An approximate method for treating dispersion in one-way quantum channels

Details An approximate method for treating dispersion in one-way quantum channels An approximate method for treating dispersion in one-way quantum channels

2005-07-27

arxiv.org/abs/quant-ph/0507256v1

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevA.73.012317

Coupling the output of a source quantum system into a target quantum system is easily treated by cascaded systems theory if the intervening quantum channel is dispersionless. However, dispersion may be important in some transfer protocols, especially in solid-state systems. In this paper we show how to generalize cascaded systems theory to treat such dispersion, provided it is not too strong. We show that the technique also works for fermionic systems with a low flux, and can be extended to treat fermionic systems with large flux. To test our theory, we calculate the effect of dispersion on the fidelity of a simple protocol of quantum state transfer. We find good agreement with an approximate analytical theory that had been previously developed for this example.

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