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Possible entanglement detection with the naked eye

Published in Physical Review. A. 2008, vol. 78, no. 5, p. 052110
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.
Keywords Bell theoremQuantum entanglement
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BRUNNER, Nicolas, BRANCIARD, Cyril, GISIN, Nicolas. Possible entanglement detection with the naked eye. In: Physical Review. A, 2008, vol. 78, n° 5, p. 052110. doi: 10.1103/PhysRevA.78.052110 https://archive-ouverte.unige.ch/unige:787

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Deposited on : 2009-02-13

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