Quantum sensing is inevitably one of the elegant examples for supremacy of quantum technologies over their classical counterparts. One of the desired endeavor of quantum metrology is ac field sensing. Here, by the means of analytical and numerical analysis, we show that many-body systems can be exploited efficiently for detecting the amplitude of an ac field. Due to the periodicity of the dynamics, any local block of the system saturates to a steady state which allows achieving precision for sensing the amplitude well beyond the classical limit. We associate the enhanced
quantum precision to closing of the Floquet gap, resembling the features of quantum sensing in the ground state of critical systems. Remarkably, the scaling of precision with respect to the number of resources becomes close to the Heisenberg limit, along the line where Floquet gap vanishes. This shows the potential of many-body systems for providing quantum enhanced precision in ac field sensing.

Many-body steady-state AC field quantum sensing

QSMI-2: Quantum sensing, metrology and imaging

technical paper

The Institute of Physics and IOP Publishing, in partnership with the Chinese Physical Society (CPS) and the University of Science and Technology of China (USTC) are proud to have brought together the international quantum science community online for this inaugural conference.


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Quantum 2020

The Institute of Physics and IOP Publishing, in partnership with the Chinese Physical Society (CPS) and the University of Science and Technology of China (USTC) are proud to have brought together the international quantum science community online for this inaugural conference.

Early career and leading researchers from universities, industry and government worldwide came together to share, learn and collaborate on the latest research and emerging areas of high interest across quantum science and technology. 

Utkarsh Mishra

1

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Many-body steady-state AC field quantum sensing

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