Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 20: Symposium: Single Photon Sources and Spectroscopy of Individual Quantum Systems

HL 20.1: Talk

Saturday, March 5, 2005, 10:45–11:15, TU P270

Read-out and manipulation of single electron and nuclear spins and spin pairs — •J. Wrachtrup — University of Stuttgart, Stuttgart, Germany

Optically accessible defects in semiconductors with large band gap show a number of properties which make them interesting candidates for a controlled engineering of quantum states in solids [1]. The talk will concentrate on color centers in diamond. One of the particularly interesting defects, the nitrogen vacancy defect center, has an electron spin paramagnetic ground state. The fluorescence of this defect strongly depends on the spin state of the electron. Single defect centers can be isolated by optical microscopy. It was shown that the spin state of a single defect center can be determined by optical spectroscopy. Microwave and radiofrequency irradiation allows to manipulate single electron and nuclear spins (for example nitrogen and ¹³C) [2,3]. One can create arbitrary spin quantum states, for example Bell states, and probe its dephasing behavior. The talk will describe similar experiments in which for example nanopositioned defect centers are entangled.
[1] F. Jelezko and J. Wrachtrup J. Phys: Cond. Mat. 16 (2004) R1089
[2] F. Jelezko, T. Gaebel, I. Popa, A. Gruber, and J. Wrachtrup Phys. Rev. Lett. 92 (2004) 076401
[3] F. Jelezko, T. Gaebel, I. Popa, A. Gruber, and J. Wrachtrup Phys. Rev. Lett. 93 (2004) 130501