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QI: Fachverband Quanteninformation

QI 13: Implementations: Superconducting Qubits

QI 13.6: Vortrag

Freitag, 9. September 2022, 11:15–11:30, H8

Coupler-mediated unconditional reset of fixed-frequency superconducting qubits — •Gerhard Huber^1,2, Federico Roy^1,2, and Stefan Filipp^1,2,3 — ¹Walther-Meißner-Institut, Bayrische Akademie der Wissenschaften, 85748 Garching, Germany — ²Physik-Department, Technische Universität München, 85748 Garching, Germany — ³Munich Center for Quantum Science and Technology (MCQST), 80799 München, Germany

Advances in superconducting qubit fabrication procedures have led to energy relaxation times regularly exceeding 100 µ s. Therefore, passive reset via relaxation has become unpractical, and an active reset protocol is required to achieve high repetition rate of quantum algorithms. Previous unconditional qubit reset schemes have relied on flux tunable qubits or multiple transitions over higher qubit states. We extend a previous reset scheme using flux tunable qubits to fixed frequency transmon qubits with tunable couplers. The reset pulse consists of a single parametric flux pulse on the coupler to transfer qubit excitations to a quickly decaying resonator. Our protocol does not rely on additional control lines and can be implemented on current multi-qubit architectures. Further, it can be extended to architectures where a single coupler allows for reset of multiple qubits. We present preliminary numerical and experimental results for this reset protocol demonstrating its potential usefulness.