Vibration-induced field fluctuations in a superconducting magnet
J. W. Britton, J. G. Bohnet, B. C. Sawyer, H. Uys, M. J. Biercuk, J. J. Bollinger
DOI 10.1103/PhysRevA.93.062511 · Physical Review A
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Abstract
Superconducting magnets enable precise control of nuclear and electron spins, and are used in experiments that explore biological and condensed-matter systems, and fundamental atomic particles. In high-precision applications, a common view is that slow (<1Hz) drift of the homogeneous magnetic-field limits control and measurement precision. We report on previously undocumented higher-frequency field noise (10–200 Hz) that limits the coherence time of Be+9 electron-spin qubits in the 4.46−T field of a superconducting magnet. We measure a spin-echo T2 coherence time of ∼6ms for the Be+9 electron-spin resonance at 124GHz, limited by part-per-billion fractional fluctuations in the magnet's homogeneous field. Vibration isolation of the magnet improved T2 to ∼50 ms.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbTi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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