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Experimental Test of the State Estimation-Reversal Tradeoff Relation in General Quantum Measurements
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2014 (English)In: Physical Review X, ISSN 2160-3308, E-ISSN 2160-3308, Vol. 4, no 5, 021043- p.Article in journal (Refereed) Published
Abstract [en]

When a measurement has limited strength, only partial information, regarding the initial state, is extracted, and, correspondingly, there is a probability to reverse its effect on the system and retrieve the original state. Recently, a clear and direct quantitative description of this complementary relationship, in terms of a tradeoff relation, was developed by Y. K. Cheong and S. W. Lee. [Phys. Rev. Lett. 109, 150402 (2012)]. Here, this tradeoff relation is experimentally verified using polarization-encoded single photons from a quantum dot. Measurement operators representing a complete range, from not affecting the system to a projection to a single polarization state, are realized. In addition, for each measurement operator, an optimal reversal operator is also implemented. The upper bound of the tradeoff relation is mapped to experimental parameters representing the measurement strength. Our results complement the theoretical work and provide a hands-on characterization of general quantum measurements.

Place, publisher, year, edition, pages
2014. Vol. 4, no 5, 021043- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-105889DOI: 10.1103/PhysRevX.4.021043ISI: 000336914200001OAI: oai:DiVA.org:su-105889DiVA: diva2:733414
Funder
EU, European Research Council, 321031
Note

AuthorCount:15;

Available from: 2014-07-09 Created: 2014-07-08 Last updated: 2017-12-05Bibliographically approved

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Nordic Institute for Theoretical Physics (Nordita)
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