Journal
APPLIED PHYSICS LETTERS
Volume 121, Issue 23, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0129345
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Funding
- European Research Council [681311, 957440, 101053801]
- European Commission [820505]
- Business Finland [41419/31/2020]
- Academy of Finland through its Centers of Excellence Program [312300, 336810]
- Research Impact Foundation
- European Research Council (ERC) [101053801, 957440] Funding Source: European Research Council (ERC)
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In this research, the authors present their recent results on a qubit reset scheme based on a quantum-circuit refrigerator. They use photon-assisted quasiparticle tunneling to decrease the energy relaxation time of the qubit during operation. The experiment involves a transmon qubit with dispersive readout, and the reset is achieved through capacitively coupling the qubit to the quantum-circuit refrigerator.
We present here our recent results on qubit reset scheme based on a quantum-circuit refrigerator (QCR). In particular, we use the photon-assisted quasiparticle tunneling through a superconductor-insulator-normal-metal-insulator-superconductor junction to controllably decrease the energy relaxation time of the qubit during the QCR operation. In our experiment, we use a transmon qubit with dispersive readout. The QCR is capacitively coupled to the qubit through its normal-metal island. We employ rapid, square-shaped QCR control voltage pulses with durations in the range of 2-350 ns and a variety of amplitudes to optimize the reset time and fidelity. Consequently, we reach a qubit ground-state probability of roughly 97% with 80-ns pulses starting from the first excited state. The qubit state probability is extracted from averaged readout signal, where the calibration is based on Rabi oscillations, thus not distinguishing the residual thermal population of the qubit. (C) 2022 Author(s).
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