Published on *QUROPE* (http://qurope.eu)

Fri, 2016-06-03 14:33 - Oliver Marty [1]

Date:

2014-11-28

Reference:

arXiv:1411.7893

URL:

Precision sensing, and in particular high precision magnetometry, is a central goal of research into quantum technologies. For magnetometers often trade-offs exist between sensitivity, spatial resolution, and frequency range. The precision, and thus the sensitivity of magnetometry scales as 1/(T2)1/2 with the phase coherence time, T2, of the sensing system playing the role of a key determinant. Adapting a dynamical decoupling scheme that allows for extending T2 by orders of magnitude and merging it with a magnetic sensing protocol, we achieve a measurement sensitivity even for high frequency fields close to the standard quantum limit. Using a single atomic ion as a sensor, we experimentally attain a sensitivity of 4 pT Hz-1/2 for an alternating-current (AC) magnetic field near 14 MHz. Based on the principle demonstrated here, this unprecedented sensitivity combined with spatial resolution in the nanometer range and tuneability from direct-current to the gigahertz range could be used for magnetic imaging in as of yet inaccessible parameter regimes.

**Links:**

[1] http://qurope.eu/users/omarty

[2] http://arxiv.org/abs/1411.7893

[3] http://qurope.eu/category/qics/40-quantum-information-technologies/41-metrology/4190n-new-sensor-technologies

[4] http://qurope.eu/category/qics/40-quantum-information-technologies/41-metrology/4195m-quantum-magnetometry

[5] http://qurope.eu/category/attribute/result

[6] http://qurope.eu/category/projects/ips/siqs

[7] http://qurope.eu/category/qics/10-quantum-computation/13-defeating-errors/1350d-dynamicalalgebraic-decouplingrecoupli