Agile and versatile quantum communication: signatures and secrets
arXiv:2001.10089 · doi:10.1103/PhysRevX.11.011038
Abstract
Agile cryptography allows for a resource-efficient swap of a cryptographic core in case the security of an underlying classical cryptographic algorithm becomes compromised. Conversely, versatile cryptography allows the user to switch the cryptographic task without requiring any knowledge of its inner workings. In this paper, we suggest how these related principles can be applied to the field of quantum cryptography by explicitly demonstrating two quantum cryptographic protocols, quantum digital signatures (QDS) and quantum secret sharing (QSS), on the same hardware sender and receiver platform. Crucially, the protocols differ only in their classical post-processing. The system is also suitable for quantum key distribution (QKD) and is highly compatible with deployed telecommunication infrastructures, since it uses standard quadrature phase shift keying (QPSK) encoding and heterodyne detection. For the first time, QDS protocols are modified to allow for postselection at the receiver, enhancing protocol performance. The cryptographic primitives QDS and QSS are inherently multipartite and we prove that they are secure not only when a player internal to the task is dishonest, but also when (external) eavesdropping on the quantum channel is allowed. In our first proof-of-principle demonstration of an agile and versatile quantum communication system, the quantum states were distributed at GHz rates. This allows for a one-bit message to be securely signed using our QDS protocols in less than 0.05 ms over a 2 km fiber link and in less than 0.2~s over a 20 km fiber link. To our knowledge, this also marks the first demonstration of a continuous-variable direct QSS protocol.
arXiv comment11+6 pages. 8 figures. Accepted to Physical Review X
References in corpus (26)
- Distillation of secret key and entanglement from quantum states
- Continuous Variable Quantum Cryptography - beating the 3 dB loss limit
- Security of continuous-variable quantum key distribution via a Gaussian de Finetti reduction
- Unconditional security of entanglement-based continuous-variable quantum secret sharing
- Quantum Digital Signatures without quantum memory
- Experimental demonstration of quantum digital signatures using phase-encoded coherent states of light
- Realization of Quantum Digital Signatures without the requirement of quantum memory
- Quantum digital signatures with quantum key distribution components
- Asymptotic security analysis of discrete-modulated continuous-variable quantum key distribution
- Secure Quantum Signatures Using Insecure Quantum Channels
- Experimentally realizable quantum comparison of coherent states and its applications
- Asymptotic security of continuous-variable quantum key distribution with a discrete modulation
- Experimental measurement-device-independent quantum digital signatures
- Practical Quantum Digital Signature
- Security of Binary Modulated Continuous Variable Quantum Key Distribution under Collective Attacks
- Quantum secret sharing using weak coherent states
- Experimental Quantum Digital Signature over 102 km
- Experimental demonstration of kilometer-range quantum digital signatures
- Experimental measurement-device-independent quantum digital signatures over a metropolitan network
- Free-space quantum signatures using heterodyne detection
- Experimental transmission of quantum digital signatures over 90-km of installed optical fiber using a differential phase shift quantum key distribution system
- A security proof of continuous-variable QKD using three coherent states
- Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels
- The Engineering of a Scalable Multi-Site Communications System Utilizing Quantum Key Distribution (QKD)
- 280-km experimental demonstration of quantum digital signature with one decoy state
- Continuous-variable quantum digital signatures over insecure channels
Cited by in corpus (11)
- Experimental quantum secure network with digital signatures and encryption
- Advanced Architectures for High-Performance Quantum Networking
- Breaking Rate-Distance Limitation of Measurement-Device-Independent Quantum Secret Sharing
- One-Time Universal Hashing Quantum Digital Signatures without Perfect Keys
- Secure and practical multiparty quantum digital signatures
- Integrated quantum communication network and vibration sensing in optical fibers
- Quantum steering as a resource for secure tripartite Quantum State Sharing
- Continuous-variable quantum digital signatures that can withstand coherent attacks
- Asynchronous measurement-device-independent quantum digital signatures
- Efficient source-independent quantum conference key agreement
- Sharing classical secrets with continuous-variable entanglement: Composable security and network coding advantage