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

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...

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Bibliographic Details
Main Authors: Garcia-Ramos, J E, Arias, J M, Dukelsky, J, Perez-Fernandez, P, Relano, A
Format: Conference Proceeding
Language:English
Subjects:
BOSONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COUPLING
ENERGY LEVELS
EXCITED STATES
INFORMATION
INTERACTING BOSON MODEL
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEAR STRUCTURE
PHASE TRANSFORMATIONS
QUANTUM DECOHERENCE
QUANTUM INFORMATION
QUBITS
SHELL MODELS
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Summary: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.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3232073