Scientific article

Possible entanglement detection with the naked eye

Publication date2008

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.

  • Bell theorem
  • Quantum entanglement
Citation (ISO format)
BRUNNER, Nicolas, BRANCIARD, Cyril, GISIN, Nicolas. Possible entanglement detection with the naked eye. In: Physical review, A, Atomic, molecular, and optical physics, 2008, vol. 78, n° 5, p. 052110. doi: 10.1103/PhysRevA.78.052110
ISSN of the journal1050-2947

Technical informations

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