Secure Communication Based on Public Key Distribution with Imbalanced Twin-Field-QKD-like Infrastructure in Classical Coherent Optical Fiber Network

In quantum key distribution (QKD), the twin-field has been proposed as a means to overcome the linear key ratebound, and hence the key generation rate, as well as to enable repeaterless QKD transmission. Despitesignificant progress in TF-QKD and its variations in recent times, the key rates are still significantly low comparedto practical optical fiber networks. Recently, we demonstrated a new approach for phase-encoded public keydistribution based on randomized Glauber states in a classical coherent optical communication system for secureoptical communications (we refer to this as coherent public key distribution CPKD). Establishing how ourpreviously proposed framework can be thought of as the coherent equivalent of TF-QKD can lead us to ensuredata-security at high speed over long distance without being limited by the rate-distance barrier of QKDtransmission. This project focuses on investigating the equivalence between our recently demonstrated CPKDapproach and twin-field quantum key distribution (TF-QKD). If successful, the proof-of-principle demonstrationswill provide a pathway for enabling secure data transmission in the telecommunication infrastructures that formthe backbone of smart cities, industries, and economies.

Mostafa Khalil;Kh Arif Shahriar
Faculty Supervisor: 
Lawrence R. Chen;David Victor Plant
Partner University: