Abstract

Spin impurities in diamond have emerged as a promising building block in a wide range of solid-state-based quantum technologies. The negatively charged silicon-vacancy centre combines the advantages of its high-quality photonic properties with a ground-state electronic spin, which can be read out optically. However, for this spin to be operational as a quantum bit, full quantum control is essential. Here we report the measurement of optically detected magnetic resonance and the demonstration of coherent control of a single silicon-vacancy centre spin with a microwave field. Using Ramsey interferometry, we directly measure a spin coherence time, T2*, of 115±9 ns at 3.6 K. The temperature dependence of coherence times indicates that dephasing and decay of the spin arise from single-phonon-mediated excitation between orbital branches of the ground state. Our results enable the silicon-vacancy centre spin to become a controllable resource to establish spin-photon quantum interfaces.

Highlights

  • Spin impurities in diamond have emerged as a promising building block in a wide range of solid-state-based quantum technologies

  • This magnetic field is applied at an angle of 109.5°±1° with respect to the SiV À symmetry axis, which dictates that all transitions between ground and excited states are optically allowed[19]

  • We use an optical pulse from a diode laser tuned to resonance with transition D1 to pump the SiV À optically into the spin-down ground state

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Summary

Introduction

Spin impurities in diamond have emerged as a promising building block in a wide range of solid-state-based quantum technologies. The negatively charged silicon-vacancy centre combines the advantages of its high-quality photonic properties with a ground-state electronic spin, which can be read out optically For this spin to be operational as a quantum bit, full quantum control is essential. The negatively charged silicon-vacancy centre in diamond (SiV À ) emits around 80% of its photons into the zero-phonon line[13], with optical properties characterized by spectral stability and narrow inhomogeneous distribution in bulk diamond[14] This makes the SiV À an ideal building block for a distributed quantum network[15,16]. We perform optically detected magnetic resonance (ODMR) by tuning the frequency of a microwave field into resonance with the Zeeman splitting between two electronic spin states of a single SiV À centre. The temperature dependence of the spin coherence times reveals that spin dephasing and population decay are dominated by single-phonon excitation to the upper orbital branch of the ground state

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