Autonomous Dissipative Maxwell’s Demon in a Diamond Spin Qutrit

Engineered dynamical maps combining coherent and dissipative transformations of quantum states with measurements, have demonstrated a number technological applications, promise to be crucial tool in thermodynamic processes. Here, we exploit the control on effective open spin qutrit dynamics an NV center, experimentally realize autonomous feedback process (Maxwell demon) tunable strength. The is enabled by random measurement events that condition subsequent evolution qutrit. efficacy Maxwell demon quantified characterizing fluctuations energy exchanged system environment means generalized Sagawa-Ueda-Tasaki relation for dynamics. This opens way implementation new class demons, which could useful sensing devices.