Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 17: Postersitzung II: Transport, Quantenkoh
ärenz, Quantenflüssigkeiten

TT 17.26: Poster

Dienstag, 9. März 2004, 14:30–19:00, Poster A

2-Qubit quantum gate with single spins in a solid state system — •Achim Gruber, Michael Domhan, Thorsten Gaebel, Iulian Popa, Fedor Jelezko, and Jög Wrachtrup — 3. Physikalische Institut, Universität Stuttgart, 70550 Stuttgart, Germany

The preparation, manipulation and detection of single spin states are the essential prerequisites for spin based quantum computation. The coupling of a single C13 spin (I=1/2) to the ground state triplet spin (S=1) of a single nitrogen-vacancy defect center (NV-center)in diamond forms a single 2-qubit system. The joint approach of single molecule spectroscopy and optically detected magnetic resonance (ODMR) allows to detect optically individual NV-centers and to manipulate the spin subsystem of the defect.

Coherent oscillations of the triplet spin in a single NV-Center have been detected. Further pulsed ODMR sequences, derived from optical detected electron nuclear double resonance experiments, allows the coherent control of the coupled spin states. As a first quantum computation operation the conditional rotation gate (CROT) has been implemented. The poster presents the measurements and discusses the limitations due to coherence decay.