Hermitian conjugate measurement

Details Hermitian conjugate measurement Hermitian conjugate measurement

2007-09-08

arxiv.org/abs/0709.1210v3

Phys.Rev. A81 (2010) 012110

Physics

Quantum Physics

26 pages, 4 figures; a paragraph is added in the introduction

Scientific paper

10.1103/PhysRevA.81.012110

We propose a new class of probabilistic reversing operations on the state of a system that was disturbed by a weak measurement. It can approximately recover the original state from the disturbed state especially with an additional information gain using the Hermitian conjugate of the measurement operator. We illustrate the general scheme by considering a quantum measurement consisting of spin systems with an experimentally feasible interaction and show that the reversing operation simultaneously increases both the fidelity to the original state and the information gain with such a high probability of success that their average values increase simultaneously.

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