabaticity
• Shortcuts to Adiabaticity for Open Systems in Circuit Quantum Electrodynamics
• Universal KPZ scaling in noisy hybrid quantum circuits
• Recent Developments in Quantum-Circuit Refrigeration
• A quantum collisional classifier driven by information reservoir
• Exceptional-point-assisted entanglement, squeezing, and reset in a chain of three superconducting resonators
• Shortcuts to Adiabaticity for Fast Qubit Readout in Circuit Quantum Electrodynamics
• Exploiting Different Levels of Parallelism in the Quantum Control Microarchitecture for Superconducting Qubits
• Spontaneous decay of artificial atoms in a three-qubit system