Certification of genuine time-bin and energy-time entanglement with integrated photonics

Abstract

Time-bin (TB) and energy-time (ET) entanglement are crucial resources for long-distance quantum information processing. Recently, major efforts have been made to produce compact high-quality sources of TB/ET entangled photons based on solid-state integrated technologies. However, these attempts failed to close the so-called "post-selection loophole". Here, we present an integrated photonic general Bell-test chip for genuine (i.e., free of the post-selection loophole) TB and ET entanglement certification. We report a violation of a Bell inequality by more than 10 standard deviations using our device based on the "hug" interferometric scheme. The experiment also demonstrates that the hug scheme, previously exploited for ET entanglement, can also be used for genuine TB entanglement.

arXiv comment12 pages, 10 figures

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• Frequency-bin entanglement-based quantum key distribution
• Energy-time and time-bin entanglement: past, present and future
• Direct and Efficient Detection of Quantum Superposition
• Gigahertz-rate thin-film lithium niobate receiver for time-bin quantum communication
• A Sagnac-based arbitrary time-bin state encoder for quantum communication applications
• Photonic quantum information with time-bins: Principles and applications