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Related Concept Videos

Atomic Emission Spectroscopy: Interference01:30

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Variational quantum metrology with the Loschmidt echo.

Ran Liu1,2,3, Ze Wu1,2, Xiaodong Yang3,4

  • 1CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.

National Science Review
|April 28, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a variational quantum metrology scheme using the Loschmidt echo. The method enhances measurement precision on quantum processors, nearing theoretical limits for practical quantum advantage.

Keywords:
Loschmidt echoquantum Fisher informationquantum metrologyvariational quantum optimization

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Area of Science:

  • Quantum Physics
  • Quantum Metrology
  • Quantum Information Science

Background:

  • Quantum metrology offers precision beyond classical limits using quantum phenomena like superposition and entanglement.
  • Practical implementation faces challenges in engineering nonclassical states and performing measurements, especially for large quantum systems.

Purpose of the Study:

  • To propose and experimentally demonstrate a variational scheme for quantum metrology using the Loschmidt echo.
  • To enable scalable extraction of quantum Fisher information (QFI) for optimizing probe states in noisy quantum systems.

Main Methods:

  • Utilizing hardware-efficient ansatzes in variational quantum circuits.
  • Extracting QFI from experimentally measured Loschmidt echoes.
  • Online optimization of probe state preparation guided by QFI.

Main Results:

  • Experimental implementation on a 10-spin quantum processor.
  • Achieved a 12.4-dB enhancement in measurement precision compared to uncorrelated states.
  • Demonstrated a precision close to the theoretical limit.

Conclusions:

  • The proposed variational scheme effectively enhances quantum metrology precision.
  • The method is scalable and applicable to various noisy intermediate-scale quantum devices.
  • This work presents a promising protocol for demonstrating practical quantum advantages.