Dynamical maps and measurements

Details Dynamical maps and measurements Dynamical maps and measurements

2002-09-13

arxiv.org/abs/quant-ph/0209083v1

Physics

Quantum Physics

5 pages

Scientific paper

We show how a set of POVMs, expressed as a set of $\mu$ linear maps, can be performed with a unitary transformation followed by a von-Neumann measurement with an ancillary system of no more than $\mu N^2$ dimensions. This result shows that all generalized linear transformations and measurements on density matrices can be performed by unitary transformations and von-Neumann measurements by coupling a suitably large ancillary system.

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