Quantum cryptography using femtosecond-pulsed parametric down-conversion

A. V. Sergienko, M. Atatüre, Z. Walton, G. Jaeger, B. E. A. Saleh, M. C. Teich
1999 Physical Review A. Atomic, Molecular, and Optical Physics  
A new scheme for quantum cryptography, based on a distributed polarization quantum intensity interferometer, is presented. Two-photon entangled states generated via the optical nonlinear process of type-II phasematched spontaneous parametric down-conversion are used to securely distribute secret cryptographic keys. The high contrast and stability of the quantum interference pattern obtained by using this design renders it superior to the best existing single-photon polarization technique. In
more » ... on technique. In addition, the use of high-repetition-rate femtosecond pump pulses for down-conversion significantly enhances the production rate of entangled photon pairs for key distribution. ͓S1050-2947͑99͒50910-4͔ PACS number͑s͒: 03.67. Dd, 42.50.Dv, 42.65.Ky RAPID COMMUNICATIONS R2624 PRA 60 A. V. SERGIENKO et al.
doi:10.1103/physreva.60.r2622 fatcat:vqeb7zj2hvc35m5t3somjlx3ze