Qubit versus bit for measuring an integral of a classical field

Lev Vaidman, Zion Mitrani

Published 2002-12-31, updated 2004-05-16Version 2

Methods for measuring an integral of a classical field via local interaction of classical bits or local interaction of qubits passing through the field one at a time are analyzed. A quantum method, which has an exponentially better precision than any classical method we could see, is described.