Single-domain Bose condensate magnetometer achieves energy resolution per bandwidth below h
Year: 2022
Authors: Alvarez S.P., Gomez P., Coop S., Zamora-Zamora R., Mazzinghi C., Mitchell M.W.
Autors Affiliation: Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Barcelona 08860, Spain; Aalto Univ, Quantum Comp & Devices QCD Labs, Dept Appl Phys, FI-00076 Aalto, Finland; Quantum Technol Finland QTF Ctr Excellence, FI-00076 Aalto, Finland; ICREA Inst Catalana Recerca Estudis & Avancats, Barcelona 08010, Spain.
Abstract: We present a magnetic sensor with energy resolution per bandwidth E-R < h. We show how a Rb-87 single-domain spinor BoseEinstein 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) mu m(3) for 3.5 s, and thus, E-R = 0.075(16) h. 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 twobody 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 Na-23, can further improve the energy resolution of this method. Journal/Review: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume: 119 (6) Pages from: e2115339119-1 to: e2115339119-6
More Information: We thank Luca Tagliacozzo for insightful feedback. This work was supported by H2020 Future and Emerging Technologies Quantum Technologies Flagship projects MACQSIMAL (Grant Agreement 820393) and QRANGE (Grant Agreement 820405); H2020 Marie Sklodowska-Curie Actions project ITN ZULF-NMR (Grant Agreement 766402); Spanish Ministry of Science Severo Ochoa Center of Excellence CEX2019000910-S and project OCARINA (PGC2018-097056-B-I00 project funded by MCIN/AEI/10.13039/501100011033/FEDER A way to make Europe); Generalitat de Catalunya through the CERCA program; Agencia de Gestio d’Ajuts Universitaris i de Recerca Grant 2017-SGR-1354; Secretaria d’Universitats i Recerca del Departament d’Empresa i Coneixement de la Generalitat de Catalunya, cofunded by the European Union Regional Development Fund within the ERDF Operational Program of Catalunya (project QuantumCat, ref. 001-P-001644); Fundacio Privada Cellex; Fundacio Mir-Puig; 17FUN03 USOQS, which has received funding from the EMPIR programme cofinanced by the Participating States and from the European Union’s Horizon 2020 research and innovation programme; and CONACYT 255573 (Mexico) PAPIITIN105217 (UNAM).KeyWords: quantum sensing; magnetometry; Bose-Einstein condensatesDOI: 10.1073/pnas.2115339119ImpactFactor: 11.100Citations: 11data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2025-04-27References taken from IsiWeb of Knowledge: (subscribers only)
