Quantum Optics Seminar by Prof. Fujiwara – University of Copenhagen

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Quantum Optics Seminar by Prof. Fujiwara

Quantum nanophotonics based on fiber tapers

I will talk about our activity for the development of nanophotonic devices that utilize fiber tapers. Future quantum networks should be hybrid quantum systems, where for example photons are used for transmitting quantum information and quantum two-level systems (TLSs) for information processing and storage. Quantum TLSs therefore need to be efficiently integrated into nanophotonic waveguides or optical fibers. Fiber tapers can provide efficient quantum interfaces where photons guided in fibers are loss-lessly confined in the sub-wavelength region and interacted with quantum TLSs placed in the E-field confined area. We use colloidal quantum dots and diamond nitrogen vacancy centers as quantum TLSs. In addition, I talk about my current on-going research that uses fiber tapers as single-mode `thermal light sources’ for applications in photosynthesis research in order to exchange ideas. 

[1] Fujiwara et al., Nanotechnology 27, 455202 (2016).
[2] Schell et al., Sci. Reports 5, 9619 (2015).
[3] Fujiwara et al., Nano Lett. 11, 4362 (2011).
[4] Fujiwara et al., Opt. Express 19, 8596 (2011).
[5] Fujiwara et al., Phys. Rev. B 77, 205118 (2008). 

Masazumi Fujiwara received B.S., M.S., and Ph. D. from Osaka City University in 2004, 2006, and 2008, respectively.He worked as Assistant professor at Hokkaido University (2009-2013), AvH Humboldt Research Fellow at Humboldt University of Berlin (2013-2015), and Assistant professor at Kwansei Gakuin University (2015-2016).

Since the last year, he has been appointed to Lecturer at Osaka City University and has started his new group. He was awarded the JSPS PhD fellowship (2007-2008), Masao-Horiba-Award(2015) and Fellow of Leading Initiative for Excellent Young Researchers of Japanese government (2016). His current research interest is application of quantum nano-optics and quantum sensing for chemical or biological instrumentation. 

Selected Publications:

Nanotechnology 27, 455202 (2016).
Sci. Reports 5, 9619 (2015).
Nano Lett. 11, 4362-4365 (2011).
Opt. Express 19, 8596-8601 (2011).
Phys. Rev. B 77, 205118 (2008).