Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/5761
Title: Inversion of moments to retrieve joint probabilities in quantum sequential measurements
Authors: Karthik, H.S.
Katiyar, Hemant
Shukla, Abhishek
Mahesh, T.S.
Usha Devi, A.R.
Rajagopal, A.K.
Issue Date: May-2013
Publisher: American Physical Society
Citation: Physical Review A, 2013, Vol.87, p052118
Abstract: A sequence of moments obtained from statistical trials encodes a classical probability distribution. However, it is well known that an incompatible set of moments arises in the quantum scenario, when correlation outcomes associated with measurements on spatially separated entangled states are considered. This feature, viz., the incompatibility of moments with a joint probability distribution, is reflected in the violation of Bell inequalities. Here, we focus on sequential measurements on a single quantum system and investigate if moments and joint probabilities are compatible with each other. By considering sequential measurement of a dichotomic dynamical observable at three different time intervals, we explicitly demonstrate that the moments and the probabilities are inconsistent with each other. Experimental results using a nuclear magnetic resonance system are reported here to corroborate these theoretical observations, viz., the incompatibility of the three-time joint probabilities with those extracted from the moment sequence when sequential measurements on a single-qubit system are considered.
Description: Open Access.
URI: http://hdl.handle.net/2289/5761
ISSN: 1094-1622 (Online)
1050-2947
Alternative Location: http://arxiv.org/abs/1304.0058
http://dx.doi.org/10.1103/PhysRevA.87.052118
Copyright: 2013 American Physical Society
Appears in Collections:Research Papers (LAMP)

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