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Geometric phase magnetometry using a solid-state spin
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DOI：10.1038/s41467-018-07489-z.png)
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摘要
En 中文
A key challenge of magnetometry lies in the simultaneous optimization of magnetic field sensitivity and maximum field range. In interferometry-based magnetometry, a quantum two-level system acquires a dynamic phase in response to an applied magnetic field. However, due to the 2 pi periodicity of the phase, increasing the coherent interrogation time to improve sensitivity reduces field range. Here we introduce a route towards both large magnetic field range and high sensitivity via measurements of the geometric phase acquired by a quantum two-level system. We experimentally demonstrate geometric-phase magnetometry using the electronic spin associated with the nitrogen vacancy (NV) color center in diamond. Our approach enables unwrapping of the 2 pi phase ambiguity, enhancing field range by 400 times. We also find additional sensitivity improvement in the nonadiabatic regime, and study how geometric-phase decoherence depends on adiabaticity. Our results show that the geometric phase can be a versatile tool for quantum sensing applications.
Keyword:
EXPERIMENTAL REALIZATION
MAGNETIC-FIELDS
BERRYS PHASE
QUANTUM
MODEL
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IF:
15.7
论文数:
9.3W
被引数:
91.2W
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