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Post-selection free time-bin entanglement on a thin-film lithium niobate photonic chip

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arxiv 2505.04598 v1 pith:QF7ZBAEX submitted 2025-05-07 quant-ph

classification quant-ph
keywords time-binentanglementpost-selectionbelldemonstrateencodinghighlithium
verification ladder T0 review T1 audit T2 compute T3 formal
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Time-bin entanglement is the most commonly used form of entanglement for quantum communication protocols over fiber networks, due to the natural resilience of this encoding scheme to thermal phase fluctuations in optical fibers. Projective measurements on some bases in the time-bin encoding need, however, post-selection of the measured events, introducing a loophole in Bell tests and requiring high temporal resolution. In this work, we demonstrate chip-integrated receivers for time-bin entanglement certification including a high-speed optical switch to remove such post-selection loophole. The receivers are realized using thin-film lithium niobate and operate at a switching frequency of 5 GHz, enabling high secure key rates. We demonstrate a Bell inequality violation by more than 24 standard deviations without the need for time resolution at the time-bin separation level.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. A Universal All-Fiber Quantum Buffer for the Telecom Band

    quant-ph 2026-06 unverdicted novelty 7.0 of 10

    Demonstration of a dual-Sagnac all-fiber quantum buffer with 0.46 dB loss, >18 μs storage, >12.5 THz bandwidth, and high-fidelity storage of time-bin, frequency-bin, polarization qubits and entanglement.

  2. A Universal All-Fiber Quantum Buffer for the Telecom Band

    quant-ph 2026-06 unverdicted novelty 6.0 of 10

    Demonstrates a room-temperature all-fiber quantum buffer with 0.46 dB loss, >18 μs storage, >12.5 THz bandwidth, supporting time-bin, frequency-bin, polarization qubits and entanglement preservation.

  3. High-Dimensional Quantum Photonics: Roadmap

    quant-ph 2026-04 unverdicted novelty 2.0 of 10

    The roadmap reviews advances in generating and manipulating high-dimensional quantum states of light across photonic degrees of freedom and outlines common challenges for their integration into future quantum technologies.

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