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

Silvana Palacios Alvarez, Pau Gomez, Simon Coop, Roberto Zamora-Zamora, Chiara Mazzinghi, Morgan W. Mitchell*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

14 Sitaatiot (Scopus)
111 Lataukset (Pure)

Abstrakti

We present a magnetic sensor with energy resolution per bandwidth ER < ħ. 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 V = 1,091(30) μm3 for 3.5 s, and thus, ER = 0.075(16)ħ. 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 nature of the single-domain, ultracold two-body interactions allows the system to escape the coherence vs. density trade-off that imposes an energy resolution limit on traditional spin precession sensors. We predict that other Bose-condensed alkalis, especially the antiferromagnetic 23Na, can further improve the energy resolution of this method.

AlkuperäiskieliEnglanti
Artikkelie2115339119
Sivut1-6
Sivumäärä6
JulkaisuProceedings of the National Academy of Sciences of the United States of America
Vuosikerta119
Numero6
DOI - pysyväislinkit
TilaJulkaistu - 8 helmik. 2022
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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