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TT: Tiefe Temperaturen

TT 22: Quantenkoh
ärenz und Quanteninformationssysteme I

TT 22.1: Talk

Wednesday, March 10, 2004, 14:30–14:45, H19

Coherent oscillations in a single electron spin — •Iulian Popa, Fedor Jelezko, Torsten Gaebel, Achim Gruber, Michael Domhan, and Jörg Wrachtrup — 3.Phys. Institut Universität Stuttgart 70563

Rabi nutations of a single electron spin in a single defect center in diamond have been detected,at room temperature. The N-V defect center in diamond is a defect consisting of a substitutional nitrogen atom adjacent to a carbon-atom vacancy. The optical transition between 3A ground state and 3E excited state has a very high quantum efficiency allowing single defect spectroscopy. Because of paramagnetic nature of the ground electronic state, single N-V defects are believed to be promising candidates for the solid state quantum computation. The coherent evolution of the spin quantum state is followed via optical detection of the spin state. Coherence times up to several microseconds at room temperature have been measured. The influence of the optical excitation on the coherence time is analyzed.