CQE IBM Postdoctoral Candidate talk
Abstract: Quantum key distribution (QKD) enables unconditionally secure communication
between multiple parties. Compared to binary-encoding, a high-dimensional QKD
system can benefit both the secure information encoded per photon and the
robustness against eavesdropping. The orbital angular momentum (OAM) degree of
freedom is one potential candidate for high-dimensional encoding. Here, we
investigate the possibility of achieving long-distance high-dimensional OAM QKD in
free-space communication links, which has a lower loss and more flexibility than fiber
links. The investigation of optimal information carrier, potential secure loophole and the
mitigation of atmospheric turbulence will be discussed.
Terahertz (THz) hyperspectral imaging, which provide rich spatial and spectral
information, is a powerful tool for security detection, flaw detection and biomedical
sensing. However, due to the lack of efficient cameras in the THz band, characterizing
the spatio-temporal structure of THz pulses usually depends on raster scanning the
transverse and longitudinal degree of freedoms. Here, by encoding the probe beam in
the spatial and time domain, we propose and develop single-pixel spatial and temporal
imaging techniques to characterize THz pulses. Through the combination of two
techniques, we can perform THz hyperspectral imaging efficiently and accurately at a
better SNR.
Jiapeng Zhao got his Bachelor degree from Huazhong University of Science and
Technology in 2014. After finishing the master program in 2015 at the University of
Rochester, he started his Ph.D. program under the supervision of Dr. Robert Boyd.
For more information or the zoom link, email quantum@uchicago.edu.
