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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) |
Files in This Item:
File | Description | Size | Format | |
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2013_PhysRevA_87_052118.pdf | Open Access | 378.59 kB | Adobe PDF | View/Open |
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