Volume 104, Number 1, October 2013
|Number of page(s)||6|
|Published online||15 November 2013|
Steady entanglement out of thermal equilibrium
1 Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221 - F-34095, Montpellier, France, EU
2 CNRS, Laboratoire Charles Coulomb UMR 5221 - F-34095, Montpellier, France, EU
3 Institut Universitaire de France - 103, bd Saint- Michel, F-75005, Paris, France, EU
Received: 23 August 2013
Accepted: 11 October 2013
We study two two-level atomic quantum systems (qubits) placed close to a body held at a temperature different from that of the surrounding walls. While at thermal equilibrium the two-qubit dynamics is characterized by non-entangled steady thermal states, we show that the absence of thermal equilibrium may bring to the generation of entangled steady states. Remarkably, this entanglement emerges from the two-qubit dissipative dynamic itself, without any further external action on the two qubits, suggesting a new protocol to create and protect entanglement which is intrinsically robust to environmental effects.
PACS: 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.67.Bg – Entanglement production and manipulation / 03.67.Pp – Quantum error correction and other methods for protection against decoherence
© EPLA, 2013
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