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Curated by: Qiskit (180 videos)
Dynamics of Magnetization at Infinite Temperature in a Heisenberg Spin Chain | Qiskit Quantum Seminar Hosted by Maria Violaris Episode 136 https://arxiv.org/abs/2306.09333 https://quantumai.google/cirq/experiments/kpz/kpz Please feel free to join our public Slack workspace to continue the conversation: http://qisk.it/join-slack Abstract: Understanding universal aspects of quantum dynamics is an unresolved problem in statistical mechanics. In particular, the spin dynamics of the 1D Heisenberg model were conjectured to belong to the Kardar-Parisi-Zhang (KPZ) universality class based on the scaling of the infinite-temperature spin-spin correlation function. In a chain of 46 superconducting qubits, we study the probability distribution, P(M), of the magnetization transferred across the chain's center. The first two moments of P(M) show superdiffusive behavior, a hallmark of KPZ universality. However, the third and fourth moments rule out the KPZ conjecture and allow for evaluating other theories. Our results highlight the importance of studying higher moments in determining dynamic universality classes and provide key insights into universal behavior in quantum systems. Bio: Eliott Rosenberg is a research scientist at Google Quantum AI. He earned his PhD in Physics from Cornell University in 2023, where he was co-advised by Paul Ginsparg and Peter McMahon. He also holds a Master’s degree in Physics from Cornell University and a Bachelor’s degree in Physics from Brown University. He recently completed a student researcher internship at Google Quantum AI, under the supervision of Pedram Roushan, which resulted in the paper presented here.