Phys. Rev. Lett. 66, 1119 - 1122 (1991)Optimal detection of quantum information |
Asher Peres and William K. Wootters
Santa Fe Institute, 1120 Canyon Road, Santa Fe, New Mexico 7501
Department of Physics, Technion–Israel Institute of Technology, Haifa, Israel
Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Department of Physics, Williams College, Williamstown, Massachusetts 01267
Received 15 February 1990
Two quantum systems are identically prepared in different locations. An observer’s task is to determine their state. A simple example shows that a pair of measurements of the von Neumann type is less effective than a sequence of nonorthogonal probability-operator measures, alternating between the two quantum systems. However, the most efficient set of operations of that type that we were able to design falls short of a single combined measurement, performed on both system together.
©1991 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v66/p1119
DOI: 10.1103/PhysRevLett.66.1119
PACS: 03.65.Bz, 89.70.+c
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