Reconstructing the relaxation dynamics induced by an unknown heat bath

Details Reconstructing the relaxation dynamics induced by an unknown heat bath Reconstructing the relaxation dynamics induced by an unknown heat bath

2011-03-14

arxiv.org/abs/1103.2803v3

Physics Letters A 376, 370-373 (2012)

Physics

Quantum Physics

8 pages, 1 figure; v3: final version to appear in Phys. Lett. A

Scientific paper

10.1016/j.physleta.2011.12.007

In quantum state tomography, one potential source of error is uncontrolled contact of the system with a heat bath whose detailed properties are not known, and whose impact on the system moreover varies between different runs of the experiment. Precisely these variations provide a handle for reconstructing the system's effective relaxation dynamics. I propose a pertinent estimation scheme which is based on a steepest-descent ansatz and maximum likelihood. After reconstructing the relaxation dynamics, the original quantum state of the system can be constrained to a curve in state space.

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