4.8 Article

Measuring the Joint Spectral Mode of Photon Pairs Using Intensity Interferometry

期刊

PHYSICAL REVIEW LETTERS
卷 128, 期 2, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.023601

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资金

  1. Engineering and Physical Sciences Research Council [P510257]
  2. H2020 Marie Sklodowska-Curie Actions [846073]
  3. Korea Institute of Science and Technology open research program
  4. National Research Council of Canada
  5. Marie Curie Actions (MSCA) [846073] Funding Source: Marie Curie Actions (MSCA)

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The article presents a scheme for measuring the time-frequency structure of quantum light and demonstrates its effectiveness through experiments. The proposed method does not require phase stability, nonlinearities, or spectral shaping, making it a simple and practical way to measure the modal structure of quantum light.
The ability to manipulate and measure the time-frequency structure of quantum light is useful for information processing and metrology. Measuring this structure is also important when developing quantum light sources with high modal purity that can interfere with other independent sources. Here, we present and experimentally demonstrate a scheme based on intensity interferometry to measure the joint spectral mode of photon pairs produced by spontaneous parametric down-conversion. We observe correlations in the spectral phase of the photons due to chirp in the pump. We show that our scheme can be combined with stimulated emission tomography to quickly measure their mode using bright classical light. Our scheme does not require phase stability, nonlinearities, or spectral shaping and thus is an experimentally simple way of measuring the modal structure of quantum light.

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