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Tuesday, October 07, 2008
1:00 PM - 2:00 PM
CNLS Conference Room (TA-3, Bldg 1690)


Stochastic Resonance in Quantum Communication Systems

Mark M. Wilde
University of Southern California

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.


Host: Jim Harrington, P-21