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Counter-propagating entangled photon pairs from monolayer GaSe.

Zhuoyuan Lu1,2, Jiri Janousek1,2, Syed M Assad2,3,4

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Atomically thin materials enable new quantum technologies through non-phase-matched spontaneous parametric down-conversion (SPDC). Researchers observed photon pairs from monolayer GaSe, confirming quantum correlations and high-fidelity Bell states for quantum information applications.

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Area of Science:

  • Quantum optics
  • Materials science
  • Nanotechnology

Background:

  • Non-phase-matched spontaneous parametric down-conversion (SPDC) in thin materials offers enhanced quantum information capacity.
  • Previous studies faced challenges in observing photon-pair emission from monolayers.
  • Thin materials are promising for quantum computing, communication, and imaging.

Purpose of the Study:

  • To theoretically model and experimentally validate SPDC emission from a monolayer GaSe film.
  • To demonstrate two-photon quantum correlations and high-fidelity Bell states.
  • To explore the potential of atomically thin materials for scalable quantum state generation.

Main Methods:

  • Theoretical modeling of SPDC emission across the full angular space.
  • Experimental validation using co- and counter-propagating photon pair measurements.
  • Characterization of quantum correlations in the telecom C-band.

Main Results:

  • Spatially symmetric, broadband SPDC emission was observed, matching theoretical predictions.
  • Two-photon quantum correlations were demonstrated from a monolayer SPDC source.
  • High-fidelity Bell states were generated in the counter-propagating configuration.

Conclusions:

  • Atomically thin, non-phase-matched SPDC is a viable platform for quantum information.
  • The study confirmed SPDC emission characteristics in the subwavelength regime.
  • Counter-propagating SPDC in thin films offers a scalable and integrable approach for quantum state generation.