Ultrasensitive magnetic field detection using a single artificial atom

M. Bal, C. Deng, J-L. Orgiazzi, F.R. Ong and A. Lupascu ()
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M. Bal: Institute for Quantum Computing, and Waterloo Institute for Nanotechnology, University of Waterloo
C. Deng: Institute for Quantum Computing, and Waterloo Institute for Nanotechnology, University of Waterloo
J-L. Orgiazzi: Institute for Quantum Computing, and Waterloo Institute for Nanotechnology, University of Waterloo
F.R. Ong: Institute for Quantum Computing, and Waterloo Institute for Nanotechnology, University of Waterloo
A. Lupascu: Institute for Quantum Computing, and Waterloo Institute for Nanotechnology, University of Waterloo

Nature Communications, 2012, vol. 3, issue 1, 1-8

Abstract: Abstract Efficient detection of magnetic fields is central to many areas of research and technology. High-sensitivity detectors are commonly built using direct-current superconducting quantum interference devices or atomic systems. Here we use a single artificial atom to implement an ultrasensitive magnetometer with micron range size. The artificial atom, a superconducting two-level system, is operated similarly to atom and diamond nitrogen-vacancy centre-based magnetometers. The high sensitivity results from quantum coherence combined with strong coupling to magnetic field. We obtain a sensitivity of 3.3 pT Hz−1/2 for a frequency at 10 MHz. We discuss feasible improvements to increase sensitivity by one order of magnitude. The intrinsic sensitivity of this detector at frequencies in the 100 kHz–10 MHz range compares favourably with direct-current superconducting quantum interference devices and atomic magnetometers of equivalent spatial resolution. This result illustrates the potential of artificial quantum systems for sensitive detection and related applications.

Date: 2012
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DOI: 10.1038/ncomms2332

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