Controlling spin-spin network dynamics by repeated projective measurements

We show that coupled-spin network manipulations can be made highly effective by repeated projections of the evolving quantum states onto diagonal density-matrix states (populations). As opposed to the intricately crafted pulse trains that are often used to fine-tune a complex network's evolutio...

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Bibliographic Details
Published in:Physical review letters 2012-04, Vol.108 (14), p.140403-140403, Article 140403
Main Authors: Bretschneider, Christian O, Alvarez, Gonzalo A, Kurizki, Gershon, Frydman, Lucio
Format: Article
Language:English
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Summary:We show that coupled-spin network manipulations can be made highly effective by repeated projections of the evolving quantum states onto diagonal density-matrix states (populations). As opposed to the intricately crafted pulse trains that are often used to fine-tune a complex network's evolution, the strategy hereby presented derives from the "quantum Zeno effect" and provides a highly robust route to guide the evolution by destroying all unwanted correlations (coherences). We exploit these effects by showing that a relaxationlike behavior is endowed to polarization transfers occurring within a N-spin coupled network. Experimental implementations yield coupling constant determinations for complex spin-coupling topologies, as demonstrated within the field of liquid-state nuclear magnetic resonance.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.108.140403