Ladder of Loschmidt anomalies in the deep strong-coupling regime of a qubit-oscillator system

• URL: http://arxiv.org/abs/2107.10432v2
• Date: Sat, 30 Oct 2021 23:43:36 GMT
• Title: Ladder of Loschmidt anomalies in the deep strong-coupling regime of a qubit-oscillator system
• Authors: J. M. Betancourt, F. J. Rodr\'iguez, L. Quiroga and N. F. Johnson
• Abstract summary: We find regular structures within the deep strong-coupling limit of qubit-oscillator systems. The key feature whereby the initial state collapses into singularity states at select values of the interaction strength and select times may be used to enhance - or attack - quantum information processing schemes.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We uncover a remarkably regular array of singularity-like structures within the deep strong-coupling limit of qubit-oscillator (e.g. light-matter) systems described by the quantum Rabi model, as a function of time and coupling strength. These non-analytic anomalies in the Loschmidt amplitude (echoes) suggest the existence of new forms of dynamical phase transition within this deep strong-coupling regime. The key feature whereby the initial state collapses into orthogonal states at select values of the interaction strength and select times, may be used to enhance - or attack - quantum information processing or computation schemes that rely on removing - or retaining - a given quantum state.

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