Using macroscopic entanglement to close the detection loophole in Bell-inequality tests

Youngrong Lim, Mauro Paternostro, Minsu Kang, Jinhyoung Lee, Hyunseok Jeong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


We consider a Bell-like inequality performed using various instances of multiphoton entangled states to demonstrate that losses occurring after the unitary transformations used in the nonlocality test can be counteracted by enhancing the size of such entangled states. In turn, this feature can be used to overcome detection inefficiencies affecting the test itself: a slight increase in the size of such states, pushing them towards a more macroscopic form of entanglement, significantly improves the state robustness against detection inefficiency, thus easing the closing of the detection loophole. Differently, losses before the unitary transformations cause decoherence effects that cannot be compensated using macroscopic entanglement.

Original languageEnglish
Article number062112
Number of pages5
JournalPhysical Review A (Atomic, Molecular, and Optical Physics)
Issue number6
Publication statusPublished - 19 Jun 2012



ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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