Decoherence as a signature of an excited-state quantum phase transition

2008/12/16 by A. Relano, A. Relaño, J. M. Arias +5 · 3 citations
Computer Science · Physics and Astronomy · #Charge qubit #Excited state #Phase qubit #Phase transition #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum decoherence #Quantum dissipation #Quantum mechanics #Quantum phase transition #Qubit #Spectroscopy and Quantum Chemical Studies #nucl-th #quant-ph

paper · pdf · doi:10.1103/physreva.78.060102

published as Phys.Rev.A78:060102,2009

openalex publication_date 2008/12/16 · arxiv created 2010/01/03 · arxiv updated 2015/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

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.

Citations

• Decay of Loschmidt Echo Enhanced by Quantum Criticality
• Dynamical Quantum Phase Transitions in the Dissipative Lipkin-Meshkov-Glick Model with Proposed Realization in Optical Cavity QED
• Two-level interacting boson models beyond the mean field
• Movimientos campesinos en Francia: la Provenza
• Decoherence, einselection, and the quantum origins of the classical

Cited by

• Decoherence due to an excited-state quantum phase transition in a two-level boson model
• Delocalization and quantum chaos in atom-field systems
• Impact of chaos on precursors of quantum criticality