Conditions for Nondistortion Interrogation of Quantum System

Details Conditions for Nondistortion Interrogation of Quantum System Conditions for Nondistortion Interrogation of Quantum System

2001-03-17

arxiv.org/abs/quant-ph/0103102v3

Europhys. Letts. 58(3), 328, 2002

Physics

Quantum Physics

5 pages, Revtex, 1 figures, Presentation improved, corollary 1 added. To appear in Europhysics Letters

Scientific paper

10.1209/epl/i2002-00642-8

Under some physical considerations, we present a universal formulation to study the possibility of localizing a quantum object in a given region without disturbing its unknown internal state. When the interaction between the object and probe wave function takes place only once, we prove the necessary and sufficient condition that the object's presence can be detected in an initial state preserving way. Meanwhile, a conditioned optimal interrogation probability is obtained.

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