Secure Anonymous Conferencing in Quantum Networks
arXiv:2111.05363 · doi:10.1103/PRXQuantum.3.040306
Abstract
Users of quantum networks can securely communicate via so-called (quantum) conference key agreement --making their identities publicly known. In certain circumstances, however, communicating users demand anonymity. Here, we introduce a security framework for anonymous conference key agreement with different levels of anonymity, which is inspired by the epsilon-security of quantum key distribution. We present efficient and noise-tolerant protocols exploiting multipartite Greenberger-Horne-Zeilinger (GHZ) states and prove their security in the finite-key regime. We analyze the performance of our protocols in noisy and lossy quantum networks and compare with protocols that only use bipartite entanglement to achieve the same functionalities. Our simulations show that GHZ-based protocols can outperform protocols based on bipartite entanglement and that the advantage increases for protocols with stronger anonymity requirements. Our results strongly advocate the use of multipartite entanglement for cryptographic tasks involving several users.
23 pages and 3 figures. The Supplemental Material is placed at the end of the manuscript. Main changes with respect to previous version: new title, Introduction section reworked, references added, section 10 added in the Supplemental Material
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Cited by in corpus (17)
- Analysis of Multipartite Entanglement Distribution using a Central Quantum-Network Node
- Conference key agreement in a quantum network
- Breaking Rate-Distance Limitation of Measurement-Device-Independent Quantum Secret Sharing
- Breaking universal limitations on quantum conference key agreement without quantum memory
- Overcoming fundamental bounds on quantum conference key agreement
- Extracting GHZ states from linear cluster states
- Quantum cryptography beyond key distribution: theory and experiment
- Multi-field quantum conferencing overcomes the network capacity limit
- Experimental anonymous quantum conferencing
- Anonymous conference key agreement in linear quantum networks
- Experimental anonymous conference key agreement using linear cluster states
- Strong quantum nonlocality: Unextendible biseparability beyond unextendible product basis
- Quantifying multiparticle entanglement with randomized measurements
- Anonymous estimation of intensity distribution of magnetic fields with quantum sensing network
- Quantum-private distributed sensing
- Anonymous and private parameter estimation in networks of quantum sensors
- Lorentz invariants of pure three-qubit states