The DOI matches its Crossref record; 35 of the 35 references it cites were found in a registry or an index.
Experimental quantum key distribution beyond the repeaterless secret key capacity
Open accessAbstract
Quantum communications promise to revolutionize the way information is exchanged and protected. Unlike their classical counterpart, they are based on dim optical pulses that cannot be amplified by conventional optical repeaters. Consequently, they are heavily impaired by propagation channel losses, confining their transmission rate and range below a theoretical limit known as repeaterless secret key capacity. Overcoming this limit with today’s technology was believed to be impossible until the recent proposal of a scheme that uses phase-coherent optical signals and an auxiliary measuring station to distribute quantum information. Here, we experimentally demonstrate such a scheme for the first time and over significant channel losses, in excess of 90 dB. In the high loss regime, the resulting secure key rate exceeds the repeaterless secret key capacity, a result never achieved before. This represents a major step in promoting quantum communications as a dependable resource in today’s world. A proof-of-principle experiment on twin-field quantum key distribution is demonstrated. The key rate overcomes the repeaterless secret key capacity bound limit at channel losses of 85 dB, corresponding to 530 km of ultralow-loss optical fibre.
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Cites
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Satellite-to-ground quantum key distribution
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Cited by
Advances in quantum cryptography
Pirandola, S., Andersen, U. L., Banchi, L., Berta, M., Bunandar, D., Colbeck, R., Englund, D., Gehring, T., Lupo, C., Ottaviani, C., et al. (2020) · Advances in Optics and Photonics · doi:10.1364/aop.361502 · Cited by 2,033
Secure quantum key distribution with realistic devices
Xu, F., Ma, X., Zhang, Q., Lo, H.-K., & Pan, J.-W. (2020) · Reviews of Modern Physics · doi:10.1103/revmodphys.92.025002 · Cited by 1,543
Experimental demonstration of memory-enhanced quantum communication
Bhaskar, M. K., Riedinger, R., Machielse, B., Levonian, D. S., Nguyen, C. T., Knall, E. N., Park, H., Englund, D., Lončar, M., Sukachev, D. D., et al. (2020) · Nature · doi:10.1038/s41586-020-2103-5 · Cited by 587
Chen, J.-P., Zhang, C., Liu, Y., Jiang, C., Zhang, W., Hu, X.-L., Guan, J.-Y., Yu, Z.-W., Xu, H., Lin, J., et al. (2020) · Physical Review Letters · doi:10.1103/physrevlett.124.070501 · Cited by 380
Schioppo, M., Kronjäger, J., Silva, A., Ilieva, R., Paterson, J. W., Baynham, C. F. A., Bowden, W., Hill, I. R., Hobson, R., Vianello, A., et al. (2022) · Nature Communications · doi:10.1038/s41467-021-27884-3 · Cited by 118
Metadata
- Authors
- Minder, M., Pittaluga, M., Roberts, G. L., Lucamarini, M., Dynes, J. F., Yuan, Z. L., & Shields, A. J.
- Venue
- Nature Photonics
- Published
- 2019-03-04
- Volume
- 13
- Issue
- 5
- Pages
- 334-338
- ISSN
- 1749-4885 (ISSN-L)
- 1749-4893
- OpenAlex
- W2919927607
- Cited by
- 298
- References
- 35
- FWCI
- 20.26
- Type
- journal article
- Language
- en
- Open access
- green
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