Quantum vampire: collapse-free action at a distance by the photon annihilation operator

  title={Quantum vampire: collapse-free action at a distance by the photon annihilation operator},
  author={Ilya A. Fedorov and Alexander E Ulanov and Y. V. Kurochkin and A. I. Lvovsky},
An absorber placed into a laser beam is expected to cast a shadow. This expectation is confirmed not only by research, but also by our everyday experience. However, the shadow will not be produced if a weak absorber is known with certainty to have removed a photon from an optical state. We show this effect by distributing a state of light, via a beam splitter, between two parties. When one of the parties applies the photon annihilation operator to its portion of the state, the photon gets… 
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