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TT: Fachverband Tiefe Temperaturen

TT 37: Quantum Coherence, Quantum Information Systems 1

TT 37.10: Talk

Wednesday, March 13, 2013, 12:00–12:15, H19

All optical control of the spin state in the NV⁻-center in diamond — •Florian Hilser — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

We describe an all-optical scheme for spin manipulation in the ground-state triplet of the negatively charged nitrogen-vacancy (NV) center in diamond. Virtual optical excitation from the ³A₂ ground state into the ³E excited state allows for spin rotations by virtue of the spin-spin interaction in the two-fold orbitally degenerate excited state. We derive an effective Hamiltonian for optically induced spin-flip transitions within the ground state spin triplet due to off-resonant optical pumping. Furthermore, we investigate the spin qubit formed by the Zeeman sub-levels with spin projection m_S = 0 and m_S = −1 along the NV axis around the ground state level anticrossing with regard to full optical control of the electron spin. Next we focus on cavity mediated coupling of different NV centers by extending this scheme to derive an effective spin-spin-interaction between separate NV center ground states due to exchange of a (virtual) cavity photon [1].
[1] Phys. Rev. B 86 125204