Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 40: Poster: Quantum Computation: Hardware Platforms

FM 40.1: Poster

Dienstag, 24. September 2019, 16:30–18:30, Tents

Tunable refrigerator for superconducting quantum circuits — •Hao Hsu and Gianluigi Catelani — Forschungszentrum Jülich, Jülich, Germany

Fast initialization with high reset fidelity is a necessary criterion for realizing quantum computing. Recently, a “quantum circuit refrigerator” (QCR) was demonstrated which can cool superconducting resonators [1]. Here we extend the theory [2] to study a QCR coupled to generic superconducting circuits. We identify two working temperature regimes, depending on the QCR electron temperature T_N: the thermal activation regime and the low-temperature regime. In the thermal activation regime, the effective temperature T_T at which the circuit is cooled is proportional to T_N, while T_T is independent of T_N in the low-temperature regime. In typical transmon and capacitively shunted flux qubits, we find that in both regimes, the effective temperature limits the reset fidelity. In the practically relevant low-temperature regime, we predict 99.99 % reset fidelity in a reset time of few tens of nanoseconds.

[1] K. Y. Tan et.al., Nat. Commun. 8 15189 (2017) [2] M. Silveri et.al., Phys. Rev. B 96, 094524 (2017)