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9 March 2023 Multi-photon-contributed enhanced visibility of spectral two-photon quantum interference between thermal-gradient states of light
Anahita Khodadad Kashi, Lucia Caspani, Michael Kues
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Proceedings Volume PC12446, Quantum Computing, Communication, and Simulation III; PC1244616 (2023) https://doi.org/10.1117/12.2649270
Event: SPIE Quantum West, 2023, San Francisco, California, United States
Abstract
Spectral Hong-Ou-Mandel effect is experimentally revealed between a thermal field and a heralded state. We demonstrate that multi-photon components in heralded state get engaged in quantum interference which is manifested in improved visibilities for certain mean photon numbers of the thermal field. A theoretical relationship is derived for the visibility, showing its compound dependency on the mean photon number per pulse period within the thermal field and the thermal part of the heralded state. Relying on pulsed excitation, we demonstrate an experimental approach for time-efficient acquisition of visibility. The results of this research are of potential application to high-speed remote secret key-sharing and combating the security gaps arising from multi-photon contamination.
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Anahita Khodadad Kashi, Lucia Caspani, and Michael Kues "Multi-photon-contributed enhanced visibility of spectral two-photon quantum interference between thermal-gradient states of light", Proc. SPIE PC12446, Quantum Computing, Communication, and Simulation III, PC1244616 (9 March 2023); https://doi.org/10.1117/12.2649270
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KEYWORDS
Visibility
Quantum networks
Contamination
Heart
Information security
Quantum information
Quantum information processing
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