Harvard John A. Paulson School of Engineering and Applied Sciences EE Seminars Please join us at SEC 1.413 or Zoom<https://urldefense.proofpoint.com/v2/url?u=https-3A__harvard.zoom.u… Upcoming Seminar: Nikolai Matni What makes learning to control easy or hard? 11/04/22<https://events.seas.harvard.edu/event/what_makes_learning_to_co… Friday, October 28th at 11am ET Davi Geiger, Professor, Courant Institute of Mathematical Sciences and of Neural Science, New York University. "Spin and Qubit Entropy<https://events.seas.harvard.edu/event/spin_and_qubit_entropy>… Abstract: Quantum physics, in its current formulation, is time reversible. We propose a definition of quantum entropy for the spin and the qubit variables, accounting for the uncertainty in the specification of a quantum state and the probabilistic nature of its observables. It is rooted in the geometric quantization of the spin. This entropy overcomes the limitations of previously-proposed entropies, such as von Neumann entropy which is restricted to quantify the randomness of specifying the quantum state. As an example of a limitation, previously-proposed entropies are higher for Bell entangled spin states than for disentangled spin states, even though the spin observables are less constrained for a disentangled pair of spins than for an entangled pair. The proposed entropy accurately quantifies the randomness of a spin or a qubit state, it is lower for entangled states than for disentangled states, and its minimum is positive. We suggest that the proposed entropy must always increase over time, so that the randomness of a closed physical system cannot be reduced, thus creating a time arrow for quantum physics. Speaker bio: Davi Geiger is an Associate Professor of Computer Science at the Courant Institute of Mathematical Sciences and of Neural Science, New York University. He is also a CoFounder of Kooick.ai and Nhega.com. He received the BS in Physics at PUC Rio de Janeiro, Brasil the Ph.D in Physics and Artificial Intelligence at MIT with Professor Tomaso Poggio. Before coming to NYU, he spent three years at Siemens Corporate Research in Princeton. He has received an NSF Career award. His interests include Computer Vision, Machine Learning, Artificial Intelligence, Quantum Physics and Quantum Field Theory. Host: Woodward Yang _______________________________________________ Harvard-quantum-initiative mailing list -- harvard-quantum-initiative(a)lists.fas.harvard.edu To unsubscribe send an email to harvard-quantum-initiative-leave(a)lists.fas.harvard.edu