Towards Quantum Experiments with Human Eyes as Detectors Based on Cloning via Stimulated Emission

Pavel Sekatski*, Nicolas Brunner, Cyril Branciard, Nicolas Gisin, Christoph Simon

*Corresponding author for this work

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

62 Citations (Scopus)


We show theoretically that a large Bell inequality violation can be obtained with human eyes as detectors, in a "micro-macro" experiment where one photon from an entangled pair is greatly amplified via stimulated emission. The violation is robust under photon loss. This leads to an apparent paradox, which we resolve by noting that the violation proves the existence of entanglement before the amplification. The same is true for the micro-macro experiments performed so far with conventional detectors. However, we also prove that there is genuine micro-macro entanglement even for high loss.

Original languageEnglish
Article number113601
Number of pages4
JournalPhysical Review Letters
Issue number11
Publication statusPublished - 11 Sep 2009



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