Decoherence assisting a measurement-driven quantum evolution process

Details Decoherence assisting a measurement-driven quantum evolution process Decoherence assisting a measurement-driven quantum evolution process

2005-12-23

arxiv.org/abs/quant-ph/0512210v3

Physics

Quantum Physics

Four pages, three figures included (lroa@udec.cl)

Scientific paper

10.1103/PhysRevA.73.062327

We study the problem of driving an unknown initial mixed quantum state onto a known pure state without using unitary transformations. This can be achieved, in an efficient manner, with the help of sequential measurements on at least two unbiased bases. However here we found that, when the system is affected by a decoherence mechanism, only one observable is required in order to achieve the same goal. In this way the decoherence can assist the process. We show that, depending on the sort of decoherence, the process can converge faster or slower than the method implemented by means of two complementary observables.

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