Quantum sensing of magnons with a superconducting qubit
ORAL
Abstract
Opportunities for quantum sensing of quanta of collective spin excitations in a ferromagnet, called magnons, are now possible thanks to the demonstrations of both strong resonant and dispersive couplings between a superconducting qubit and the uniform precession mode, or Kittel mode, of a ferromagnetic sphere [1,2]. Based on operations on the qubit conditional on the state of the Kittel mode, single-shot detection of a single magnon with an efficiency reaching about 50% is demonstrated using the protocol of Ref. [3]. The detection efficiency is mainly limited by the qubit readout fidelity. Furthermore, a magnon detection sensitivity of about 10-3 magnons/√Hz is demonstrated using a standard Ramsey interferometry technique. These two complementary quantum sensing methods could find applications in quantum technologies based on magnonics and the detection of axions in dark matter searches.
[1] Y. Tabuchi et al., Science 349, 405-408 (2015).
[2] D. Lachance-Quirion et al., Science Advances 3, e1603150 (2017).
[3] A. Narla et al., Physical Review X 6, 031036 (2016).
[1] Y. Tabuchi et al., Science 349, 405-408 (2015).
[2] D. Lachance-Quirion et al., Science Advances 3, e1603150 (2017).
[3] A. Narla et al., Physical Review X 6, 031036 (2016).
*This work is partly supported by the Project for Developing Innovation System of MEXT, JSPS KAKENHI (26220601, 18F18015), JST ERATO (JPMJER1601), JSPS and FRQNT Postdoctoral Fellowships.
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Presenters
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Dany Lachance-Quirion
- Institut quantique and Département de Physique, Université de Sherbrooke, Sherbrooke, Québec, J1K 2R1, Canada
- Research Center for Advanced Science and Technology, The University of Tokyo
- The University of Tokyo