Configurable heralded two-photon Fock-states on a chip
Xin Hua, Tommaso Lunghi, Florent Doutre, Panagiotis Vergyris, Gr\'egory Sauder, Pierrick Charlier, Laurent Labont\'e, Virginia D'Auria, Anthony Martin, Sorin Tascu, Marc P. De Micheli, S\'ebastien Tanzilli, and Olivier Alibart
TL;DR
This paper presents a monolithic lithium niobate chip capable of generating configurable two-photon states with high interference visibility, advancing integrated quantum photonics for communication and processing.
Contribution
It introduces a fully integrated lithium niobate device combining nonlinear and electro-optic functions to produce heralded two-photon states with high versatility and performance.
Findings
Achieved 94% raw visibility in Hong-Ou-Mandel interference
Demonstrated generation of various path-coded two-photon states
Enabled exploration of complex quantum information protocols
Abstract
Progress in integrated photonics enables combining several elementary functions on single substrates for realizing advanced functionnalized chips. We report a monolithic integrated quantum photonic realization on lithium niobate, where nonlinear optics and electro-optics properties have been harnessed simultaneously for generating heralded configurable, two-photon states. Taking advantage of a picosecond pump laser and telecom components, we demonstrate the production of various path-coded heralded two-photon states, showing 94\% raw visibility for Hong-Ou-Mandel interference. The versatility and performance of such a highly integrated photonic entanglement source enable exploring more complex quantum information processing protocols finding application in communication, metrology and processing tasks.
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