Information scrambling and quantum advantage in quantum simulation

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• Andrew Daley (Oxford)
• Wednesday 13 November 2024, 16:00-17:00
• Small Lecture Theatre, Cavendish Laboratory, J.J. Thomson Avenue.

If you have a question about this talk, please contact Lucas Sá.

There has been impressive recent progress in controlling many-particle quantum systems, ranging from superconducting qubits to neutral atoms in tweezer arrays. In the applications of these systems to both quantum metrology and quantum simulation, there are important questions around how large an entangled many-body state we can usefully and reliably prepare in the presence of decoherence. Entanglement growth is typically limited by Lieb-Robinson bounds on how fast information can spread, so that the useful system size with short-range interactions will grow only linearly with the coherence time of the system. However, for systems with long-range interactions (e.g., atoms in cavities) or movable tweezer arrays, we can engineer so-called fast scrambling dynamics, where information is spread and entanglement is built up on a timescale that grows logarithmically with the system size. I will give an introduction to these ideas and to some of our recent studies of quantum information scrambling, including how transitions to so-called fast scrambling can be observed in neutral atom arrays, with applications in generating useful entangled states for metrology. I will also discuss how this relates to questions of when analogue devices can be quantitatively reliable and operating in regimes that are inaccessible to conventional supercomputers.

This talk is part of the Cavendish Quantum Colloquium series.

This talk is included in these lists:

• All Cavendish Laboratory Seminars
• Cavendish Quantum Colloquium
• Centre for Health Leadership and Enterprise
• Featured lists
• ME Seminar
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• School of Physical Sciences
• Small Lecture Theatre, Cavendish Laboratory, J.J. Thomson Avenue
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