Molecular vibration spectroscopy with undetected photons

Tai Hyun Yoon, Sun Kyung Lee, Minhaeng Cho

Research output: Contribution to journalConference articlepeer-review


We present a novel technique of molecular vibration spectroscopy with undetected photons (MSUP) with dual stimulated parametric down-conversion crystals. In our MSUP, quantum coherence between independent signal photons is induced by the path indistinguishability of the conjugate idler single-photon-added coherent states and results in perfect visibility under the same pump and seed beam intensities. If the seed beam intensity is imbalanced by the sample absorption, the modulated interference fringe reveals the absorption spectrum as a function of seed beam frequency. As a proof-of-principle experiment, a rovibrational absorption spectrum of hydrogen cyanide (H13C14N) molecules in a gas cell at approximately 1550 nm is successfully measured by analyzing the single-photon interference fringe of the signal field at 807 nm.

Original languageEnglish
Article numberQTu8B.18
JournalOptics InfoBase Conference Papers
Publication statusPublished - 2020
EventOSA Quantum 2.0 Conference, QUANTUM 2020 - Virtual, Online, United States
Duration: 2020 Sept 142020 Sept 17

Bibliographical note

Publisher Copyright:
© OSA 2020.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials


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