Time-polarization coding in quantum cryptography

Bradley Christensen, Daniel R. Kumor, Kevin T. McCusker +3 more

We report on a high-speed quantum cryptography system that utilizes simultaneous entanglement in polarization and time-bins. We also show a practical implementation of information reconciliation using concatenated low density parity check codes.

Ranjith Nair

S. P. Kulik, S. N. Molotkov

Abstract We discuss the photon number splitting attack (PNS) in systems of quantum cryptography with phase coding. It is shown that this attack, as well as the structural equations for the PNS attack for phase encoding, differs physically from the analogous attack applied to the polarization coding. As far as we know, in practice, in all works to date processing of experimental data has been done for phase coding, but using formulas for polarization coding. This can lead to inadequate results for the length of the secret key. These calculations are important for the correct interpretation of the results, especially if it concerns the criterion of secrecy in quantum cryptography.

Soh Kee Pang

Sergienko, Migdall, Datla

Songhao Liu

The present research of international quantum cryptography communication is summarized and analyzed, several quantum cryptography communication systems are introduced and compared, and a new system based on polarization code' is given.