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.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon