General upper bounds for distributing conferencing keys in arbitrary quantum networks

Abstract

Secure quantum conferencing refers to a protocol where a number of trusted users generate exactly the same secret key to confidentially broadcast private messages. By a modification of the techniques first introduced in [Pirandola, arXiv:1601.00966], we derive a single-letter upper bound for the maximal rates of secure conferencing in a quantum network with arbitrary topology, where the users are allowed to perform the most powerful local operations assisted by two-way classical communications, and the quantum systems are routed according to the most efficient multipath flooding strategies. More precisely, our analysis allows us to bound the ultimate rates that are achievable by single-message multiple-multicast protocols, where N senders distribute N independent secret keys, and each key is to be shared with an ensemble of M receivers.

Published in the inaugural issue of IET Quantum Communication

References in corpus (5)

• The Quantum Internet
• Experimental quantum key distribution beyond the repeaterless secret key capacity
• Direct and Reverse Secret-Key Capacities of a Quantum Channel
• Conference key agreement with single-photon interference
• Simulation of non-Pauli Channels

Cited by in corpus (15)

• Advances in Quantum Cryptography
• Distributing Multipartite Entanglement over Noisy Quantum Networks
• Conference key agreement in a quantum network
• Breaking Rate-Distance Limitation of Measurement-Device-Independent Quantum Secret Sharing
• Robustness of Noisy Quantum Networks
• Coherent one-way quantum conference key agreement based on twin field
• Finite-key Analysis for Quantum Conference Key Agreement with Asymmetric Channels
• Breaking universal limitations on quantum conference key agreement without quantum memory
• Repeater-like asynchronous measurement-device-independent quantum conference key agreement
• High key rate quantum conference key agreement with unconditional security
• Overcoming fundamental bounds on quantum conference key agreement
• Mixed State Entanglement Classification using Artificial Neural Networks
• Multi-field quantum conferencing overcomes the network capacity limit
• An Overview of CV-MDI-QKD
• Spanning-tree-packing protocol for conference key propagation in quantum networks