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Journal of International Crisis and Risk Communication Research

Optimal Two-Qubit Quantum Control in InAs Quantum Dots

Angela Gamouras, Reuble Mathew, Sabine Freisem, DENNIS GLENN DEPPE, Kimberley C. Hall

Published Jan 1, 2013• 1 citation
Publisher

Abstract

Simultaneous control of exciton qubits in two distinguishable InAs semiconductor quantum dots with emission wavelengths near 1.3 microns is demonstrated through the development and application of general femtosecond pulse shaping protocols.
DOI
10.1364/cleo_qels.2013.qm4b.8

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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.