◇Noise, Decoherence and Control

Noise is frequency-dependent and should be matched to the sensing sequence.

Environmental coupling reduces useful phase information.

Control pulses reverse accumulated unwanted phase while retaining selected signals.

A synchronized pulse sequence selectively amplifies an oscillating signal.

Measuring a quantum system can disturb a conjugate observable.

Realistic sensors exchange information and energy with environments.

Each measurement updates what is known about an unknown parameter.