single photon sources for quantum cryptography

Which optical processes are suitable to make probabilistic single photon sources for quantum cryptography?

FREE-DOWNLOAD A Verma…2009 –
ABSTRACT Single photon sources to be used in quantum cryptography must show higher order
antibunching (HOA). HOA is reported by us in several many wave mixing processes. In the present
work we have investigated the possibility of observing HOA in multiwave mixing