• Hayashi, K.
• Yamasaki, S.
• Ohki, I.
• Mizuochi, N.
• Danjo, T.
• Maruyama, Y.
• Herbschleb, E. D.
• Makino, T.

Abstract

<jats:title>Abstract</jats:title><jats:p>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 <jats:sup>12</jats:sup>C and <jats:sup>28</jats:sup>Si 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 (<jats:inline-formula><jats:alternatives><jats:tex-math>T_2^1.5</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mo>*</mml:mo></mml:mrow></mml:msubsup><mml:mo>≈</mml:mo><mml:mn>1.5</mml:mn></mml:math></jats:alternatives></jats:inline-formula> ms) and Hahn-echo spin-coherence time (<jats:italic>T</jats:italic><jats:sub>2</jats:sub> ≈ 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.</jats:p>

Topics

• semiconductor
• mass spectrometry
• Silicon
• Phosphorus