Controlling spin-spin network dynamics by repeated projective measurements

Christian O. Bretschneider, Gonzalo A. Alvarez, Gershon Kurizki, Lucio Frydman

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number140403
JournalPhysical review letters
Issue number14
StatePublished - 3 Apr 2012

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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