TL;DR
This paper discusses how spin projection noise fundamentally limits the sensitivity of spin-based magnetometers and related experiments, presenting a universal equation that describes this limit.
Contribution
It introduces a simple, universal equation that characterizes the fundamental sensitivity limit imposed by spin projection noise.
Findings
The equation applies broadly to spin-based measurement systems.
Spin projection noise sets a fundamental sensitivity limit.
The equation aids in designing more sensitive magnetometers.
Abstract
Spin projection noise sets a limit for the sensitivity of spin-based magnetometers and experiments searching for parity- and time-reversal-invariance-violating dipole moments. The limit is described by a simple equation that appears to have universal applicability.
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