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Photon Detection and Generation by Superconductor and Semiconductor Nanostructures


The generation, manipulation, control and detection of quantum states of lights such as single and entangled photons are at the heart of quantum photonics. The integration and combination of single photon sources, passive optical circuits and single photon detectors are key enabling technology for two main reasons; first, it provides a feasible route toward scalable quantum photonic processors that are genuinely useful in practical applications and form "quantum-optics-lab-on-a-chip" and second, it enables building more complicated devices such as quantum amplifiers, repeaters and transceivers that are necessary for some applications such as quantum communication networking.

After a brief introduction to various technologies for single photon detectors and sources, I will focus on our research work on two key-elements of integrated quantum photonics, namely Superconducting Nanowire Single Photon Detector (SNSPD) and III-V NanoWire Quantum Dot (NWQD) single and entangled photon sources.

In SNSPD part, I will focus on quantum tomographic characterization of SNSPD and introduce our original contribution on how gated SNSPD increase the detection speed by an order of magnitude. In NWQD part, I will present the results for the first demonstration of polarization-entangled photon generation from a single InAsP quantum dot embedded in an InP nanowire in collaboration with Philip Poole's group at NRC and Gregor Weihs's group at University of Innsbruck. At the end, I will introduce the challenges and our ongoing attempts to integrate these two devices on a single chip.