Decoherence as attenuation of mesoscopic echoes in a spin-chain channel

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.012310· OSTI ID:21440478

Alvarez, Gonzalo A ^[1]; Danieli, Ernesto P ^[2]; Levstein, Patricia R; Pastawski, Horacio M ^[3]

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1. Fakultaet Physik, Technische Universitaet Dortmund, D-44221 Dortmund (Germany)
2. ITMC, RWTH Aachen University, D-52074 Aachen (Germany)
3. Facultad de Matematica, Astronomia y Fisica and Instituto de Fisica Enrique Gaviola, Universidad Nacional de Cordoba, 5000 Cordoba (Argentina)

An initial local excitation in a confined quantum system evolves, exploring the whole system and returning to the initial position as a mesoscopic echo at the Heisenberg time. We consider two weakly coupled spin chains, a spin ladder, where one is a quantum channel while the other represents an environment. We quantify decoherence in the quantum channel through the attenuation of the mesoscopic echoes. We evaluate decoherence rates for different ratios between sources of amplitude fluctuation and dephasing in the interchain interaction Hamiltonian. The many-body dynamics is seen as a one-body evolution with a decoherence rate given by the Fermi golden rule.

• OSTI ID: 21440478
• Journal Information: Physical Review. A, Vol. 82, Issue 1; Other Information: DOI: 10.1103/PhysRevA.82.012310; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
ATTENUATION
EXCITATION
FLUCTUATIONS
HAMILTONIANS
MANY-BODY PROBLEM
QUANTUM DECOHERENCE
QUANTUM STATES
SPIN
ANGULAR MOMENTUM
ENERGY-LEVEL TRANSITIONS
MATHEMATICAL OPERATORS
PARTICLE PROPERTIES
QUANTUM OPERATORS
VARIATIONS