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Information Scrambling, Error Propagation, and Quantum Advantage in Quantum Simulators

Qiskit Seminar Series with Andrew Daley Information Scrambling, Error Propagation, and Quantum Advantage in Quantum Simulators Your formal invite to weekly Qiskit videos ► https://ibm.biz/q-subscribe Speaker: Andrew Daley Host: Zlatko Minev, PhD. Abstract: With progress towards quantum advantage for problems designed to test the quantum hardware, there is increasing focus on when we will observe a practical quantum advantage for relevant problems with applications in science or industry. Simulating quantum many-body dynamics provides a particularly good test case, because for analogue quantum simulation this is both implemented in ongoing experiments, and challenging for classical calculations. The classical complexity is linked directly to the build up of entanglement, and scrambling of quantum information in these systems. For some quantum simulation platforms, we can also build microscopic models of the underlying processes, including noise and decoherence. This gives us a theoretical handle on how errors propagate, and allows us to analyse in which regimes the outcome of an analogue simulation will be reliable. I will compare our expectations for quantum advantage in current experiments with corresponding classical calculations, and also compare with the requirements for digital quantum computing in the same class of problems. As an outlook I will ask whether we can overcome decoherence limits to the useful size scale of quantum simulators, using long-range interactions and linking to the fast scrambling of quantum information. Bio: Andrew Daley is Professor of theoretical quantum physics at the University of Strathclyde in Glasgow, Scotland, and has made significant contributions to theory of quantum simulation, understanding of many-body open quantum systems, and the development of numerical methods for non-equilibrium many-body systems. He is originally from New Zealand, where he completed a Masters Degree at the University of Auckland in 2002, before moving to Innsbruck, where he completed his doctorate in 2005. After time in Innsbruck as a postdoc and senior scientist at Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, he took up a position as Assistant Professor at the University of Pittsburgh in 2011, before moving to Strathclyde as a Professor in 2013. He was elected a fellow of the American Physical Society in 2021 “for pioneering theoretical work on the boundary between quantum optics, many-body physics, and for experiments in both atomic, molecular, and optical physics and the solid state”.