Null weak values in multi-level systems
Abstract
A two-step measurement protocol of a quantum system, known as weak value (WV), has been introduced more than two decades ago by Aharonov et al. [1], and has since been studied in various contexts. Here we discuss another two-step measurement protocol which we dub null weak value (NWV). The protocol consists of a partial-collapse measurement followed by quantum manipulation on the system and finally a strong measurement. The first step is a strong measurement which takes place with small probability. The second strong measurement is used as postselection on the outcome of the earlier step. Not being measured in the partial-collapse stage (null outcome) leads to a non-trivial correlation between the two measurements. The NVW protocol, first defined for a two-level system [2], is generalized to a multi-level system, and compared to the standard-WV protocol.
Keywords
Cite
@article{arxiv.1304.1640,
title = {Null weak values in multi-level systems},
author = {Oded Zilberberg and Alessandro Romito and Yuval Gefen},
journal= {arXiv preprint arXiv:1304.1640},
year = {2013}
}
Comments
5 pages, 2 figures, conference proceeding