Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 38: Focused Session: Different realizations of quantum registers
HL 38.3: Topical Talk
Donnerstag, 26. März 2009, 10:45–11:15, HSZ 01
Coherence of a single spin in a tunable environment — •Ronald Hanson — Kavli Institute of Nanoscience, Delft University of Technology
Diamond-based materials have recently emerged as a unique platform for quantum science and engineering. Spins of Nitrogen-Vacancy (NV) color centers in diamond can be optically imaged and read out, and exhibit long coherence times. Moreover, the dynamics of the spin environment can be adjusted in situ, providing an excellent system for controlled studies of decoherence in the solid state.
We use high-fidelity quantum control of single NV center spins to study the loss of spin coherence due to interactions with the surrounding bath of electron spins. By tuning the internal bath dynamics as well as the coupling between the bath and the NV spin, we gain access to regimes with strikingly different behaviour [1]. Furthermore, we measure the NV spin coherence time T2 from room temperature down to 1.3 K. We find that T2 increases sharply when the Zeeman energy exceeds the thermal energy, demonstrating that the fluctuations in the spin bath can be fully eliminated through polarization [2]. We will discuss these insights along with our latest results on counteracting decoherence.
[1] R. Hanson et al., Science 320, 352 (2008).
[2] S. Takahashi et al., Phys. Rev. Lett. 101, 047601 (2008).