Decoherence as a signature of an excited-state quantum phase transition
نویسندگان
چکیده
A. Relaño,* J. M. Arias, J. Dukelsky, J. E. García-Ramos, and P. Pérez-Fernández Instituto de Estructura de la Materia, CSIC, Serrano 123, E-28006 Madrid, Spain Departamento de Física Atómica, Molecular y Nuclear, Facultad de Física, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain Departamento de Física Aplicada, Universidad de Huelva, 21071 Huelva, Spain Received 18 June 2008; published 16 December 2008
منابع مشابه
Connection between decoherence and excited state quantum phase transitions
In this work we explore the relationship between an excited state quantum phase transition (ESQPT) and the phenomenon of quantum decoherence. For this purpose, we study how the decoherence is affected by the presence of a continuous ESQPT in the environment. This one is modeled as a two level boson system described by a Lipkin Hamiltonian. We will show that the decoherence of the system is maxi...
متن کاملDecoherence effects on quantum Fisher information of multi-qubit W states
Quantum fisher information of a parameter characterizing the sensitivity of a state with respect to parameter changes. In this paper, we study the quantum fisher information of the W state for four, five, six and seven particles in decoherence channels, such as amplitude damping, phase damping and depolarizing channel. Using Krauss operators for decoherence channels components, we investigate t...
متن کاملDecoherence due to an excited-state quantum phase transition in a two-level boson model
P. Pérez-Fernández, A. Relaño,* J. M. Arias, J. Dukelsky, and J. E. García-Ramos Departamento de Física Atómica, Molecular y Nuclear, Facultad de Física, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain Instituto de Estructura de la Materia, CSIC, Serrano 123, E-28006 Madrid, Spain Departamento de Física Aplicada, Universidad de Huelva, 21071 Huelva, Spain Received 3 July 2009; publi...
متن کاملTeleportation via an Entangled Coherent Channel and Decoherence Effect on This Channel
We study an entangled two-mode coherent state within the framework of2×2-dimensional Hilbert space. We investigate the problem of quantum teleportation ofa superposition coherent state via an entangled coherent channel. By three differentmeasures with the titles ``minimum assured fidelity (MASF)”, ``average teleportationfidelity” and ``optimal fidelity (f)” we study the ...
متن کاملControlling the Decoherence of a “Meter” via Stroboscopic Feedback
Decoherence is the rapid destruction of the phase relation between two quantum states of a system caused by the entanglement of these two states with two different states of the environment [1]. The progressive decoherence of a mesoscopic Schrödinger cat has been observed for the first time in the experiment of Brune et al. [2], where the linear superposition of two coherent states of the elect...
متن کامل