Round-robin differential phase-time-shifting protocol for quantum key distribution: theory and experiment
arXiv:2103.08452 · doi:10.1103/PhysRevApplied.15.044017
Abstract
Quantum key distribution (QKD) allows the establishment of common cryptographic keys among distant parties. Many of the QKD protocols that were introduced in the past involve the challenge of monitoring the signal disturbance over the communication line, in order to evaluate the information leakage to a potential eavesdropper. Recently, a QKD protocol that circumvents the need for monitoring signal disturbance, has been proposed and demonstrated in initial experiments. Here, we propose a new version of this so-called round-robin differential phase-shifting (RRDPS) protocol, in which both time and phase degrees-of-freedom are utilized to enlarge the Hilbert space dimensionality, without increasing experimental complexity or relaxing security assumptions. We derive the security proofs of the round-robin differential phase-time-shifting (RRDPTS) protocol in the collective attack scenario and benchmark the new protocol against RRDPS for different experimental parameters. Furthermore, a proof-of-concept experiment of the RRDPTS protocol, using weak coherent pulses and decoy-state method, is demonstrated over 80 km of fiber link. Our results show that the RRDPTS protocol can achieve higher secret key rate in comparison with the RRDPS, in the condition of high quantum bit error rate.
13 pages, 5 figures
References in corpus (18)
- Advances in Quantum Cryptography
- Quantum Key Distribution with High Loss: Toward Global Secure Communication
- Secure quantum key distribution with realistic devices
- Security Aspects of Practical Quantum Cryptography
- Practical Decoy State for Quantum Key Distribution
- Security against individual attacks for realistic quantum key distribution
- High-dimensional quantum communication: benefits, progress, and future challenges
- Unknown Quantum States: The Quantum de Finetti Representation
- Post-selection technique for quantum channels with applications to quantum cryptography
- Fast, efficient error reconciliation for quantum cryptography
- Experimental demonstration of quantum key distribution without monitoring of the signal disturbance
- Experimental quantum key distribution without monitoring signal disturbance
- Efficient time-bin encoding for practical high-dimensional quantum key distribution
- Experimental Passive Round-Robin Differential Phase-Shift Quantum Key Distribution
- Experimental round-robin differential phase-shift quantum key distribution
- Differential-phase-shift quantum key distribution protocol with small number of random delays
- Experimental demonstration of the DPTS QKD protocol over a 170 km fiber link
- Practical round-robin differential-phase-shift quantum key distribution