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Regensburg 2022 – wissenschaftliches Programm

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SYPQ: High Yield Devices for Photonic Quantum Implementations

SYPQ 1: High Yield Devices for Photonic Quantum Implementations

SYPQ 1.1: Hauptvortrag

Dienstag, 6. September 2022, 09:30–10:00, H1

Designing driving protocols for high-fidelity quantum devices using numerically exact predictions — •Moritz Cygorek and Erik M. Gauger — Heriot-Watt University, Edinburgh, UK

Improving the quality of quantum devices, such as solid state quantum dots as emitters of non-classical light, is not only a matter of device fabrication. Engineering operation protocols by combining coherent driving, adiabatic rapid passage, Stark tuning, and phonon-assisted state preparation is key to enhancing devices robustness and fidelity. This turns a hardware problem into the software problem of predicting the dynamics of quantum devices. The challenge for solid state devices is the simultaneously strong coupling to phonon environments, strong time-dependent driving, and possibly strong interactions with structured photonic environments. After a series of conceptual developments in less than a decade, it has become possible to describe the dynamics of such devices numerically exactly, i.e., to fully account for all effects described by the microscopic Hamiltonians to arbitrary precision. While prior numerically exact methods had been practicable only for very small idealised quantum systems, now, easy-to-use computational tools are publicly available that provide numerically exact results even for the multi-scale dynamics of small quantum networks strongly coupled to multiple environments with long memory times. Here, I summarise these developments and discuss their impact for the design of driving protocols for real-world quantum device. Furthermore, I discuss the prospects and challenges for a universal solver of arbitrary open quantum systems.

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