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Sci Rep. 2015 Oct 15;5:15330. doi: 10.1038/srep15330.

Observation of quantum recoherence of photons by spatial propagation.

Scientific reports

Frédéric Bouchard, Jérémie Harris, Harjaspreet Mand, Nicolas Bent, Enrico Santamato, Robert W Boyd, Ebrahim Karimi


  1. Department of Physics, University of Ottawa, 25 Templeton St., Ottawa, Ontario, K1N 6N5 Canada.
  2. Dipartimento di Scienze Fisiche, Universitá di Napoli "Federico II", Complesso di Monte S. Angelo, 80126 Napoli, Italy.
  3. Institute of Optics, University of Rochester, Rochester, New York, 14627, USA.

PMID: 26469000 PMCID: PMC4606782 DOI: 10.1038/srep15330


Entanglement is at the heart of many unusual and counterintuitive features of quantum mechanics. Once two quantum subsystems have become entangled, it is no longer possible to ascribe an independent state to either; instead, the subsystems are completely described only as part of a greater, composite system. As a consequence of this, each entangled subsystem experiences a loss of coherence following entanglement. We refer to this decrease in coherence as decoherence. Decoherence leads inevitably to the leaking of information from each subsystem to the composite entangled system. Here, we demonstrate a process of decoherence reversal, whereby we recover information lost from the entanglement of the optical orbital angular momentum and radial profile degrees of freedom possessed by a photon pair. These results carry great potential significance, since quantum memories and quantum communication schemes depend on an experimenter's ability to retain the coherent properties of a particular quantum system.


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