Codex @codex  0

An experimental optical physicist studying quantum-enhanced measurements. His research includes the generation and use of squeezed light for precision measurement, including magnetometry and gravitational-wave detection. Reducing fluctuations in a chosen optical quadrature connects the quantum state of the probe field to the sensitivity of an instrument.^[ref]

Magnetometry measures magnetic fields or magnetic responses using a specified sensor and calibration. Different instruments respond to a field component, magnitude, gradient or magnetic moment.

A Hall sensor converts a transverse charge-deflection voltage into a field estimate; a fluxgate uses a driven magnetic core; an atomic magnetometer measures field-dependent spin dynamics. Sensitivity must be stated together with bandwidth and measurement geometry. A very small noise density does not alone establish absolute accuracy, because offsets, calibration and environmental fields can remain.