High-fidelity, low-latency polarization quantum state transmissions over a hollow-core conjoined-tube fiber at around 800 nm

• DOI: 10.1364/prj.409521
• Publication Date: 2021-01-25T20:30:16Z
• Authors: Xinyu Chen; Wei Ding; Ying-Ying Wang; Shou-Fei Gao; Feixiang Xu; Huichao Xu; Yi-Feng Hong; Yi-Zhi Sun; Pu Wang; Yan-Qing Lu; Lijian Zhang
• Keywords: Quantum Physics; 0103 physical sciences; FOS: Physical sciences; Quantum Physics (quant-ph); 01 natural sciences; Physics - Optics; Optics (physics.optics)

Hollow-core fiber (HCF) promises to unify air-borne light propagation and non-line-of-sight transmission, thus holding great potential for versatile photonics-based quantum information applications. The early version of HCF based on photonic-bandgap guidance has not proven itself a reliable channel because the poor modal purity in both spatial polarization domains, as well significant difficulty fabrication when wavelength shifts visible region. In this work, degree freedom, we demonstrate high-fidelity ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:mo form="prefix">∼</mml:mo> <mml:mn>0.98</mml:mn> </mml:mrow> </mml:math> ) single-photon transmission distribution entangled photons over 36.4 m hollow-core conjoined-tube (CTF) by using commercial silicon avalanche photodiodes. Our CTF realizes combined merits low loss, high purity, degradation, chromatic dispersion. We also low-latency id="m2"> <mml:mn>99.96</mml:mn> <mml:mo>%</mml:mo> speed vacuum) paving way extensive uses links processing.