Tomography of Quantum Operations

Details Tomography of Quantum Operations Tomography of Quantum Operations

2000-12-14

arxiv.org/abs/quant-ph/0012071v1

Phys. Rev. Lett. vol. 86, pag. 4195 (2001)

Physics

Quantum Physics

Submitted to Phys. Rev. Lett. 2 eps + 1 latex figures

Scientific paper

10.1103/PhysRevLett.86.4195

Quantum operations describe any state change allowed in quantum mechanics, including the evolution of an open system or the state change due to a measurement. In this letter we present a general method based on quantum tomography for measuring experimentally the matrix elements of an arbitrary quantum operation. As input the method needs only a single entangled state. The feasibility of the technique for the electromagnetic field is shown, and the experimental setup is illustrated based on homodyne tomography of a twin-beam.

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