Quantum Markov Channels for Qubits

Details Quantum Markov Channels for Qubits Quantum Markov Channels for Qubits

2002-10-31

arxiv.org/abs/quant-ph/0211001v1

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.

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