Decoherence-free evolution of time-dependent superposition states of two-level systems and thermal effects

Journal Article · Fri Jul 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.012112· OSTI ID:22038595

Prado, F O; Duzzioni, E I ^[1]; Almeida, N G. de ^[2]; Moussa, M H. Y. ^[3]; Villas-Boas, C J ^[4]

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1. Universidade Federal de Uberlandia, Caixa Postal 593, 38400-902 Uberlandia, Minas Geraisn (Brazil)
2. Instituto de Fisica, Universidade Federal de Goias, 74001-970, Goiania, Goias (Brazil)
3. Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, Caixa Postal 369, 13560-970 Sao Carlos, Sao Paulo (Brazil)
4. Departamento de Fisica, Universidade Federal de Sao Carlos, P.O. Box 676, 13565-905 Sao Carlos, Sao Paulo (Brazil)

In this paper we detail some results advanced in a recent letter [Prado et al., Phys. Rev. Lett. 102, 073008 (2009).] showing how to engineer reservoirs for two-level systems at absolute zero by means of a time-dependent master equation leading to a nonstationary superposition equilibrium state. We also present a general recipe showing how to build nonadiabatic coherent evolutions of a fermionic system interacting with a bosonic mode and investigate the influence of thermal reservoirs at finite temperature on the fidelity of the protected superposition state. Our analytical results are supported by numerical analysis of the full Hamiltonian model.

• OSTI ID: 22038595
• Journal Information: Physical Review. A, Vol. 84, Issue 1; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
97 MATHEMATICAL METHODS AND COMPUTING
FERMIONS
HAMILTONIANS
NUMERICAL ANALYSIS
QUANTUM DECOHERENCE
QUANTUM STATES
TEMPERATURE DEPENDENCE
TIME DEPENDENCE