Coherent one-way quantum conference key agreement based on twin field

Abstract

Quantum conference key agreement (CKA) enables key sharing among multiple trusted users with information-theoretic security. Currently, the key rates of most quantum CKA protocols suffer from the limit of the total efficiency among quantum channels. Inspired by the coherent one-way and twin-field quantum key distribution (QKD) protocols, we propose a quantum CKA protocol of three users. Exploiting coherent states with intensity 0 and $\mu$ to encode logic bits, our protocol can break the limit. Additionally, the requirements of phase randomization and multiple intensity modulation are removed in our protocol, making its experimental demonstration simple.

6 pages, 4 figures

References in corpus (5)

• Provably Secure and Practical Quantum Key Distribution over 307 km of Optical Fibre
• Sending-or-Not-Sending with Independent Lasers: Secure Twin-Field Quantum Key Distribution Over 509 km
• Long-Distance Measurement-Device-Independent Multiparty Quantum Communication
• Quantum multiparty key distribution protocol without use of entanglement
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Cited by in corpus (7)

• Long-distance twin-field quantum key distribution with entangled sources
• Finite-key Analysis for Quantum Conference Key Agreement with Asymmetric Channels
• Experimental Measurement-Device-Independent Quantum Cryptographic Conferencing
• Efficient source-independent quantum conference key agreement
• Impact of imperfect measurements on multi-party quantum key distribution
• Experimental Phase-Matching Quantum Cryptographic Conferencing in Symmetric and Asymmetric Fiber Channels
• Genuine multipartite entanglement is not necessary for standard device-independent conference key agreement