Measurement-based quantum control of mechanical motion

Understand

Controlling a quantum system based on the observation of its dynamics is inevitably complicated by the backaction of the measurement process.

• Efficient measurements, however, maximize the amount of information gained per disturbance incurred.
• Real-time feedback then enables both canceling the measurement's backaction and controlling the evolution of the quantum state.
• While such measurement-based quantum control has been demonstrated in the clean settings of cavity and circuit quantum electrodynamics, its application to motional degrees of freedom has remained elusive.