Circuit analysis of quantum measurement

Details Circuit analysis of quantum measurement Circuit analysis of quantum measurement

2006-02-16

arxiv.org/abs/quant-ph/0602134v2

Phys. Rev. A 75, 012110 (2007)

Physics

Quantum Physics

11pages, 7figures

Scientific paper

10.1103/PhysRevA.75.012110

We develop a circuit theory that enables us to analyze quantum measurements on a two-level system and on a continuous-variable system on an equal footing. As a measurement scheme applicable to both systems, we discuss a swapping state measurement which exchanges quantum states between the system and the measuring apparatus before the apparatus meter is read out. This swapping state measurement has an advantage in gravitational-wave detection over contractive state measurement in that the postmeasurement state of the system can be set to a prescribed one, regardless of the outcome of the measurement.

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