Abstract
As an important resource, entanglement light source has been used in developing quantum information technologies, such as quantum key distribution(QKD). There are few experiments implementing entanglement-based deterministic QKD protocols since the security of existing protocols may be compromised in lossy channels. In this work, we report on a loss-tolerant deterministic QKD experiment which follows a modified “Ping-Pong”(PP) protocol. The experiment results demonstrate for the first time that a secure deterministic QKD session can be fulfilled in a channel with an optical loss of 9 dB, based on a telecom-band entangled photon source. This exhibits a conceivable prospect of ultilizing entanglement light source in real-life fiber-based quantum communications.
Highlights
Among entanglement-based two-way protocols, the PP protocol is a pioneering and inspiring work
Telecom fibers together with variable attenuators are used as the quantum channel for travel photons and the storage unit for home photons
To the best of our knowledge, the experiment is the first proof-of-principle demonstration of entanglement-based DQKD over a lossy channel. It demonstrates that MPP can find potential applications in real-life quantum communications based on existing fiber-optic networks
Summary
Among entanglement-based two-way protocols, the PP protocol is a pioneering and inspiring work. The security of PP protocol in lossy quantum channels can not be guaranteed[30,31,32,33], which is the major obstacle to apply it in real-life conditions. The major contribution is to experimentally explore the feasibility of MPP over lossy fiber channels. The experiment results verify the feasibility of MPP protocol over telecom fibers, at least in terms of the optical losses. To the best of our knowledge, the experiment is the first proof-of-principle demonstration of entanglement-based DQKD over a lossy channel. It demonstrates that MPP can find potential applications in real-life quantum communications based on existing fiber-optic networks. Hphtot,ownh. eTrheeHtr(aVve)ldpehnoottoens horizontally (vertically) is sent to Alice through the forward channel (Bob-Alice), while the home photon is stored locally
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
