Steady state entanglement of two coupled qubits

Details Steady state entanglement of two coupled qubits Steady state entanglement of two coupled qubits

2010-05-24

arxiv.org/abs/1005.4383v1

JOSA B, Vol. 28, p. 228-235 (2011)

Physics

Quantum Physics

7 pages, 5 figures

Scientific paper

10.1364/JOSAB.28.000228

The maximum entanglement between two coupled qubits in the steady state under two independent incoherent sources of excitation is reported. Asymmetric configurations where one qubit is excited while the other one dissipates the excitation are optimal for entanglement, reaching values three times larger than with thermal sources. The reason is the purification of the steady state mixture (that includes a Bell state) thanks to the saturation of the pumped qubit. Photon antibunching between the cross emission of the qubits can be used to experimentally evidence the large degrees of entanglement.

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