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論文

Isolated electron spins in silicon carbide with millisecond coherence times

Christle, D.*; Falk, A.*; Andrich, A.*; Klimov, P.*; Hassan, J.*; Son, N. T.*; Janz$'e$n, E.*; 大島 武; Awschalom, D.*

Nature Materials, 14(2), p.160 - 163, 2015/02

 被引用回数:244 パーセンタイル:99.22(Chemistry, Physical)

Carbon vacancy - silicon vacancy pair (V$$_{C}$$-V$$_{Si}$$) in silicon carbide (SiC) is regarded as a promising candidate for a qubit for quantum computing since V$$_{C}$$-V$$_{Si}$$ is thought to have electronic states with sharp optical and spin transitions. However, single spin operation using V$$_{C}$$-V$$_{Si}$$ has not yet been succeeded although it was revealed that V$$_{C}$$-V$$_{Si}$$ shows the characteristics as a single photon source (SPS). In this study, we studied spin properties of V$$_{C}$$-V$$_{Si}$$ created in SiC by 2 MeV-electron irradiation. First, we found V$$_{C}$$-V$$_{Si}$$ in SiC using a confocal microscope (CFM) and measured their optical detected magnet resonance (ODMR) at 20 K. Then, their spin coherence was measured from the standard two-pulse Hahn-echo sequence using ODMR. As a result, the spin coherence time exceeding 1 ms was obtained.

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