Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Precision Measurements and Metrology II (with Q)

A 6.2: Vortrag

Montag, 23. März 2015, 15:00–15:15, P/H1

Ultrasensitive magnetometer using a single atom — •Ingo Baumgart1, Jianming-M. Cai2, Alex Retzker3, Martin B. Plenio4, and Christof Wunderlich11Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany — 2School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China — 3Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Givat Ram, Israel — 4Institut für Theoretische Physik, Universität Ulm, 89069 Ulm, Germany

Precision sensing [1], and in particular high precision magnetometry [2], is a central goal of research into quantum technologies. The precision, and thus the sensitivity of magnetometry scales as 1/√T2 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 [2] and merging it with a magnetic sensing protocol, we achieve a measurement sensitivity 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. [1] Giovannetti, V. et al. Nat. Photon. 5, 222 (2011). [2] Balasubramanian, G. et al. Nature 455, 648 (2008). [3] Timoney, N. et al. Nature 476, 185 (2011).

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