Noise in Bose Josephson junctions: Decoherence and phase relaxation

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.033621· OSTI ID:21450618

Ferrini, G; Minguzzi, A; Hekking, F W. J. ^[1]; Spehner, D ^[1]

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1. Laboratoire de Physique et Modelisation des Milieux Condenses, Universite Joseph Fourier and CNRS, Boite Postale 166, F-38042 Grenoble (France)

Squeezed states and macroscopic superpositions of coherent states have been predicted to be generated dynamically in Bose Josephson junctions. We solve exactly the quantum dynamics of such a junction in the presence of a classical noise coupled to the population-imbalance number operator (phase noise), accounting for, for example, the experimentally relevant fluctuations of the magnetic field. We calculate the correction to the decay of the visibility induced by the noise in the non-Markovian regime. Furthermore, we predict that such a noise induces an anomalous rate of decoherence among the components of the macroscopic superpositions, which is independent of the total number of atoms, leading to potential interferometric applications.

• OSTI ID: 21450618
• Journal Information: Physical Review. A, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevA.82.033621; (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
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
74 ATOMIC AND MOLECULAR PHYSICS
ANNIHILATION OPERATORS
ATOMS
CORRECTIONS
COUPLING
EIGENSTATES
EXCITED STATES
FLUCTUATIONS
JOSEPHSON JUNCTIONS
MAGNETIC FIELDS
MARKOV PROCESS
NOISE
RELAXATION
ENERGY LEVELS
MATHEMATICAL OPERATORS
QUANTUM OPERATORS
STOCHASTIC PROCESSES
SUPERCONDUCTING JUNCTIONS
VARIATIONS