Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-11-21
Phys. Rev. Lett. 102, 216802 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4.1 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.102.216802
We theoretically model a nuclear-state preparation scheme that increases the coherence time of a two-spin qubit in a double quantum dot. The two-electron system is tuned repeatedly across a singlet-triplet level-anticrossing with alternating slow and rapid sweeps of an external bias voltage. Using a Landau-Zener-Stueckelberg model, we find that in addition to a small nuclear polarization that weakly affects the electron spin coherence, the slow sweeps are only partially adiabatic and lead to a weak nuclear spin measurement and a nuclear-state narrowing which prolongs the electron spin coherence. This resolves some open problems brought up by a recent experiment [D. J. Reilly et al., Science 321, 817 (2008).]. Based on our description of the weak measurement, we simulate a system with up to n=200 nuclear spins per dot. Scaling in n indicates a stronger effect for larger n.
Burkard Guido
Ribeiro Hugo
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