Polarization entangled photon-pair source in a dual displacement interferometric configuration

Giacomo Paganini; Álvaro Cuevas; Robin Camphausen; Alexander Demuth; Valerio Pruneri

doi:10.1117/12.3017509

10 June 2024 Polarization entangled photon-pair source in a dual displacement interferometric configuration

Giacomo Paganini, Álvaro Cuevas, Robin Camphausen, Alexander Demuth, Valerio Pruneri

Proceedings Volume 12993, Quantum Technologies 2024; 129930I (2024) https://doi.org/10.1117/12.3017509
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

Polarization-Entangled Photon Sources (EPS) are an important enabling technology in the fields of quantum sensing, quantum communication, and quantum computing. Recently, a need has arisen for efficient sources of entangled photons with high brightness and phase stability, for use in free space and fiber-based quantum communication links. In this work, we present a prototype of EPS based on commercial bulk opto-mechanical components, generating photon pairs via type-0 parametric down-conversion (SPDC). The source is configured in a linear interferometer, where a dual beam displacement is performed by symmetrically disposed birefringent components. The pairs emission can be prepared as an N00N state for quantum sensing, or as a Bell state for entanglement-based Quantum Key Distribution (QKD) protocols. We show a maximal Bell inequality violation, on ⪆99% average visibility, proving the high quality of the generated entanglement. The unique geometry of this interferometer is intrinsically symmetric, thus completely removing any temporal walk-off and decoherence between the two components of the Bell state and enhancing its suitability for various on-field quantum applications.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Giacomo Paganini, Álvaro Cuevas, Robin Camphausen, Alexander Demuth, and Valerio Pruneri "Polarization entangled photon-pair source in a dual displacement interferometric configuration", Proc. SPIE 12993, Quantum Technologies 2024, 129930I (10 June 2024); https://doi.org/10.1117/12.3017509

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