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Open Quantum Systems Decoherence

Steady Schrödinger cat state of a driven Ising chain

arXiv

Authors: S. Camalet

Year

2012

Paper ID

8689

Status

Preprint

Abstract Read

~2 min

Abstract Words

113

Citations

N/A

Abstract

For short-range interacting systems, no Schrödinger cat state can be stable when their environment is in thermal equilibrium. We show, by studying a chain of two-level systems with nearest-neighbour Ising interactions, that this is possible when the surroundings consists of two heat reservoirs at different temperatures, or of a heat reservoir and a monochromatic field. The asymptotic state of the considered system can be a pure superposition of mesoscopically distinct states, the all-spin-up and all-spin-down states, at low temperatures. The main feature of our model leading to this result is the fact that the Hamiltonian of the chain and the dominant part of its coupling to the environment obey the same symmetry.

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This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
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For short-range interacting systems, no Schrödinger cat state can be stable when their environment is in thermal equilibrium.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1206.2002 [2] arXiv https://arxiv.org/abs/1206.2002 [3] Publisher https://arxiv.org/abs/1206.2002

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