2019/10/09 by Jonathan Lavoie, Tiemo Landes, Lavoie, Jonathan +9 · 2 citations
Engineering · Physics and Astronomy · #Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Mechanical and Optical Resonators #Photonic and Optical Devices #Quantum Physics (quant-ph) #Quantum optics and atomic interactions
paper · pdf · doi:10.48550/arxiv.1910.04202
openalex publication_date 2019/10/09 · openalex created_date 2022/07/28 · openalex updated_date 2026/07/28
The authors demonstrate a form of two-photon-counting interferometry by\nmeasuring the coincidence counts between single-photon-counting detectors at an\noutput port of a Mach-Zehnder Interferometer (MZI) following injection of\nbroad-band time-frequency-entangled photon pairs (EPP) generated from collinear\nspontaneous parametric down conversion into a single input port. Spectroscopy\nand refractometry are performed on a sample inserted in one internal path of\nthe MZI by scanning the other path in length, which acquires phase and\namplitude information about the samples linear response. Phase modulation and\nlock-in detection are introduced to increase detection signal-to-noise ratio\nand implement a down-sampling technique for scanning the interferometer delay,\nwhich reduces the sampling requirements needed to reproduce fully the temporal\ninterference pattern. The phase-modulation technique also allows the\ncontributions of various quantum-state pathways leading to the final detection\noutcomes to be extracted individually. Feynman diagrams frequently used in the\ncontext of molecular spectroscopy are used to describe the interferences\nresulting from the coherence properties of time-frequency EPPs passing through\nthe MZI. These results are an important step toward implementation of a\nproposed method for molecular spectroscopy, i.e. quantum-light-enhanced\ntwo-dimensional spectroscopy.\n