Collective States and Symmetric Local Decoherence in Large Ensembles of Qubits

Details Collective States and Symmetric Local Decoherence in Large Ensembles of Qubits Collective States and Symmetric Local Decoherence in Large Ensembles of Qubits

2008-05-19

arxiv.org/abs/0805.2910v1

Physics

Quantum Physics

4 pages with 2 figures; please see arXiv:0805.2911 for more details

Scientific paper

The symmetric collective states of an atomic spin ensemble (i.e., many-body states that are invariant under particle exchange) are not preserved by decoherence that acts identically but individually on members of the ensemble. We develop a class of collective states in an ensemble of N spin-1/2 particles that is invariant under symmetric local decoherence and find that the dimension of the Hilbert space spanned by these collective states scales only as N^2. We then investigate the open system dynamics of experimentally relevant non-classical collective atomic states, including Schroedinger cat and spin squeezed states, subject to various symmetric but local decoherence models.

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