Continuous-variable measurement device independent quantum conferencing with post-selection
arXiv:2203.14657 · doi:10.1038/s41598-022-22251-8
Abstract
A continuous variable (CV), measurement device independent (MDI) quantum key distribution (QKD) protocol is analyzed, enabling three parties to connect for quantum conferencing. We utilise a generalised Bell detection at an untrusted relay and a postselection procedure, in which distant parties reconcile on the signs of the displacements of the quadratures of their prepared coherent states. We derive the rate of the protocol under a collective pure-loss attack, demonstrating improved rate-distance performance compared to the equivalent non-post-selected protocol. In the symmetric configuration in which all the parties lie the same distance from the relay, we find a positive key rate over 6 km. Such postselection techniques can be used to improve the rate of multi-party quantum conferencing protocols at longer distances at the cost of reduced performance at shorter distances.
9 pages, 3 figures
References in corpus (9)
- Device-independent security of quantum cryptography against collective attacks
- Device-independent quantum key distribution secure against collective attacks
- Twin-Field Quantum Key Distribution over 511 km Optical Fiber Linking two Distant Metropolitans
- 600 km repeater-like quantum communications with dual-band stabilisation
- Long-Distance Measurement-Device-Independent Multiparty Quantum Communication
- Experimental Demonstration of Post-Selection based Continuous Variable Quantum Key Distribution in the Presence of Gaussian Noise
- Phase-Matching Quantum Cryptographic Conferencing
- Finite-key Analysis for Quantum Conference Key Agreement with Asymmetric Channels
- Scalable authentication and optimal flooding in a quantum network
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- Finite-Key Analysis for Coherent One-Way Quantum Key Distribution
- Multi-field quantum conferencing overcomes the network capacity limit
- Advances in Continuous Variable Measurement-Device-Independent Quantum Key Distribution
- An Overview of CV-MDI-QKD
- An introductory review of the theory of continuous-variable quantum key distribution: Fundamentals, protocols, and security