Abstract
The concept of a modular value of an observable of a pre- and postselected quantum system is introduced. It is similar in form and in some cases has a close connection to the weak value of an observable, but instead of describing an effective interaction when the coupling is weak, it describes a coupling of any strength but only to qubit meters. The generalization of the concept for a coupling of a composite system to a multiqubit meter provides an explanation of some current experiments.
- Received 29 July 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.230401
© 2010 The American Physical Society
