Ece462 yashashree

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Information about Ece462 yashashree

Published on May 19, 2016

Author: YashashreeWase



1. Quantum Computer Aided Design Simulation and Optimization of Semiconductor Quantum Dots Presented by Yashashree Wase Graduate Student in Electrical and Computer Engineering Contact: 5/19/2016 2:58 AM 1

2. Outline • Glossary of Terms • Introduction to QCAD • QCAD simulator code structure • Three core physical solvers • Application examples • Summary 5/19/2016 2:58 AM 2

3. Glossary • Qubit: Unit of quantum information in quantum computing. Superposition of 0s and 1s at the same time • Quantum dots (QD): Physical(energy) confinement to get atomic-like structure. Artificial atom. QDs are much more flexible than atoms. • Double quantum dots (DQD): Two lateral quantum dots coupled in series to avoid the effect of background spins 5/19/2016 2:58 AM 3

4. Quantum Computer Aided Design (QCAD) • Challenges in modeling QDs • QCAD simulator targets modeling multi-dimensional quantum devices developed for qubit application. • It is integrated open-source finite-element-based tool • Simulate experimental QDs to provide feedback and guidance for experiment. 5/19/2016 2:58 AM 4

5. QCAD Code Structure 5/19/2016 2:58 AM 5 Source: Gao, X. and Nielsen, E. and Muller, R. P. and Young, R. W. and Salinger, A. G. and Bishop, N. C. and Lilly, M. P. and Carroll, M. S., Quantum computer aided design simulation and optimization of semiconductor quantum dots, Journal of Applied Physics, 114, 164302 (2013) •Easy scripting ability •Solves set of equations •Extended problem space •High simulation throughput •Parallel computing

6. QCAD Core 5/19/2016 2:58 AM 6

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8. QD Capacitance • QCADs ability to compute the capacitance between a quantum dot and a control gate • Constraint one electron in a dot 5/19/2016 2:58 AM 8

9. DQD Optimization • QCADs ability to asses and improve upon the design of nano-scale devices 5/19/2016 2:58 AM 9

10. Summary • QCAD software tool developed enables design comparison and guidance for semiconductor quantum dot devices • High throughput of simulations through scripting, automated meshing and web portal allows fast feedback to experimentalist • Self-consistent quantum models in QCAD allows for analysis of quantum effects on device behavior (cap.etc) 5/19/2016 2:58 AM 10

11. Thank you! Your questions are valuable! 11May 19, 2016

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