Ultra-long coherence times amongst room-temperature solid-state spins

E. D. Herbschleb (), H. Kato, Y. Maruyama, T. Danjo, T. Makino, S. Yamasaki, I. Ohki, K. Hayashi, H. Morishita, M. Fujiwara and N. Mizuochi ()
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E. D. Herbschleb: Kyoto University
H. Kato: National Institute of Advanced Industrial Science and Technology (AIST)
Y. Maruyama: Kyoto University
T. Danjo: Kyoto University
T. Makino: National Institute of Advanced Industrial Science and Technology (AIST)
S. Yamasaki: National Institute of Advanced Industrial Science and Technology (AIST)
I. Ohki: Kyoto University
K. Hayashi: Kyoto University
H. Morishita: Kyoto University
M. Fujiwara: Kyoto University
N. Mizuochi: Kyoto University

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: Abstract Solid-state single spins are promising resources for quantum sensing, quantum-information processing and quantum networks, because they are compatible with scalable quantum-device engineering. However, the extension of their coherence times proves challenging. Although enrichment of the spin-zero 12C and 28Si isotopes drastically reduces spin-bath decoherence in diamond and silicon, the solid-state environment provides deleterious interactions between the electron spin and the remaining spins of its surrounding. Here we demonstrate, contrary to widespread belief, that an impurity-doped (phosphorus) n-type single-crystal diamond realises remarkably long spin-coherence times. Single electron spins show the longest inhomogeneous spin-dephasing time ( $$T_2^ \ast \approx 1.5$$ T 2 * ≈ 1.5 ms) and Hahn-echo spin-coherence time (T2 ≈ 2.4 ms) ever observed in room-temperature solid-state systems, leading to the best sensitivities. The extension of coherence times in diamond semiconductor may allow for new applications in quantum technology.

Date: 2019
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DOI: 10.1038/s41467-019-11776-8

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