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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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On-chip quantum states generation by incoherent light.

Yue-Wei Song1,2, Heng Zhao1,2,3, Li Chen1,2

  • 1Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, China.

Nature Communications
|December 11, 2025
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Summary
This summary is machine-generated.

Incoherently pumped quantum sources enhance photon generation efficiency and purity. This study demonstrates a novel method for creating high-quality quantum states using easily accessible incoherent light, advancing integrated photonics.

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Area of Science:

  • Integrated photonics
  • Quantum information technologies
  • Nonlinear optics

Background:

  • On-chip quantum sources are vital for quantum information technologies.
  • Pump coherence is traditionally considered essential for state quality.
  • Incoherent light is rarely utilized in quantum information processing.

Purpose of the Study:

  • To explore the impact of temporal incoherence on quantum photon sources.
  • To demonstrate the constructive influence of incoherent pumping.
  • To present a practical method for generating quantum states using incoherent light.

Main Methods:

  • Theoretical analysis using silicon waveguides for spontaneous four-wave mixing.
  • Experimental generation of photon pairs using an Amplified Spontaneous Emission source.
  • Characterization of generated states via second-order autocorrelation and Bell inequality tests.

Main Results:

  • Incoherent pumping improves pump utilization efficiency and source brightness.
  • Reduced spectral correlations from incoherent light lead to higher state purity.
  • Achieved higher photon pair generation rate, lower autocorrelation, and a polarization-entangled state with Bell violation (S = 2.64 ± 0.02) and high fidelity (95.7% ± 0.1%).

Conclusions:

  • Temporal incoherence constructively influences quantum properties of photon sources.
  • Incoherently pumped sources offer advantages in brightness and state purity.
  • This work presents a viable method for generating quantum states with accessible incoherent light sources.