Observation of superconductivity and surface noise using a single trapped ion as a field probe
K. Lakhmanskiy, P. C. Holz, D. Schärtl, B. Ames, R. Assouly, T. Monz, Y. Colombe, R. Blatt
DOI 10.1103/PhysRevA.99.023405 · Physical Review A
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Abstract
Measuring and understanding electric-field noise from bulk material and surfaces is important for many areas of physics. In this work, we demonstrate the probing of electric-field noise from different sources with an ion, 225μm above the trap surface. We detect noise levels as small as SE=5.2(11)×10−16V2m−2Hz−1 at ωz=2π×1.51MHz and T=12K. Our setup incorporates a controllable noise source utilizing a high-temperature superconductor. This element allows us, first, to benchmark and validate the sensitivity of our probe. Second, it allows us to probe noninvasively the bulk properties of the superconductor, observing a superconducting transition with an ion. For temperatures below the transition, we use our setup to assess different surface noise processes. The measured surface noise shows a deviation from a power law in the frequency domain. However, the temperature scaling of the data is not in a good agreement with existing surface noise models. Our results open perspectives for models in surface science and pave the way to test them experimentally.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
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