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Measurement-device-independent quantum key distribution coexisting with classical communication

Journal Article (2019)
Author(s)

R. Valivarthi (ICFO-Institut de Ciencies Fotoniques, University of Calgary)

P. Umesh (University of Calgary, TU Delft - QID/Tittel Lab)

C. John (University of Calgary)

K. A. Owen (University of Calgary)

V. B. Verma (National Institute of Standards and Technology)

S. W. Nam (National Institute of Standards and Technology)

D. Oblak (University of Calgary)

Q. Zhou (University of Electronic Science and Technology of China, University of Calgary)

W. Tittel (Kavli institute of nanoscience Delft, TU Delft - Electrical Engineering, Mathematics and Computer Science, TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Tittel Lab, University of Calgary)

Research Group
QID/Tittel Lab
DOI related publication
https://doi.org/10.1088/2058-9565/ab2e62 Final published version
More Info
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Publication Year
2019
Language
English
Research Group
QID/Tittel Lab
Journal title
Quantum Science and Technology
Issue number
4
Volume number
4
Article number
045002
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391
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Abstract

The possibility for quantum and classical communication to coexist on the same fiber is important for deployment and widespread adoption of quantum key distribution (QKD) and, more generally, a future quantum internet. While coexistence has been demonstrated for different QKD implementations, a comprehensive investigation for measurement-device independent (MDI) QKD - a recently proposed QKD protocol that cannot be broken by quantum hacking that targets vulnerabilities of single-photon detectors - is still missing. Here we experimentally demonstrate that MDI-QKD can operate simultaneously with at least five 10 Gbps bidirectional classical communication channels operating at around 1550 nm wavelength and over 40 km of spooled fiber, and we project communication rates in excess of 10 THz when moving the quantum channel from the third to the second telecommunication window. The similarity of MDI-QKD with quantum repeaters suggests that classical and generalized quantum networks can co-exist on the same fiber infrastructure.