Quantum nonlinear spectroscopy via correlations of weak Faraday-rotation
measurements
- URL: http://arxiv.org/abs/2309.00207v1
- Date: Fri, 1 Sep 2023 01:50:33 GMT
- Title: Quantum nonlinear spectroscopy via correlations of weak Faraday-rotation
measurements
- Authors: Brian Chung Hang Cheung, Ren-Bao Liu
- Abstract summary: correlations of fluctuations are key to studying fundamental quantum physics and quantum many-body systems.
spectroscopy and noise spectroscopy are powerful tools to characterize fluctuations, but they can access only very few among the many types of higher-order correlations.
A systematic quantum sensing approach, called quantum nonlinear spectroscopy (QNS), is recently proposed for extracting arbitrary types and orders of time-ordered correlations.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The correlations of fluctuations are key to studying fundamental quantum
physics and quantum many-body dynamics. They are also useful information for
understanding and combating decoherence in quantum technology. Nonlinear
spectroscopy and noise spectroscopy are powerful tools to characterize
fluctuations, but they can access only very few among the many types of
higher-order correlations. A systematic quantum sensing approach, called
quantum nonlinear spectroscopy (QNS), is recently proposed for extracting
arbitrary types and orders of time-ordered correlations, using sequential weak
measurement via a spin quantum sensor. However, the requirement of a central
spin as the quantum sensor limits the versatility of the QNS since usually a
central spin interacts only with a small number of particles in proximity and
the measurement of single spins needs stringent conditions. Here we propose to
employ the polarization (a pseudo-spin) of a coherent light beam as a quantum
sensor for QNS. After interacting with a target system (such as a transparent
magnetic material), the small Faraday rotation of the linearly polarized light
can be measured, which constitutes a weak measurement of the magnetization in
the target system. The correlated difference photon counts of a certain numbers
of measurement shots can be made proportional to a certain type and order of
correlations of the magnetic fluctuations in the material. This protocol of QNS
is advantageous for studying quantum many-body systems.
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