Physics – Quantum Physics
Scientific paper
2002-10-31
PRA 67, 062312 (2003)
Physics
Quantum Physics
18 pages, 4 figures
Scientific paper
10.1103/PhysRevA.67.062312
We examine stochastic maps in the context of quantum optics. Making use of the master equation, the damping basis, and the Bloch picture we calculate a non-unital, completely positive, trace-preserving map with unequal damping eigenvalues. This results in what we call the squeezed vacuum channel. A geometrical picture of the effect of stochastic noise on the set of pure state qubit density operators is provided. Finally, we study the capacity of the squeezed vacuum channel to transmit quantum information and to distribute EPR states.
Daffer Sonja
McIver John K.
Wodkiewicz Krzysztof
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