White-light interferometric method for secure key distribution

Ran Gelles, Tal Mor

Tobias J. Haist, Wolfgang Osten

White-light interferometry can be used for solving difficult problems in the field of information science. We give an overview of the method and show examples from ultrafast computing, NP-problems, measurement systems and secure key distribution.

Georgi Bebrov

Abstract The paper introduces the concept of interferometric quantum teleportation. Based on this concept, a quantum secure communication (QSC) protocol, operating in a single‐photon regime is proposed. The proposed protocol is characterized with higher efficiency and data rate than its original counterpart, namely, the teleportation‐based quantum secure communication (T‐QSC). The proposal is verified to be secure. Its security relies on both quantum (polarization of qubits) and relativistic (speed of light) restrictions. The relativistic restriction is possible due to the use of an interferometric quantum channel, like the relativistic quantum key distribution.

Yanbing Li, Shengwei Xu, Qing-Le Wang +2 more

Tobias J. Haist, Wolfgang Osten

Paul Jouguet, Sébastien Kunz-Jacques, Anthony Leverrier

We designed high-efficiency error correcting codes allowing us to extract an errorless secret key in a continuous-variable quantum key distribution (CVQKD) protocol using a Gaussian modulation of coherent states and a homodyne detection. These codes are available for a wide range of signal-to-noise ratios on an additive white Gaussian noise channel with a binary modulation and can be combined with a multidimensional reconciliation method proven secure against arbitrary collective attacks. This improved reconciliation procedure considerably extends the secure range of a CVQKD with a Gaussian modulation, giving a secret key rate of about ${10}^{\ensuremath{-}3}$ bit per pulse at a distance of 120 km for reasonable physical parameters.