Quantum Cryptography With Polarized Entangled Photons

Sergienko, Migdall, Datla

Misha Brodsky, Cristian Antonelli, Mark Shtaif

Distribution of polarization-entangled photon pairs to remote users changes the degree of their entanglement in captivating ways. We will describe bounds to the reach of potential entanglement-based quantum cryptography systems arising from Polarization Mode Dispersion.

Kwiat, White, Peterson +2 more

Evan R. Jeffrey, Joseph B. Altepeter, Paul G. Kwiat

Using a low-loss optical storage loop and polarization entangled photons, we demonstrate a quantum cryptography protocol in which the sifting step is eliminated and every photon may contribute to the final key.

Alicia Sit, Felix Hufnagel, Ebrahim Karimi

Alberto Casado, S. Guerra, J. Plácido

In this paper, the theory of parametric down-conversion in the Wigner representation is applied to Ekert's quantum cryptography protocol. We analyse the relation between two-photon entanglement and (non-secure) quantum key distribution within the Wigner framework in the Heisenberg picture. Experiments using two-qubit polarization entanglement generated in nonlinear crystals are analysed in this formalism, along with the effects of eavesdropping attacks in the case of projective measurements.