Observation of a phononic Mollow triplet in a hybrid spin-nanomechanical system

TL;DR

This paper reports the first observation of a phononic Mollow triplet in a hybrid system where a nitrogen vacancy spin qubit is coupled to nanowire vibrations, demonstrating microwave-controlled spin-phonon interactions.

Contribution

It introduces the observation of a phononic Mollow triplet in a hybrid spin-nanomechanical system, revealing new dynamics and control mechanisms for quantum state transfer.

Findings

Observation of a phononic Mollow triplet in a hybrid system

Microwave-induced synchronization of spin and nanowire vibrations

Potential for spin-dependent force exploration and quantum state transfer

Abstract

Reminiscent of the bound character of a qubit's dynamics confined on the Bloch sphere, the observation of a Mollow triplet in the resonantly driven qubit fluorescence spectrum represents one of the founding signatures of Quantum Electrodynamics. Here we report on its observation in a hybrid spin-nanomechanical system, where a Nitro-gen Vacancy spin qubit is magnetically coupled to the vibrations of a Silicon Carbide nanowire. A resonant microwave field turns the originally parametric hybrid interac-tion into a resonant process, where acoustic phonons are now able to induce transitions between the dressed qubit states, leading to synchronized spin-oscillator dynamics. We further explore the vectorial character of the hybrid coupling to the bidimensional de-formations of the nanowire. The demonstrated microwave assisted synchronization of the spin-oscillator dynamics opens novel perspectives for the exploration of spin-dependent forces, the key-ingredient for quantum state transfer.