| Issue |
Europhys. Lett.
Volume 58, Number 3, May 2002
|
|
|---|---|---|
| Page(s) | 328 - 334 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i2002-00642-8 | |
| Published online | 01 August 2002 | |
Conditions for nondistortion interrogation of quantum system
1
Laboratory of Quantum Communication and
Quantum Computation and Department of Physics,
University of Science and Technology of China
Hefei, Anhui 230026, PRC
2
Superconducting Electronics Lab, Electrical
and Computer Engineering Department,
University of Rochester - Rochester, NY 14623, USA
Received:
23
July
2001
Accepted:
5
February
2002
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.
PACS: 03.65.Ta – Foundations of quantum mechanics; measurement theory / 42.50.Ct – Quantum description of interaction of light and matter; related experiments / 03.67.-a – Quantum information
© EDP Sciences, 2002
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