Measuring complete quantum states with a single observable

Details Measuring complete quantum states with a single observable Measuring complete quantum states with a single observable

2008-03-24

arxiv.org/abs/0803.3398v1

Physical Review A 76, 042117 (2007)

Physics

Quantum Physics

11 pages, 6 figures

Scientific paper

10.1103/PhysRevA.76.042117

Experimental determination of an unknown quantum state usually requires several incompatible measurements. However, it is also possible to determine the full quantum state from a single, repeated measurement. For this purpose, the quantum system whose state is to be determined is first coupled to a second quantum system (the "assistant") in such a way that part of the information in the quantum state is transferred to the assistant. The actual measurement is then performed on the enlarged system including the original system and the assistant. We discuss in detail the requirements of this procedure and experimentally implement it on a simple quantum system consisting of nuclear spins.

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