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McKelvey School of Engineering

Brown School

ESE Seminar: Dissertation Examination Yao Zhou

Thursday, December 17, 2020 | 2:00 PM - 4:00 PM

 In microscopic light-matter interaction, the dynamics has always been challenging to evaluate for few particle systems due to strong entanglement between photons and atoms, while such quantum nature generates interesting properties and nonlinearities that are essential for future quantum technologies. Even in a single photon picture, the simultaneous interaction with a series of quantum emitters coupled to waveguides and cavities or with atoms confined in free space causes drastically different quantum behaviors that are highly dependent on the spatial distribution of atoms. The atoms undergo cooperative spontaneous emission of different rates under such circumstances, resulting in controlled scenarios from subradiance dark state to superradiance ultra-strong couplingstate. On the other hand, when multi-photons interact with atoms (or artificial atoms), the dynamics is highly nonlinear and strong entanglement can be generated among the photons. Such a process is essential for many quantum techniques such as quantum computing and quantum imaging. Fortwo-photon microscopic quantum imaging, the absorption process of a same-parity two level atomvia transient intermediate states yields huge difference in its efficiency to many orders of magnitude with respect to different input two-photon entanglement. Among many different entangled states, photonic dimers, a type of two photon bound state, shows extraordinary efficiency in exciting such nonlinear absorption. For the generation of photonic dimers, it is found that a strongly pumped two-photon transition gain medium is promising in producing coherent state of photonic dimers that is an ideal stable source for many nonlinear two-photon applications.

Event Type

Research

Schools

McKelvey School of Engineering

Topic

Science & Technology

Department
Electrical & Systems Engineering
Speaker Information

Yao Zhou
PhD Candidate
Wsahington University in St. Louis 

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