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

Abstract

The performances of optical fibre-based quantum information systems are limited by the intrinsic properties of silica glass materials, e.g. high latency, Rayleigh-scattering loss wavelength scaling law, and cross-coupling induced modal impurity. Hollow-core optical fibre (HCF) promises to unify air-borne light propagation and non-line-of-sight transmission, thus holding great potentials for versatile photonics-based quantum infor-mation applications. The early version of HCF based on photonic-bandgap guidance has not proven itself as a reliable quantum channel because of the poor modal purity in both spatial and polarization domains, as well as significant difficulty in fabrication when the wavelength shifts to the visible region. In this work, based on the polarization degree of freedom, we first, to the best of our knowledge, demonstrate high-fidelity (~0.98) single-photon transmission and distribution of entangled photons over a conjoined-tube hollow-core fibre (CTF) by using commercial silicon single-photon avalanche photodiodes. Our CTF realized the combined merits of low loss, high spatial mode purity, low polarization degradation, and low chromatic dispersion. We also demonstrate single-photon low latency (~99.96% speed of light in vacuum) transmission, thus paving the way for extensive uses of HCF links in versatile polarization-based quantum information processing.

References in corpus (15)

• Quantum Cryptography
• On the Measurement of Qubits
• Secure quantum key distribution with realistic devices
• A strong loophole-free test of local realism
• A quantum network of clocks
• Quantum process tomography of a controlled-NOT gate
• Quantum enhanced positioning and clock synchronization
• Sending-or-Not-Sending with Independent Lasers: Secure Twin-Field Quantum Key Distribution Over 509 km
• Wide-band quantum interface for visible-to-telecommunication wavelength conversion
• Beating the fundamental rate-distance limit in a proof-of-principle quantum key distribution system
• Quantum improvement of time transfer between remote clocks
• Confinement Loss in Hollow-Core Negative Curvature Fiber: a Multi-Layered Model
• Practical figures of merit and thresholds for entanglement distribution in quantum networks
• Experimental Low-Latency Device-Independent Quantum Randomness
• Statistical properties of the quantum internet

Cited by in corpus (4)

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• Hollow-core fibers with reduced surface roughness and ultralow loss in the short-wavelength range
• Stimulated Raman Scattering and Molecular Modulation in Anti-resonant Hollow-core Fibres
• Coexistence of Entanglement-based Quantum Channels with DWDM Classical Channels over Hollow Core Fibre in a Four Node Quantum Communication Network