All-optical formation of coherent dark states of silicon-vacancy spins in diamond

Abstract

Spin impurities in diamond can be versatile tools for a wide range of solid-state-based quantum technologies, but finding spin impurities which offer sufficient quality in both photonic and spin properties remains a challenge for this pursuit. The silicon-vacancy center has recently attracted a lot of interest due to its spin-accessible optical transitions and the quality of its optical spectrum. Complementing these properties, spin coherence is essential for the suitability of this center as a spin-photon quantum interface. Here, we report all-optical generation of coherent superpositions of spin states in the ground state of a negatively charged silicon-vacancy center using coherent population trapping. Our measurements reveal a characteristic spin coherence time, T2*, exceeding 250 nanoseconds at 4 K. We further investigate the role of phonon-mediated coupling between orbital states as a source of irreversible decoherence. Our results indicate the feasibility of all-optical coherent control of silicon-vacancy spins using ultrafast laser pulses.

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References in corpus (9)

• Universal dynamical decoupling of a single solid-state spin from a spin bath
• Unconditional quantum teleportation between distant solid-state qubits
• Indistinguishable photons from separated silicon-vacancy centers in diamond
• Diamond Nanophotonics
• All-optical initialization, readout, and coherent preparation of single silicon-vacancy spins in diamond
• Coherent Population Trapping of Single Spins in Diamond Under Optical Excitation
• The negatively charged nitrogen-vacancy centre in diamond: the electronic solution
• Deterministic coupling of a single silicon-vacancy color center to a photonic crystal cavity in diamond
• Environment-assisted quantum control of a solid-state spin via coherent dark states

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