Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-07-30
New J. Phys. 12, 013018 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages 3 figures
Scientific paper
10.1088/1367-2630/12/1/013018
We show that the correlations in stochastic outputs of time-distributed weak measurements can be used to study the dynamics of an individual quantum object, with a proof-of-principle setup based on small Faraday rotation caused by a single spin in a quantum dot. In particular, the third order correlation can reveal the "true" spin decoherence, which would otherwise be concealed by the inhomogeneous broadening effect in the second order correlations. The viability of such approaches lies in that (1) in weak measurement the state collapse which would disturb the system dynamics occurs at a very low probability, and (2) a shot of measurement projecting the quantum object to a known basis state serves as a starter or stopper of the evolution without pumping or coherently controlling the system as otherwise required in conventional spin echo.
Fung Hok-Kin
Fung Shu-Hong
Korotkov Alexander N.
Liu Ren-Bao
Sham L. J.
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