Abstract

A method for measuring an integral of a classical field via local interaction of a single quantum particle in a superposition of states is presented. The method is as efficient as a quantum method with qubits passing through the field one at a time and it is exponentially better than any known classical method that uses bits passing through the field one at a time. A related method for searching a string with a quantum particle is proposed.

Date

2005

Authors

Lev Vaidman, Amir Kalev

Journal

Physical Review A

Volume

71

Issue

4

Pages

044303

Publisher

American Physical Society