From Event: SPIE Commercial + Scientific Sensing and Imaging, 2017
We characterize an efficient and nearly-noiseless parametric frequency upconverter. The ultra-low noise regime is reached by the wide spectral separation between the input and pump frequencies and the low pump frequency relative to the input photons. The background of only ≈100 photons per hour is demonstrated. We demonstrate phase preservation in a frequency upconversion process at the single-photon level. We summarize our efforts to measure this ultra-low noise level, and discuss both single-photon avalanche photodiode measurements and a photon-counting transition edge sensor (TES) measurements. To reach the required accuracy, we supplemented our TES with a dark count reduction algorithm. The preservation of the coherence was demonstrated by simultaneously upconverting the input of each arm of a Mach-Zehnder interferometer through high interference fringe contrast. We observe fringe visibilities of ≥0.97 with faint coherent input.
Ivan A. Burenkov, Y.-H. Cheng, Tim Thomay, Glenn S. Solomon, Alan L. Migdall, Thomas Gerrits, Adriana Lita, Sae Woo Nam, L. Krister Shalm, and Sergey V. Polyakov, "Coherent quantum frequency bridge: phase preserving, nearly noiseless parametric frequency converter," Proc. SPIE 10212, Advanced Photon Counting Techniques XI, 1021204 (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 12, 2017; Published: 3 May 2017); https://doi.org/10.1117/12.2263562.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 12,000 conference presentations, including many plenary and keynote presentations.
Monte Carlo based light propagation models to improve efficacy of biophotonics based therapeutics of hollow organs and solid tumours including photodynamic therapy and photobiomodulation (Conference Presentation)