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Biphoton spectral quantum interference for information processing and delay metrology

by Suparna Seshadri, Hsuan-hao Lu, Joseph M Lukens, Andrew Weiner
Publication Type
Conference Paper
Book Title
Proceedings of SPIE
Publication Date
Page Number
Publisher Location
Bellingham, Washington, United States of America
Conference Name
Photonics West
Conference Location
San Francisco, California, United States of America
Conference Sponsor
Conference Date

Broadband time-energy entangled photons feature strong temporal correlations with potential for precision delay metrology, but previous work has leveraged only time-of-flight information ultimately limited by the detection jitter and resolution of the time-tagging electronics. Firstly, our work pushes the entanglement-based nonlocal delay metrology from the conventional time-of-flight measurement to a new direction—two-photon interferometry with subpicosecond sensitivity independent of detection resolution. Next, we show the selective sensitivity of frequency-bin encoded Bell states to the sum and difference of biphoton-delays by using a novel reconfigurable setup capable of switching between the Bell states by successively employing single and dual spectral-line pumps.