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