Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 15: Poster I
A 15.27: Poster
Tuesday, March 12, 2024, 17:00–19:00, Tent A
Magnetic field stability in our ion trap and the ion as a quantum sensor — •Ole Pikkemaat, Apurba Das, Deviprasath Palani, Florian Hasse, Leon Goepfert, Frederike Doerr, Ulrich Warring, and Tobias Schaetz — Institute of Physics, University of Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany
Setting up an ion trap includes well-prepared considerations regarding the choice of both magnetic field strength and stability [1]. For a chosen qubit in the ions energy level structure, in general described by the superposition state | Φ ⟩= c1 | 0 ⟩ + c2 eiϕ| 1 ⟩, magnetic field fluctuations destroy the well-defined phase relation ϕ between the energy level states, leading to loss of coherence, i.e. lower T2 times. We want to archive an equivalent hybrid B-field setup as in [1] to enhance the stability, i.e. to increase T2 times for the 25Mg+ ions we are trapping. In the hybrid setup, permanent magnets are used to create a magnetic field of ≃ 109G to permit B-field independent transitions. They replace high-current coils, intending to reduce the related heat which causes instability of the magnetic field. In addition, three small coil pairs in a cartesian setup allow changing minor deviations and establishing active stabilization. Next to the characterization of the magnetic field using ’classical’ sensors, the ion will be exploited as a quantum sensor to probe the magnetic field directly. Looking forward to future applications of quantum sensors, turning the ’disadvantage’ of the qubits being prone to external influences into a feature for excellent sensors. [1] Hakelberg, F. et al. Sci Rep 8, 4404 (2018)
Keywords: Magnetic field; Magnetic field stability; Quantum Sensor