Qubit Decoherence and Symmetry Restoration through Real-Time Instantons
- URL: http://arxiv.org/abs/2111.10433v1
- Date: Fri, 19 Nov 2021 20:53:32 GMT
- Title: Qubit Decoherence and Symmetry Restoration through Real-Time Instantons
- Authors: Foster Thompson and Alex Kamenev
- Abstract summary: We show that non-perturbative quantum effects lead to the symmetry restoration and result in exponentially small but finite qubit decoherence rate.
Technically the symmetry restoration is due to real time instanton trajectories of the Keldysh path integral.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: A parametrically driven quantum oscillator, stabilized by a nonlinear
dissipation, exhibits a spontaneous breaking of the parity symmetry. It results
in the quantum bi-stability, corresponding to a Bloch sphere of dark states.
This makes such a driven-dissipative system an attractive candidate for a
qubit. The parity symmetry breaking is exact both on the classical level and
within the quantum mechanical perturbation theory. Here we show that
non-perturbative quantum effects lead to the symmetry restoration and result in
exponentially small but finite qubit decoherence rate. Technically the symmetry
restoration is due to real time instanton trajectories of the Keldysh path
integral, which represents the Lindbladian evolution of the driven-dissipative
oscillator.
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