Main menu


Quantum Control for Advanced Technologies: Past and Present


Credit: Pixabay/CC0 Public Domain

One of the cornerstones of implementing quantum technologies is the creation and manipulation of external field shapes that can optimize the performance of quantum devices. This set of methods, known as quantum optimal control, constitutes a rapidly evolving and expanding field in recent years.

New review paper published in EPJ quantum technology Authored by Christiane P. Koch of the Dahlem Center for Complex Quantum Systems and Fachbereich Physik, the Free University of Berlin, together with colleagues across Europe, has made recent progress in understanding the controllability of quantum systems and applying quantum control to quantum technology. Evaluate the progress of As such, it represents a potential roadmap for future technologies.

Quantum optimal control builds on classical control theory, including interfaces with applied mathematics, engineering, and physics, but it must also take into account the quirks and counterintuitive nature of quantum physics.

This includes superposition, the notion that a quantum system can exist in multiple states at once. This is one of the keys to the advanced computational power of machines that rely on quantum bits (qubits).

Ultimately, the main goal of quantum optimal control is to make new quantum technologies operate at optimal performance and reach their physical limits.

“Each device architecture has certain limitations, and these limitations are often not achievable with traditional ways of operating the device,” says Koch. “Using pulse shaping basically has the potential to push the device to its limits in terms of possible accuracy or speed of operation.”

The authors of this review consider factors in the field, such as the extent to which quantum systems can be established, controlled, and observed without disrupting this superposition, a serious hindrance to the stability of quantum computers.

The review also notes that just as conventional engineers have a reliable control theory framework, training future ‘quantum engineers’ may require similar frameworks that have yet to be developed. also suggests.

Quantum systems that integrate theory and experiment are one of the current research goals in the field, and the authors point out that this is also the basis for developing optimal control strategies.

In addition to assessing recent progress towards this goal, the team identified some potential roadblocks ahead in this area. For the future of quantum technology to become clear, there are obstacles that must be overcome.

Quantum phenomenon speed limits extended to macro-sized objects

For more information:
Christiane P. Koch et al., Quantum Optimal Control in Quantum Technology. A strategic report on the current state, vision and goals of research in Europe, EPJ quantum technology (2022). DOI: 10.1140/epjqt/s40507-022-00138-x

Quote: Quantum Control for Advanced Technologies: Past and Present (08/01/2022) Retrieved 08/01/2022 from

This document is subject to copyright. No part may be reproduced without written permission, except in fair trade for personal research or research purposes. Content is provided for informational purposes only.