High-dimensional Encoding in the Round-Robin Differential-Phase-Shift Protocol
arXiv:2302.07888 · doi:10.22331/q-2023-12-14-1207
Abstract
In quantum key distribution (QKD), protocols are tailored to adopt desirable experimental attributes, including high key rates, operation in high noise levels, and practical security considerations. The round-robin differential phase shift protocol (RRDPS), falling in the family of differential phase shift protocols, was introduced to remove restrictions on the security analysis, such as the requirement to monitor signal disturbances, improving its practicality in implementations. While the RRDPS protocol requires the encoding of single photons in high-dimensional quantum states, at most, only one bit of secret key is distributed per sifted photon. However, another family of protocols, namely high-dimensional (HD) QKD, enlarges the encoding alphabet, allowing single photons to carry more than one bit of secret key each. The high-dimensional BB84 protocol exemplifies the potential benefits of such an encoding scheme, such as larger key rates and higher noise tolerance. Here, we devise an approach to extend the RRDPS QKD to an arbitrarily large encoding alphabet and explore the security consequences. We demonstrate our new framework with a proof-of-concept experiment and show that it can adapt to various experimental conditions by optimizing the protocol parameters. Our approach offers insight into bridging the gap between seemingly incompatible quantum communication schemes by leveraging the unique approaches to information encoding of both HD and DPS QKD.
arXiv comment14 pages, 6 figures
References in corpus (30)
- Quantum cryptography: Public key distribution and coin tossing
- The Security of Practical Quantum Key Distribution
- Measurement-device-independent quantum key distribution
- Secure quantum key distribution with realistic devices
- Security of quantum key distribution using d-level systems
- Overcoming the rate-distance barrier of quantum key distribution without using quantum repeaters
- High-Dimensional Intra-City Quantum Cryptography with Structured Photons
- Provably-Secure and High-Rate Quantum Key Distribution with Time-Bin Qudits
- Micius quantum experiments in space
- High-Dimensional Quantum Key Distribution based on Multicore Fiber using Silicon Photonic Integrated Circuits
- Overcoming Noise in Entanglement Distribution
- Experimental demonstration of quantum key distribution without monitoring of the signal disturbance
- Measuring azimuthal and radial modes of photons
- 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 investigation of high-dimensional quantum key distribution protocols with twisted photons
- Security of high-dimensional quantum key distribution protocols using Franson interferometers
- Error tolerance of two-basis quantum key-distribution protocols using qudits and two-way classical communication
- Characterization of an underwater channel for quantum communications in the Ottawa River
- Experimental round-robin differential phase-shift quantum key distribution
- Robustness of round-robin differential-phase-shift quantum-key-distribution protocol against source flaws
- Round-Robin Differential Phase-Shift Quantum Key Distribution with Twisted Photons
- Quantum process tomography of a high-dimensional quantum communication channel
- Adaptive generalized measurement for unambiguous state discrimination of quaternary phase-shift-keying coherent states
- Measuring ultrafast time-bin qudits
- Linear optics and photodetection achieve near-optimal unambiguous coherent state discrimination
- Quantum receiver for phase-shift keying at the single photon level
- Refined security proof of the round-robin differential phase shift quantum key distribution and its improved performance in the finite-sized case
- Round-robin differential phase-time-shifting protocol for quantum key distribution: theory and experiment