Possible entanglement detection with the naked eye

Nicolas Brunner*, Cyril Branciard, Nicolas Gisin

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

19 Citations (Scopus)

Abstract

The human eye can detect optical signals containing only a few photons. We investigate the possibility to demonstrate entanglement with such biological detectors. While one person could not detect entanglement by simply observing photons, we discuss the possibility for several observers to demonstrate entanglement in a Bell-type experiment, in which standard detectors are replaced by human eyes. Using a toy model for biological detectors that captures their main characteristic, namely, a detection threshold, we show that Bell inequalities can be violated, thus demonstrating entanglement. Remarkably, when the response function of the detector is close to a step function, quantum nonlocality can be demonstrated without any further assumptions. For smoother response functions, as for the human eye, postselection is required.

Original languageEnglish
Article number052110
Number of pages5
JournalPhysical Review A: Atomic, Molecular and Optical Physics
Volume78
Issue number5
DOIs
Publication statusPublished - Nov 2008

Keywords

  • BELL INEQUALITY
  • ABSOLUTE THRESHOLD
  • STATES

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