Enhancing Key Rates of QKD Protocol by Coincidence Detection
Abstract In theory, quantum key distribution (QKD) provides unconditional security; however, its practical implementations are susceptible to exploitable vulnerabilities. This investigation tackles the constraints in practical QKD implementations using weak coherent pulses. The conventional approach of using decoy pulses is improved by integrating it with the coincidence detection (CD) protocol. Additionally, an easy‐to‐implement technique is employed to compute asymptotic key rates for the protocol secure under specific photon number splitting (PNS) attacks. Furthermore, an experimental implementation of the protocol, where it is demonstrated that monitoring coincidences in the decoy state protocol leads to enhanced key rates under realistic experimental conditions, is carried out.
Authors
- Jayanth Ramakrishnan (ORCID: https://orcid.org/0000-0003-1328-4666)
- Shashi Prabhakar (ORCID: https://orcid.org/0000-0002-7337-8755)
- Pooja Chandravanshi (ORCID: https://orcid.org/0000-0001-6802-877X)
- R. P. Singh
- Rutvij Bhavsar (ORCID: https://orcid.org/0000-0003-0503-2549)
- Tanya Sharma (ORCID: https://orcid.org/0000-0001-9744-6129)
- Ayan K. Biswas
Institutions
- Physical Research Laboratory (IN)
- Korea Advanced Institute of Science and Technology (KR)
- Indian Institute of Technology Gandhinagar (IN)
- University of York (GB)
Publication Details
- Journal
- Advanced Quantum Technologies
- Published
- 2025-03-17
- DOI
- https://doi.org/10.1002/qute.202400685
- Citations
- 3
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 7.44
Funders
- Department of Science and Technology, Ministry of Science and Technology, India
- National Research Foundation of Korea
- Engineering and Physical Sciences Research Council