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Article Dans Une Revue Physical Review Letters Année : 2006

Decoherence in a system of many two-level atoms

Résumé

I show that the decoherence in a system of $N$ degenerate two--level atoms interacting with a bosonic heat bath is for any number of atoms $N$ governed by a generalized Hamming distance (called ''decoherence metric'') between the superposed quantum states, with a time--dependent metric tensor that is specific for the heat bath.The decoherence metric allows for the complete characterization of the decoherence of all possible superpositions of many-particle states, and can be applied to minimize the over-all decoherence in a quantum memory. For qubits which are far apart, the decoherence is given by a function describing single-qubit decoherence times the standard Hamming distance. I apply the theory to cold atoms in an optical lattice interacting with black body radiation.

Dates et versions

hal-00123790 , version 1 (11-01-2007)

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Citer

Daniel Braun. Decoherence in a system of many two-level atoms. Physical Review Letters, 2006, 96 (23), pp.230502. ⟨10.1103/PhysRevLett.96.230502⟩. ⟨hal-00123790⟩
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