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 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 electron-spin qubits in the field of a superconducting magnet. We measure a spin-echo coherence time of for the electron-spin resonance at , limited by part-per-billion fractional fluctuations in the magnet's homogeneous field. Vibration isolation of the magnet improved to ms.
- Received 8 March 2016
DOI:https://doi.org/10.1103/PhysRevA.93.062511
©2016 American Physical Society