Quantum cryptography with bright entangled beams

Summary form only given. Recently, a scheme for the generation of bright entangled beams has been suggested. The EPR-like quantum correlations are produced by letting two amplitude-squeezed bright optical fields interfere on a 50:50 beamsplitter. The phase (PM) and amplitude (AM) uncertainty measurements exhibit strong correlations and anticorrelations which can be detected by recording the difference (sum) of the PM (AM) photocurrents. In this paper we present a simple version of the quantum key distribution protocol. We believe that the suggested scheme provides an efficient and novel approach to continuous variable quantum communication.