Nonclassicality of induced coherence without induced emission

Mayukh Lahiri, Armin Hochrainer, Radek Lapkiewicz, Gabriela Barreto Lemos, and Anton Zeilinger
Phys. Rev. A 100, 053839 – Published 18 November 2019

Abstract

Interference of two beams produced at separate biphoton sources was first observed more than two decades ago. The phenomenon, often called “induced coherence without induced emission,” has recently gained attention after its applications to imaging, spectroscopy, and measuring biphoton correlations have been discovered. The sources used in the corresponding experiments are nonlinear crystals pumped by laser light. The use of a laser pump makes the occurrence of induced (stimulated) emission unavoidable, and the effect of stimulated emission can be observed in the joint detection rate of the two beams. This fact raises the question whether the stimulated emission also plays a role in inducing the coherence. Here we investigate a case in which the crystals are pumped with a single-photon Fock state. We find that coherence is induced even though the possibility of stimulated emission is now fully ruled out. Furthermore, the joint detection rate of the two beams becomes ideally zero. Our results rule out any classical or semiclassical explanation of the phenomenon and also suggest that it is, in principle, possible to perform similar experiments with fermions, for which stimulated emission is strictly forbidden.

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  • Received 3 July 2019

DOI:https://doi.org/10.1103/PhysRevA.100.053839

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & Technology

Authors & Affiliations

Mayukh Lahiri1,*, Armin Hochrainer2,3, Radek Lapkiewicz4, Gabriela Barreto Lemos5, and Anton Zeilinger2,3

  • 1Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078-3072, USA
  • 2Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna, Boltzmanngasse 5, Vienna A-1090, Austria
  • 3Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Boltzmanngasse 3, Vienna A-1090, Austria
  • 4Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, Warsaw 02-093, Poland
  • 5Physics Department, University of Massachusetts Boston, 100 Morrissey Blvd., Boston MA 02125, USA

  • *mlahiri@okstate.edu

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Vol. 100, Iss. 5 — November 2019

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