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Prof. Anupam Madhukar: Quantum Dot Arrays: A Route to Scalable Quantum Optical Circuits? (2017/12/06)

( 2017-11-27 )

Title

Quantum Dot Arrays: A Route to Scalable Quantum Optical Circuits?

Speaker

 

Prof. Anupam Madhukar

Nanostrucutre Materials and Devices Laboratory

University of Southern California, USA          

  

Time

10:00am, December 6, 2017

Place

Room 9004 at the HFNL building

Brief Bio of the Speaker

Anupam Madhukar is the Kenneth T. Norris Professor of Engineering at the University of Southern California. He heads the Nanostructure Materials & Devices Lab and carries out multi-disciplinary research with a focus on the synthesis and study of quantum nanostructures aimed at electronic, optoelectronic, & photonic systems for information sensing (including biochemical & biological), processing, and communication down to single photon level in quantum optical circuits.

Abstract

On-chip integrated and scalable quantum optical circuits, if realized, offer a breakthrough in the science and technology of quantum information processing. So far epitaxical semiconductor quantum dots, predominantly of the lattice mismatch strain-driven 3D coherent island genre, have provided a relatively easily accessed platform for exploration of many aspects of needed single photon generation, and their coupling to light manipulating elements (LMEs) such as resonant cavity and / or waveguide. However the as-grown 3D island quantum dots are at random spatial locations and suffer from size, shape, and composition inhomogeneity and have thus prevented steps towards realizing optical circuits. In this talk I will discuss a promising approach to synthesizing single quantum dots (SQDs) at spatially regular locations with control on spectral uniformity potentially to a level where local tuning may enable the needed spectral matching for emitted photon interference and entanglement. The approach, dubbed substrate-encoded size-reducing epitaxy (SESRE), involves spatially-selective growth of single quantum dots on the top of nanoscale mesas in a regular array. The SESRE based SQDs are demonstrated to be highly efficient single photon emitters. Additionally, for the needed on-chip LMEs, I will present an implementation approach based upon the collective Mie resonances of sub-wavelength size interacting dielectric building blocks (DBBs) organized around the SQDs in geometries co-designed to provide the needed multiple functions of cavity induced emission rate enhancement, directivity of the emitted photons, lossless propagation, and beam splitting utilizing a single mode of the DBB structure we call a light manipulating unit (LMU).


Seminar
 
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Links
 
CopyRight@International Center for Quantum Eesign of Functional Materials
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