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Related Experiment Video

Updated: Jun 2, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Distributed quantum sensing with measurement-after-interaction strategies.

Jiajie Guo1, Shuheng Liu1, Matteo Fadel2

  • 1State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics, Collaborative Innovation Center of Quantum Matter, Peking University, Beijing, China.

NPJ Quantum Information
|June 1, 2026
PubMed
Summary

Measurement-after-interaction (MAI) strategies enhance multiparameter quantum estimation. These advanced quantum sensing protocols improve sensitivity and noise robustness, reaching Heisenberg scaling for spin-squeezed states.

Keywords:
Optics and photonicsPhysics

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Last Updated: Jun 2, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Area of Science:

  • Quantum Information Science
  • Quantum Metrology
  • Quantum Sensing

Background:

  • Multiparameter quantum estimation is crucial for precision measurements.
  • Standard linear measurements face limitations, especially with non-Gaussian states.
  • Measurement-after-interaction (MAI) strategies offer a potential improvement.

Purpose of the Study:

  • To investigate MAI strategies for multiparameter quantum estimation.
  • To analyze the impact of local vs. nonlocal additional evolution in MAI.
  • To benchmark MAI performance in discrete- and continuous-variable systems.

Main Methods:

  • Benchmarking MAI strategies in discrete- and continuous-variable quantum systems.
  • Analyzing probe state evolution before linear measurements.
  • Deriving analytical results for multiparameter squeezing and scaling laws.

Main Results:

  • MAI strategies significantly enhance multiparameter sensitivity and robustness against noise.
  • Nonlocal evolution in MAI provides distinct advantages.
  • MAI protocols achieve Heisenberg scaling for spin-squeezed states, especially with non-Gaussian states.
  • Standard linear measurements are insufficient for certain non-Gaussian states.

Conclusions:

  • MAI strategies offer a powerful approach to overcome limitations in multiparameter quantum estimation.
  • These protocols demonstrate superior performance, particularly in noisy environments and with complex quantum states.
  • The findings are applicable to current experimental platforms like atomic ensembles and optical fields.