Portable and integrated entanglement sources for quantum communication

Tiphaine Kouadou; Paul G. Kwiat

doi:10.1117/12.2676399

3 October 2023 Portable and integrated entanglement sources for quantum communication

Tiphaine Kouadou, Paul G. Kwiat

Proceedings Volume 12692, Quantum Communications and Quantum Imaging XXI; 126920B (2023) https://doi.org/10.1117/12.2676399
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

We present integrated sources of polarization entanglement built on portable platforms for quantum communication. We employ type-II degenerate spontaneous parametric down conversion processes in periodically poled potassium titanyl phosphate (PPKTP) waveguides to generate pairs of orthogonally polarized photons at near-infrared wavelengths. We use balanced non-polarizing beam splitter (NPBS) to generate post-selected polarization-entangled states via coincidence measurements and investigate the power and spectral tunability of the system. The small size of the waveguides allows the installation of several units on the same platform, and thereby the generation of multiple entangled states simultaneously. We built a separate platform containing a computer-controlled tomography system to characterize the produced states and another NPBS is installed to combine photons from adjacent waveguides and assess their interferability, a prerequisite to entanglement swapping. The overall experiment is compact and requires little alignment when set, making it an attractive option for local quantum networking using mobile platforms, e.g., drones or satellites.

Conference Presentation

Citation Download Citation

Tiphaine Kouadou and Paul G. Kwiat "Portable and integrated entanglement sources for quantum communication", Proc. SPIE 12692, Quantum Communications and Quantum Imaging XXI, 126920B (3 October 2023); https://doi.org/10.1117/12.2676399

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