Nonunitary geometric phases: A qubit coupled to an environment with random noise

We describe the decoherence process induced on a two-level quantum system in direct interaction with a nonequilibrium environment. The nonequilibrium feature is represented by a nonstationary random function corresponding to the fluctuating transition frequency between two quantum states coupled to...

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Autores principales:	Lombardo, F.C., Villar, P.I.
Formato:	JOUR
Materias:	Decoherence effects Decoherence process Decoherence time scale Direct interactions Random functions Standard procedures Thermal environment Transition frequencies Quantum computers Quantum electronics Quantum optics
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_10502947_v87_n3_p_Lombardo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_10502947_v87_n3_p_Lombardo
record_format	dspace
spelling	todo:paper_10502947_v87_n3_p_Lombardo2023-10-03T16:00:15Z Nonunitary geometric phases: A qubit coupled to an environment with random noise Lombardo, F.C. Villar, P.I. Decoherence effects Decoherence process Decoherence time scale Direct interactions Random functions Standard procedures Thermal environment Transition frequencies Quantum computers Quantum electronics Quantum optics We describe the decoherence process induced on a two-level quantum system in direct interaction with a nonequilibrium environment. The nonequilibrium feature is represented by a nonstationary random function corresponding to the fluctuating transition frequency between two quantum states coupled to the surroundings. In this framework, we compute the decoherence factors which have a characteristic "dip" related to the initial phases of the bath modes. We therefore study different types of environments, namely, ohmic and supraohmic. These environments present different decoherence time scales than the thermal environment we used to study. As a consequence, we compute analytically and numerically the nonunitary geometric phase for the qubit in a quasicyclic evolution under the presence of these particular nonequilibrium environments. We show in which cases decoherence effects could, in principle, be controlled in order to perform a measurement of the geometric phase using standard procedures. © 2013 American Physical Society. Fil:Lombardo, F.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Villar, P.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10502947_v87_n3_p_Lombardo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Decoherence effects Decoherence process Decoherence time scale Direct interactions Random functions Standard procedures Thermal environment Transition frequencies Quantum computers Quantum electronics Quantum optics
spellingShingle	Decoherence effects Decoherence process Decoherence time scale Direct interactions Random functions Standard procedures Thermal environment Transition frequencies Quantum computers Quantum electronics Quantum optics Lombardo, F.C. Villar, P.I. Nonunitary geometric phases: A qubit coupled to an environment with random noise
topic_facet	Decoherence effects Decoherence process Decoherence time scale Direct interactions Random functions Standard procedures Thermal environment Transition frequencies Quantum computers Quantum electronics Quantum optics
description	We describe the decoherence process induced on a two-level quantum system in direct interaction with a nonequilibrium environment. The nonequilibrium feature is represented by a nonstationary random function corresponding to the fluctuating transition frequency between two quantum states coupled to the surroundings. In this framework, we compute the decoherence factors which have a characteristic "dip" related to the initial phases of the bath modes. We therefore study different types of environments, namely, ohmic and supraohmic. These environments present different decoherence time scales than the thermal environment we used to study. As a consequence, we compute analytically and numerically the nonunitary geometric phase for the qubit in a quasicyclic evolution under the presence of these particular nonequilibrium environments. We show in which cases decoherence effects could, in principle, be controlled in order to perform a measurement of the geometric phase using standard procedures. © 2013 American Physical Society.
format	JOUR
author	Lombardo, F.C. Villar, P.I.
author_facet	Lombardo, F.C. Villar, P.I.
author_sort	Lombardo, F.C.
title	Nonunitary geometric phases: A qubit coupled to an environment with random noise
title_short	Nonunitary geometric phases: A qubit coupled to an environment with random noise
title_full	Nonunitary geometric phases: A qubit coupled to an environment with random noise
title_fullStr	Nonunitary geometric phases: A qubit coupled to an environment with random noise
title_full_unstemmed	Nonunitary geometric phases: A qubit coupled to an environment with random noise
title_sort	nonunitary geometric phases: a qubit coupled to an environment with random noise
url	http://hdl.handle.net/20.500.12110/paper_10502947_v87_n3_p_Lombardo
work_keys_str_mv	AT lombardofc nonunitarygeometricphasesaqubitcoupledtoanenvironmentwithrandomnoise AT villarpi nonunitarygeometricphasesaqubitcoupledtoanenvironmentwithrandomnoise
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Nonunitary geometric phases: A qubit coupled to an environment with random noise

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