Stabilization of Kerr-cat qubits with quantum circuit refrigerator

• URL: http://arxiv.org/abs/2406.13957v2
• Date: Sat, 01 Feb 2025 04:55:37 GMT
• Title: Stabilization of Kerr-cat qubits with quantum circuit refrigerator
• Authors: Shumpei Masuda, Shunsuke Kamimura, Tsuyoshi Yamamoto, Takaaki Aoki, Akiyoshi Tomonaga,
• Abstract summary: We study on-chip refrigeration for Kerr-cat qubits based on photon-assisted electron tunneling at tunneling junctions.<n>Rates of QCR-induced deexcitations of the system can be changed by more than four orders of magnitude.<n>QCR can serve as a tunable dissipation source which stabilizes Kerr-cat qubits.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A periodically-driven superconducting nonlinear resonator can implement a Kerr-cat qubit, which provides a promising route to a quantum computer with a long lifetime. However, the system is vulnerable to pure dephasing, which causes unwanted excitations outside the qubit subspace. Therefore, we require a refrigeration technology which confines the system in the qubit subspace. We theoretically study on-chip refrigeration for Kerr-cat qubits based on photon-assisted electron tunneling at tunneling junctions, called quantum circuit refrigerator (QCR). Rates of QCR-induced deexcitations of the system can be changed by more than four orders of magnitude by tuning a bias voltage across the tunneling junctions. Unwanted QCR-induced bit flips are greatly suppressed due to quantum interference in the tunneling process, and thus the long lifetime is preserved. The QCR can serve as a tunable dissipation source which stabilizes Kerr-cat qubits.

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