Rapid-purification protocols for optical homodyning

Details Rapid-purification protocols for optical homodyning Rapid-purification protocols for optical homodyning

2007-09-25

arxiv.org/abs/0709.3867v1

Phys. Rev. A 77, 012102 (2008)

Physics

Quantum Physics

6 pages, revtex4, 3 eps figures

Scientific paper

10.1103/PhysRevA.77.012102

We present a number of rapid-purification feedback protocols for optical homodyne detection of a single optical qubit. We derive first a protocol that speeds up the rate of increase of the average purity of the system, and find that like the equivalent protocol for a non-disspative measurement, this generates a deterministic evolution for the purity in the limit of strong feedback. We also consider two analogues of the Wiseman-Ralph rapid-purification protocol in this setting, and show that like that protocol they speed up the average time taken to reach a fixed level of purity. We also examine how the performance of these algorithms changes with detection efficiency, being an important practical consideration.

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