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Single-photon emitters in solid-state systems are important building blocksfor scalable quantum technologies. Recently, quantum light emitters have beendiscovered in the wide-gap van der Waals insulator hBN. These color centershave attracted considerable attention due to their quantum performance atelevated temperatures and wide range of transition energies. Here, wedemonstrate coherent state manipulation of a single hBN color center withultrafast laser pulses and investigate in our joint experiment-theory study thecoupling between the electronic system and phonons. We demonstrate thatcoherent control can not only be performed resonantly on the optical transitiongiving access to the decoherence but also phonon-assisted, which reveals theinternal phonon quantum dynamics. In the case of optical phonons we measuretheir decoherence, stemming in part from their anharmonic decay. Dephasinginduced by the creation of acoustic phonons manifests as a rapid decrease ofthe coherent control signal when traveling phonon wave packets are emitted.Furthermore, we demonstrate that the quantum superposition between aphonon-assisted process and the resonant excitation causes ultrafastoscillations of the coherent control signal. Our results pave the way forultrafast phonon quantum state control on the nanoscale and open up a newpromising perspective for hybrid quantum technologies.

Resonant and phonon-assisted ultrafast coherent control of a single hBN color center