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Center for Nonlinear Studies |
We discuss three models where a stochastic resonance noise benefit occurs in quantum communication. The first model is a quantum-optical system that employs quantum squeezing and thresholds a continuous quantum variable with homodyne detection. We prove a quantum forbidden-interval theorem that gives necessary and sufficient conditions for a noise benefit in the quantum-optical system. We then show how noise improves fidelity in a modified quantum teleportation protocol and prove a similar forbidden-interval theorem for this scenario. The last model gives a noise benefit in continuous-variable superdense coding and shows how entanglement plays a role in the noise benefit.
References
http://arxiv.org/abs/0801.3141
http://arxiv.org/abs/0801.0096
Host: Jim Harrington, P-21