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  • Letter

Microscopic origin of polarization-entangled Stokes–anti-Stokes photons in diamond

Tiago A. Freitas1,2,3, Paula Machado2,3, Lucas Valente2, Diego Sier2, Raul Corrêa2, Riichiro Saito4, Christophe Galland5, Marcelo F. Santos6, Carlos H. Monken2 et al.

Ado Jorio1,2

  • 1Programa de Pós-Graduação em Engenharia Elétrica
  • 2Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30123-970, Brazil
  • 3Instituto D'Or de Pesquisa e Ensino, Rio de Janeiro, RJ 22281-100, Brazil
  • 4Department of Physics, National Taiwan Normal University, Taipei 106, Taiwan
  • 5Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
  • 6Instituto de Física, UFRJ, Caixa Postal 68528, Rio de Janeiro, RJ 21941-972, Brazil

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Phys. Rev. A 108, L051501 – Published 20 November, 2023

DOI: https://doi.org/10.1103/PhysRevA.108.L051501

Abstract

Time-correlated Stokes–anti-Stokes (SaS) scattering has been studied in different transparent media, more frequently in diamond. While the nonclassical nature of the SaS scattered photons has been well established, the presence of entanglement in this spontaneous four-wave mixing process has not been demonstrated. Here, we show the violation of the Bell-type Clauser-Horne-Shimony-Holt inequality for the polarization of SaS photon pairs near a Raman resonance in diamond. The degree of entanglement depends on the detuning of the photon pairs from the degenerate two-photon pump and on the orientation of the polarization of the incident light with respect to the crystallographic orientation of the sample. This result opens up the possibility to tailor the quantum state of photon pairs without stringent constraints of phase matching and to combine quantum optics and SaS Raman spectroscopy for new applications in materials science and quantum information.

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Phys. Rev. A 108, L051501– Published 20 November, 2023
  • Received 27 May 2023
  • Accepted 18 October 2023
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