2000/12/14 by G. M. D'Ariano, P. Lo Presti · 3 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.86.4195
published as Phys. Rev. Lett. vol. 86, pag. 4195 (2001) · Submitted to Phys. Rev. Lett. 2 eps + 1 latex figures
arxiv created 2000/12/14 · arxiv updated 2009/12/01
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.