Single-domain Bose condensate magnetometer achieves energy resolution per bandwidth below ℏ.

ABSTRACT: We present a magnetic sensor with energy resolution per bandwidth [Formula: see text] We show how a ⁸⁷Rb single-domain spinor Bose-Einstein condensate, detected by nondestructive Faraday rotation probing, achieves single-shot low-frequency magnetic sensitivity of 72(8) fT measuring a volume [Formula: see text] for 3.5 s, and thus, [Formula: see text] We measure experimentally the condensate volume, spin coherence time, and readout noise and use phase space methods, backed by three-dimensional mean-field simulations, to compute the spin noise. Contributions to the spin noise include one-body and three-body losses and shearing of the projection noise distribution, due to competition of ferromagnetic contact interactions and quadratic Zeeman shifts. Nonetheless, the fully coherent

SUBMITTER: Palacios Alvarez S 

PROVIDER: S-EPMC8833174 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature