Direct control of high magnetic fields for cold atom experiments based on NV centers

• URL: http://arxiv.org/abs/2003.08101v2
• Date: Thu, 4 Feb 2021 17:42:56 GMT
• Title: Direct control of high magnetic fields for cold atom experiments based on NV centers
• Authors: Alexander Hesse, Kerim K\"oster, Jakob Steiner, Julia Michl, Vadim Vorobyov, Durga Dasari, J\"org Wrachtrup, Fred Jendrzejewski
• Abstract summary: In cold atomic gases the interactions between the atoms are directly controllable through external magnetic fields. Here, we overcome the limitations of such an indirect control through a direct feedback scheme. We achieve a control of better than 1 ppm after 20 minutes of integration time, ensuring high long-term stability for experiments.
• Score: 50.591267188664666
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In cold atomic gases the interactions between the atoms are directly controllable through external magnetic fields. The magnetic field control is typically performed indirectly by stabilizing the current through a pair of Helmholtz coils, which produce this large bias field. Here, we overcome the limitations of such an indirect control through a direct feedback scheme, which is based on nitrogen-vacancy centers acting as a magnetic field sensor. This allows us to measure and stabilize fields of 4.66 mT down to 12 nT RMS noise over the course of 24 h, measured on a 1 Hz bandwidth. We achieve a control of better than 1 ppm after 20 minutes of integration time, ensuring high long-term stability for experiments. This approach extends direct magnetic field control to strong magnetic fields, which could enable new precise quantum simulations in this regime.

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