Side-channel-free quantum key distribution.

By Samuel L. Braunstein, Stefano Pirandola. Physical Review Letters, 2011

524 citations recorded by the source corpus.

Quantum key distribution (QKD) offers the promise of absolutely secure communications. However, proofs of absolute security often assume perfect implementation from theory to experiment. Thus, existing systems may be prone to insidious side-channel attacks that rely on flaws in experimental implementation. Here we replace all real channels with virtual channels in a QKD protocol, making the relevant detectors and settings inside private spaces inaccessible while simultaneously acting as a Hilbert space filter to eliminate side-channel attacks. By using a quantum memory we find that we are able to bound the secret-key rate below by the entanglement-distillation rate computed over the distributed states.

View Paper: https://www.semanticscholar.org/paper/48f7169dad564a53efb7dba984cd09fc9c4924e3

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Citations in the corpus

High-rate measurement-device-independent quantum cryptography (2013, methodology): “[11] designed a swapping-like protocol where secret correlations are established by the measurement of a third untrusted party.”
Secure quantum key distribution with realistic devices (2020, background): “…et al., 2002a), SARG-04 (Scarani et al., 2004), coherent-oneway (COW) (Stucki et al., 2005), measurement-deviceindependent (MDI) (Lo et al., 2012) [see also (Braunstein and Pirandola, 2012)] and round-robin DPS (Sasaki et al., 2014), were proposed to address the issues of device imperfections.”
Advances in quantum cryptography (2019, unknown): “implemented with weak coherent pulses and decoy states achieving the ideal rate of η/(2e); (DV-MDI) Ideal implementation of a passive MDI-QKD node [176, 177].”
Practical challenges in quantum key distribution (2016, unknown): “99) and MDI-QKD, 21 have been proposed.”
Fundamental limits of repeaterless quantum communications (2015, unknown): “where FaA :1⁄4 F j iaA F h j is the Bell state as in equation (68) and Uk is one of d2 teleportation unitaries, corresponding to generalized Pauli operators (described below).”
A device-independent quantum key distribution system for distant users (2021, background): “For Alice’s side, such countermeasures are not needed as the BSM setup already serves as a natural filter [42].”
Distributing Secret Keys with Quantum Continuous Variables: Principle, Security and Implementations (2015, methodology): “…protection against all side-channel attacks targeting the detectors of the QKD implementation; [87] considered an MDI-QKD protocol using weak coherent pulses and decoy states, while [88] considered a MDI-QKD protocol in the entanglement-based representation with general ﬁnite-dimensional systems.”