Witnessing entanglement in phase space using inefficient detectors

Details Witnessing entanglement in phase space using inefficient detectors Witnessing entanglement in phase space using inefficient detectors

2009-04-07

arxiv.org/abs/0904.1058v3

Phys. Rev. A 81, 012302 (2010)

Physics

Quantum Physics

5 pages, 2 figures; Revised version

Scientific paper

10.1103/PhysRevA.81.012302

We propose a scheme for witnessing entanglement in phase space by significantly inefficient detectors. The implementation of this scheme does not require any additional process for correcting errors in contrast to previous proposals. Moreover, it allows us to detect entanglement without full a priori knowledge of the detection efficiency. It is shown that entanglement in single photon entangled and two-mode squeezed states can be witnessed with detection efficiency as low as 40%. Our approach enhances the possibility of witnessing entanglement in various physical systems using current detection technologies.

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