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Photonics North (PN)

Quantum Control of Decoherence in Solid State Emitters using Femtosecond Pulse Shaping

Kimberley C. Hall, A. Ramachandran, Grant R. Wilbur, Sabine O’Neal, DENNIS GLENN DEPPE

Published May 31, 2021• 0 citations
Publisher

Abstract

We report the demonstration of suppression of decoherence tied to electron-phonon coupling in telecom-compatible semiconductor quantum dots (QDs) through adiabatic rapid passage in the strong driving regime.
DOI
10.1109/pn52152.2021.9597938

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Abstract Femtosecond pulse shaping provides a means to tailor the interaction of light with matter, enabling the optimization of optical control processes and the achievement of a target final quantum state of the matter system. While this approach has found widespread application in the control of atomic and molecular systems, its use for solid state quantum systems remains in its infancy. This review covers our application of this approach to the manipulation of the quantum states of excitons in semiconductor quantum dots (QDs). The achievement of simultaneous π, 2π rotations on excitons in two different QDs using a single engineered infrared pulse illustrates the flexibility of the pulse shaping approach for solid state quantum systems. This versatility is further explored through simulations that show the feasibility of arbitrary SU(2) control of several quantum dots. Shaping of femtosecond infrared control pulses enables the demonstration of adiabatic rapid passage in a single QD on a subpicosecond time scale, representing a substantial speedup and an important step towards the realization of dynamical decoupling. The dependence of the exciton inversion efficiency on the sign of pulse chirp confirms the role of (and ability to control) phonon‐related dephasing. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)