Sequential weak measurement
Quantum Physics
2009-11-13 v2
Abstract
The notion of weak measurement provides a formalism for extracting information from a quantum system in the limit of vanishing disturbance to its state. Here we extend this formalism to the measurement of sequences of observables. When these observables do not commute, we may obtain information about joint properties of a quantum system that would be forbidden in the usual strong measurement scenario. As an application, we provide a physically compelling characterisation of the notion of counterfactual quantum computation.
Cite
@article{arxiv.0706.1508,
title = {Sequential weak measurement},
author = {Graeme Mitchison and Richard Jozsa and Sandu Popescu},
journal= {arXiv preprint arXiv:0706.1508},
year = {2009}
}