600 km repeater-like quantum communications with dual-band stabilisation
- URL: http://arxiv.org/abs/2012.15099v2
- Date: Mon, 23 May 2022 18:09:41 GMT
- Title: 600 km repeater-like quantum communications with dual-band stabilisation
- Authors: Mirko Pittaluga, Mariella Minder, Marco Lucamarini, Mirko Sanzaro,
Robert I. Woodward, Ming-Jun Li, Zhiliang Yuan and Andrew J. Shields
- Abstract summary: Twin-field (TF) quantum key distribution (QKD) fundamentally alters the rate-distance relationship of QKD, offering the scaling of a single-node quantum repeater.
Recent experiments have demonstrated the new opportunities for secure long-distance communications allowed by TF-QKD, but formidable challenges remain.
We introduce a novel dual-band stabilisation scheme that overcomes past limitations and can be adapted to other phase-sensitive single-photon applications.
- Score: 0.4983856330186121
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Twin-field (TF) quantum key distribution (QKD) fundamentally alters the
rate-distance relationship of QKD, offering the scaling of a single-node
quantum repeater. Although recent experiments have demonstrated the new
opportunities for secure long-distance communications allowed by TF-QKD,
formidable challenges remain to unlock its true potential. Previous
demonstrations have required intense stabilisation signals at the same
wavelength as the quantum signals, thereby unavoidably generating Rayleigh
scattering noise that limits the distance and bit rate. Here, we introduce a
novel dual-band stabilisation scheme that overcomes past limitations and can be
adapted to other phase-sensitive single-photon applications. Using two
different optical wavelengths multiplexed together for channel stabilisation
and protocol encoding, we develop a setup that provides repeater-like key rates
over record communication distances of 555 km and 605 km in the finite-size and
asymptotic regimes respectively, and increases the secure key rate at long
distance by two orders of magnitude to values of practical significance.
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