High-Capacity Quantum Secure Direct Communication With Orbital Angular Momentum of Photons

Sichen Mi, Tie-jun Wang, Guang-sheng Jin, Chuan Wang
2015 IEEE Photonics Journal  
Orbital angular momentum (OAM) states of photons span a high-dimensional Hilbert space, and by using it, higher information capacity and enhanced security can be achieved for both classical communication and quantum key distribution. In this work, we propose a feasible basis-independent encoding scheme for OAM states and show its application in high-dimensional quantum secure direct communication, which enables direct transmission of meaningful messages, in addition to random secret key
more » ... hing. Imperfections of optical components may reduce the efficiency of the encoding scheme and, thus, the channel capacity. We discuss the optimal input distribution under realistic conditions to achieve maximal mutual information and an alternative solution using a different set of mutually unbiased bases in the case of a prime-dimensional quantum system. Index Terms: Orbital angular momentum, quantum secure direct communications, mutually unbiased bases.
doi:10.1109/jphot.2015.2465844 fatcat:grppidtpbfb63di3zrf5li2qoa