Weak Cross-Kerr Nonlinearity as a Resource for Quantum State Engineering.

Abstract

Quantum information processing and creation of nonclassical and nonlocal quantum states require presence of a nonlinear element, being challenging to construct and representing a physical resource that should be used in an optimal way. We propose a protocol exploiting only weak cross-Kerr nonlinearities for generating a wide class of continuous variables states of optical systems separated by distances up to more than 100 km. The equation, derived in our work, shows that the protocol parameters are defined in a unique way by the desired final state.