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Quantum Nanoparticles and Nanophotonic Devices for Quantum Information Technology

Fluorescent nanoparticles, such as fluorescent nanodiamonds and quantum dots, are essential for developing quantum information devices. These nanoparticles are stable and exhibit bright fluorescence, which even allows us to detect the presence of single nanoparticles. At the single-particle level, they behave like single atoms or molecules, exhibiting quantum properties in their optical emission and absorption and are therefore referred to as solid-state quantum two-level systems. To efficiently exploit their quantum properties, these two-level systems need to be integrated into nanophotonic devices that are fabricated using precise nanotechnology. For example, we previously reported nanodevices such as optical nanofibers and microwave guides [1-3]. By integrating solid-state two-level quantum systems with these nanophotonic devices, it is possible to extract emitted photons or achieve strong light-matter interactions that cannot be achieved using conventional optical microscopy. Such nanophotonic devices are expected to become increasingly important in future quantum computing and quantum information technologies. We believe that these nano-optical devices can also be used for other applications, such as chemical sensors [4].


[1] Fujiwara et al., Nano Lett. 11, 4362 (2011).

[2] Fujiwara et al., Opt. Lett. 40, 5702 (2015).

[3] Fujiwara et al., ACS Omega 2, 7194-7202 (2017).

[4] 藤原,2015堀場雅夫賞受賞論文解説. (Japanese Review).