Witnessing entanglement in phase space using inefficient detectors

Abstract

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.

5 pages, 2 figures; Revised version

References in corpus (3)

• Entanglement detection
• Measuring measurement
• Testing quantum nonlocality by generalized quasiprobability functions

Cited by in corpus (5)

• Hybrid methods for witnessing entanglement in a microscopic-macroscopic system
• Testing genuine multipartite nonlocality in phase space
• Non-locality of Two Ultracold Trapped Atoms
• High-dimensional Bell test for a continuous variable state in phase space and its robustness to detection inefficiency
• Noise-adaptive test of quantum correlations with quasiprobability functions