Feedback Control of Non-linear Quantum Systems: a Rule of Thumb

Details Feedback Control of Non-linear Quantum Systems: a Rule of Thumb Feedback Control of Non-linear Quantum Systems: a Rule of Thumb

2007-01-09

arxiv.org/abs/quant-ph/0701036v1

Phys. Rev. Lett. 99, 020501 (2007)

Physics

Quantum Physics

4 pages, revtex4, 1 eps figure

Scientific paper

10.1103/PhysRevLett.99.020501

We show that in the regime in which feedback control is most effective -- when measurements are relatively efficient, and feedback is relatively strong -- then, in the absence of any sharp inhomogeneity in the noise, it is always best to measure in a basis that does not commute with the system density matrix than one that does. That is, it is optimal to make measurements that disturb the state one is attempting to stabilize.

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