Applications of femtosecond pulse engineering in the control of excitons in quantum dots

Reuble Mathew; Angela Gamouras; Eric Dilcher; Ajan P. Ramachandran; Hong Yi Shi Yang; Sabine Freisem; Dennis G. Deppe; Kimberley C. Hall

doi:10.1117/12.2064789

28 August 2014 Applications of femtosecond pulse engineering in the control of excitons in quantum dots

Reuble Mathew, Angela Gamouras, Eric Dilcher, Ajan P. Ramachandran, Hong Yi Shi Yang, Sabine Freisem, Dennis G. Deppe, Kimberley C. Hall

Author Affiliations +

Proceedings Volume 9167, Spintronics VII; 916705 (2014) https://doi.org/10.1117/12.2064789
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

Abstract

Pulse shaping techniques are used to demonstrate quantum control of exciton qubits in InAs quantum dots. Linearly chirped laser pulses are used to demonstrate adiabatic rapid passage in a single quantum dot on a subpicosecond timescale. The observed dependence of the exciton inversion efficiency on the sign of the pulse chirp identifies phonons as the dominant source of dephasing, which can be suppressed for positive chirp at low temperatures. The use of optimal quantum control theory to engineer a single optical pulse to implement simultaneous π and 2π single qubit gates in two uncoupled quantum dots is demonstrated. This work will support the use of pulse shaping in solid-state quantum hardware.

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Reuble Mathew, Angela Gamouras, Eric Dilcher, Ajan P. Ramachandran, Hong Yi Shi Yang, Sabine Freisem, Dennis G. Deppe, and Kimberley C. Hall "Applications of femtosecond pulse engineering in the control of excitons in quantum dots", Proc. SPIE 9167, Spintronics VII, 916705 (28 August 2014); https://doi.org/10.1117/12.2064789

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