Non-unity gain minimal disturbance measurement

Details Non-unity gain minimal disturbance measurement Non-unity gain minimal disturbance measurement

2007-06-12

arxiv.org/abs/0706.1641v1

Physics

Quantum Physics

12 pages

Scientific paper

10.1103/PhysRevA.76.032309

We propose and experimentally demonstrate an optimal non-unity gain Gaussian scheme for partial measurement of an unknown coherent state that causes minimal disturbance of the state. The information gain and the state disturbance are quantified by the noise added to the measurement outcomes and to the output state, respectively. We derive the optimal trade-off relation between the two noises and we show that the trade-off is saturated by non-unity gain teleportation. Optimal partial measurement is demonstrated experimentally using a linear optics scheme with feed-forward.

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