Exploiting optical phonon resonance in quantum photonic devices

When the excitation emitted by a Raman Stokes process is coherently absorbed by an antiStokes process, an entangled photon pair is spontaneously produced [1]. This results in the production of correlated Stokes-antiStokes photon pairs mediated by optical phonons in group IV semiconductors such as silicon and diamond [1]. We argue that this mechanism provides the microscopic foundation for spontaneous four-wave mixing and generation of two-mode squeezed states by a Laser pump. Treating the interacting photons and phonons as a hybrid quasiparticle, the Ramaniton, enables a nonperturbative theory that describes how photons and optical phonons evolve coherently inside waveguides [2]. Here we present a master equation for the Ramaniton quasiparticles that accounts for the finite optical phonon relaxation time. We apply our results to group IV semiconductor photonic ring resonators and demonstrate the possibility of exploiting optical phonon resonances for optimal generation of two-mode squeezed states of light.



[1] A. Saraiva, F. S. de Aguiar Júnior, R. de Melo e Souza, A. P. Pena, C. H. Monken, M. F. Santos, B. Koiller, and A. Jorio, Phys. Rev. Lett. 119, 193603 (2017).

[2] S. Timsina, T. Hammadia, S.G. Milani, F.S.D.A. Júnior, A. Brolo, and R. de Sousa, Phys. Rev. Res. 6, 033067 (2024).