Quantum Relative States

Details Quantum Relative States Quantum Relative States

2005-07-12

arxiv.org/abs/quant-ph/0507118v2

Physics

Quantum Physics

10 pages

Scientific paper

10.1140/epjd/e2006-00097-y

We study quantum state estimation problems where the reference system with respect to which the state is measured should itself be treated quantum mechanically. In this situation, the difference between the system and the reference tends to fade. We investigate how the overlap between two pure quantum states can be optimally estimated, in several scenarios, and we re-visit homodyne detection.

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