On-chip generation of hybrid polarization-frequency entangled biphoton states

• URL: http://arxiv.org/abs/2207.10943v2
• Date: Thu, 25 Aug 2022 09:28:36 GMT
• Title: On-chip generation of hybrid polarization-frequency entangled biphoton states
• Authors: S. Francesconi, A. Raymond, R. Duhamel, P. Filloux, A. Lema\^itre, P. Milman, M. I. Amanti, F. Baboux, S. Ducci
• Abstract summary: Chip-integrated semiconductor source combines polarization and frequency entanglement. State entanglement is quantified by a combined measurement of the joint spectrum and Hong-ou-Mandel interference of the biphotons.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate a chip-integrated semiconductor source that combines polarization and frequency entanglement, allowing the generation of entangled biphoton states in a hybrid degree of freedom without postmanipulation. Our AlGaAs device is based on type-II spontaneous parametric down-conversion (SPDC) in a counterpropagating phase-matching scheme, in which the modal birefringence lifts the degeneracy between the two possible nonlinear interactions. This allows the direct generation of polarization-frequency entangled photons, at room temperature and telecom wavelength, and in two distinct spatial modes, offering enhanced flexibility for quantum information protocols. The state entanglement is quantified by a combined measurement of the joint spectrum and Hong-ou-Mandel interference of the biphotons, allowing to reconstruct a restricted density matrix in the hybrid polarization-frequency space.

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