Femtotesla Nearly-Quantum-Noise-Limited Pulsed Gradiometer at Earth-Scale Fields
Vito Giovanni Lucivero, W. Lee, Mark Limes, E. L. Foley, T. W. Kornack, Michael Romalis
Abstract
Applications of optical magnetometers in demanding environments require a high common-mode rejection ratio (CMRR) to effectively suppress ambient noise, but challenges still remain to achieve experimental sensitivity at the quantum noise level. The authors develop a compact magnetic gradiometer featuring a high CMRR and a differential sensitivity of tens of femtoteslas over a broad dynamic range, including Earth's field magnitude. This gradiometer is also nearly quantum-noise-limited, which is compatible with quantum enhancement techniques in geomagnetic fields and can be used in unshielded environments such as space science, navigation, and biomedicine.
Topics & Concepts
GradiometerPhysicsShot noiseFaraday effectNoise (video)MagnetometerQuantum noisePhotonComputational physicsMagnetic fieldOpticsQuantumQuantum mechanicsDetectorComputer scienceArtificial intelligenceImage (mathematics)Atomic and Subatomic Physics ResearchQuantum optics and atomic interactionsCold Atom Physics and Bose-Einstein Condensates