Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Optics II
Q 8.2: Vortrag
Montag, 23. März 2015, 14:45–15:00, C/HSO
Ground state phonon processes of silicon vacancy centres in diamond and their implications for spin coherence — •Kay Jahnke1, Alp Sipahigil2, Jan Binder1, Marcus Doherty3, Mathias Metsch1, Lachlan Rogers1, Neil Manson3, Mikhail Lukin2, and Fedor Jelezko1 — 1Institute for Quantum Optics and IQST, Ulm University, Ulm, Germany — 2Department of Physics, Harvard University, Cambridge, Massachusetts, USA — 3Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australia
Silicon vacancy (SiV−) centres in diamond have an orbitally degenerate ground state doublet of E symmetry. We investigated the ground state phonon processes by looking at orbital relaxation time. From the linear temperature dependence of the T1 time on temperature we concluded the dominant process to be a single-phonon transfer between orbital states. T1 corresponds closely to the observed spin dephasing time T2*, which gives insight into the fundamentally limiting factor for ground state coherence in this centre. We propose numerous techniques to overcome this limit by either modifying the involved phonon densities or the coupling. This may enable the SiV− centre to overcome its limitation and become the dominating colour centre in diamond.