期刊
PHYSICAL REVIEW LETTERS
卷 86, 期 19, 页码 4195-4198出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.4195
关键词
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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. 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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