Time: 15:00 pm, May 20th, 2021

Speaker:  Dr. Kai-Hong Luo, Integrated Quantum Optics, Paderborn University, Germany

Abstract:

Photonic quantum systems, which comprise multiple optical modes as well as highly non-classical and sophisticated quantum states of light, have been investigated intensively in various theoretical proposals over the last decades. The ideas cover a large range of different applications in quantum technology, spanning from quantum communication and quantum metrology to quantum simulations and computing. However, the experimental implementations require advanced setups of high complexity, which pose a considerable challenge. The successful realization of controlled quantum network structures is crucial for the future advancement of the field.

Here we present three different areas where current limitations must be overcome for practical quantum implementation: technology, devices and networks. First, in a technology breakthrough, we have achieved counter-propagating phase matching; single photon pairs have been generated around 1.5 µm in a periodically poled nonlinear waveguide with short poling periods of 1.7 µm [1]. Secondly, nonlinear integrated quantum devices with multiple channels have been fabricated that enable the combination of different functionalities, such as sources and fast electro-optic modulation, in a single compact monolithic structure [2].  Thirdly, quantum interferometry based on metasurface nanoarchitecture as a versatile tool for the implementation of hybrid quantum sensors has been demonstrated with miniaturized control of the wave-front and propagation properties [3].

Reference:

[1] Kai-Hong Luo,* Vahid Ansari, Marcello Massaro, Matteo Santandrea, Christof Eigner, Raimund Ricken, Harald Herrmann, Christine Silberhorn, Counter-propagating photon pair generation in a nonlinear waveguide, Optics Express 28, 3215-3225 (2020).

[2] Kai-Hong Luo,* Sebastian Brauner, Christof Eigner, Polina R Sharapova, Raimund Ricken, Torsten Meier, Harald Herrmann, Christine Silberhorn, Science Advances 5, eaat1451 (2019).

[3] Philip Georgi,† Marcello Massaro,† Kai-Hong Luo,† Basudeb Sain, Nicola Montaut, Harald Herrmann, Thomas Weiss, Guixin Li, Christine Silberhorn, Thomas Zentgraf,* Metasurface interferometry toward quantum sensors, Light: Science & Applications 8, 1-7 (2019).

Brief CV of Dr. Kai-Hong Luo:

Dr. Kai-Hong Luo obtained her Ph.D. from the Institute of Physics, CAS in 2011 under the supervision of Prof. Ling-An Wu and Prof. Panming Fu. After graduation, she joined the integrated quantum optics group headed by Prof. Christine Silberhorn at Paderborn University in Germany. Her main research focuses on understanding the behavior of photons along integrated nonlinear quantum circuits, and its applications in integrated quantum imaging, sensing, metrology and spectroscopy.