Quantum State Disturbance vs. Information Gain: Uncertainty Relations for Quantum Information

Abstract

When an observer wants to identify a quantum state, which is known to be one of a given set of non-orthogonal states, the act of observation causes a disturbance to that state. We investigate the tradeoff 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 non-orthogonal pure states.

20 pages, standard LaTeX, four png figures (also available from the authors: [email protected] and [email protected])

References in corpus (1)

• Distinguishability and Accessible Information in Quantum Theory

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