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(July 10th) ‘Chip-scale single photon devices for scalable quantum computing


Chip-scale single photon devices for scalable quantum computing


2019.07.10 (Wed) 16:30


Dr. Young-Ik Sohn (Research and Development Engineer, PsiQ)


E3-2, Room 2203


With recent progress in hardware and error correction algorithm for quantum computer, full implementation of the machine has become a realistic goal. Across almost all quantum computing platforms, single photon production and entanglement is necessary for scalable architecture.

Among many single photon systems, solid-state quantum emitters have been extensively studied for its robustness and scalability. These benefits come from the fact that atomic-sized object is trapped inside the solid host, however, the very same feature imposes inevitable challenges as well. Every quantum emitter residing in the crystal sees slightly different environment due to local strain variation, nearby defects, and etc. Furthermore, thermal phonon bath can cause random fluctuations to the system unless the temperature is absolute zero.

In the seminar, engineering the property of silicon vacancy (SiV) color center in the diamond crystal using Micro-electro-mechanical systems (MEMS) is presented. SiV is an emerging quantum emitter due to its desirable features such as bright zero phonon line, spectral stability, and small inhomogeneous distribution. In this work, MEMS device is used to spectrally align multiple emitters as well as to increase emitter’s spin coherence time. Potential route for further scaling is also discussed.

In addition, the concept of quantum photonics is briefly covered as an alternative platform for single photon generation and quantum computation.


Dr. Young-Ik Sohn is a Research and Development Engineer at a quantum computing startup PsiQ. He has received B.S. and M.S. from Seoul National University and Stanford University, respectively, both in Electrical Engineering. In 2018, he has received Ph.D. in Applied Physics from Harvard University by applying micro-electro-mechanical systems (MEMS) to solid-state quantum emitters in diamond. After Ph.D., he has joined PsiQ as a hardware engineer to develop quantum computer based on photonics. He has many years of experience in nano-mechanical and nano-photonic device engineering for quantum systems.