Interferometric quantum spectroscopy with undetected photons via distinguishability modulation

Sun Kyung Lee, Tai Hyun Yoon, Minhaeng Cho

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Quantum spectroscopy with undetected photons (QSUP) utilizing the quantum entanglement of parametrically down-converted photons has emerged as a new spectroscopic platform. Here, we demonstrate a high-resolution and remote-measurement QSUP, where light-matter interactions and photon detections are performed in spectrally and spatially different regions. A dual-stimulated parametric down-conversion scheme with an optical frequency-comb pump and ultra-narrow coherent seed beam in an idler mode is used to generate path-entangled pairs of the undetected idler and measured frequency-comb signal photons. To demonstrate the frequency resolution of this scheme, a Fabry-Pérot cavity with a narrow bandwidth is used as a sample that modulates the distinguishability of one-photon-added coherent idler beams, which directly affects the interference fringe visibility of the entangled signal photons. We thus anticipate that the remote QSUP whose frequency resolution is determined by the linewidth of the coherent seed laser will enable the development of quantum spectroscopy featuring high resolution.

Original languageEnglish
Pages (from-to)14853-14870
Number of pages18
JournalOptics Express
Issue number10
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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