Controllable Gaussian-qubit interface for extremal quantum state engineering

Details Controllable Gaussian-qubit interface for extremal quantum state engineering Controllable Gaussian-qubit interface for extremal quantum state engineering

2010-03-11

arxiv.org/abs/1003.2402v2

Phys. Rev. Lett. 104, 240501 (2010)

Physics

Quantum Physics

4+3 pages, 6 figures, RevTeX4. Close to published version with appendix

Scientific paper

We study state engineering through bilinear interactions between two remote qubits and two-mode Gaussian light fields. The attainable two-qubit states span the entire physically allowed region in the entanglement-versus-global-purity plane. Two-mode Gaussian states with maximal entanglement at fixed global and marginal entropies produce maximally entangled two-qubit states in the corresponding entropic diagram. We show that a small set of parameters characterizing extremally entangled two-mode Gaussian states is sufficient to control the engineering of extremally entangled two-qubit states, which can be realized in realistic matter-light scenarios.

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