Quantum-state disturbance versus information gain: Uncertainty relations for quantum information

Christopher A. Fuchs and Asher Peres
Phys. Rev. A 53, 2038 – Published 1 April 1996
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Abstract

When an observer wants to identify a quantum state, which is known to be one of a given set of nonorthogonal states, the act of observation causes a disturbance to that state. We investigate the trade-off between the information gain and that disturbance. This issue has important applications in quantum cryptography. The optimal detection method, for a given tolerated disturbance, is explicitly found in the case of two equiprobable nonorthogonal pure states. © 1996 The American Physical Society.

  • Received 16 November 1995

DOI:https://doi.org/10.1103/PhysRevA.53.2038

©1996 American Physical Society

Authors & Affiliations

Christopher A. Fuchs

  • Center for Advanced Studies, Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131-1156

Asher Peres

  • Department of Physics, Technion–Israel Institute of Technology, 32 000 Haifa, Israel

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Issue

Vol. 53, Iss. 4 — April 1996

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