Published March 27, 2019 | Version v1
Publication

Decoherence as a Signature of an Excited State Quantum Phase Transition in Two Level Boson Systems

Citation

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Description

We analyze the decoherence induced on a single qubit by the interaction with a two-level boson system with critical internal dynamics. We explore how the decoherence process is affected by the presence of quantum phase transitions in the environment. We conclude that the dynamics of the qubit changes dramatically when the environment passes through a continuous excited state quantum phase transition. If the system-environment coupling energy equals the energy at which the environment has a critical behavior, the decoherence induced on the qubit is maximal and the fidelity tends to zero with finite size scaling obeying a power-law.

Abstract

Ministerio de Educación y Ciencia FIS2006-12783-C03-01, FPA2007-63074, FIS2008-04189, CSD2007-00042

Abstract

Comunidad de Madrid y CSIC 200650M012

Abstract

Junta de Andalucia FQM160, FQM318, P05-FQM437, P07-FQM-02962

Additional details

Created:
March 27, 2023
Modified:
November 28, 2023