All day
Place: Instituto de Física, UNAM (México)
Carlos Pineda (UNAM)
"From Microscopic to Macroscopic: Tracking Quantum Dynamics through Coarse Graining"
Abstract:
How does a complex quantum system look when we only keep part of the information? In this talk, I’ll explore what happens when we describe quantum many-body systems through coarse graining—that is, when we simplify their description by grouping together microscopic details. Starting from a coarse-grained map, we build its inverse using the maximum entropy principle, which lets us reconstruct a plausible microscopic state from limited information.
Assuming that the microscopic world evolves unitarily, we then ask: what kind of dynamics emerge at the coarse-grained level? To answer this, we study simple examples, such as two qubits evolving under SWAP and CNOT gates, as well as larger systems—Ising chains and models with all-to-all interactions. Surprisingly, we find that the resulting effective dynamics can behave in unexpected ways: they may be nonlinear, non-Markovian, and even depend on the initial coarse-grained state.
Finally, I’ll discuss under what conditions this effective evolution remains linear and how these results shed light on the quantum-to-classical transition. The goal is to show how coarse graining can change our perspective on what “quantum dynamics” really means at different levels of description.
Bio:
Carlos Pineda is an Associate Professor at the Instituto de Física, UNAM. He obtained his physics degree with honors from the Universidad Nacional de Colombia and later completed his MSc and PhD at UNAM, receiving the Alfonso Caso Medal for his doctoral work. After a postdoctoral stay with Jens Eisert at the University of Potsdam, he joined the Instituto de Física, where he founded the Quantum Information and Optics Group in 2011.
His research focuses on quantum information, with interests that extend to quantum optics, many-body systems, decoherence and Loschmidt echoes, spin chains, and complex classical dynamics. He has published over 50 papers in high-impact journals, including Phys. Rev. Lett., Nature Communications and Scientific Reports, with more than 1000 citations. He has delivered numerous invited talks worldwide, including at Harvard University, and actively contributes to the organization of international scientific meetings.
All day
Place: Instituto de Física, UNAM (México)
Carlos Pineda (UNAM)
"From Microscopic to Macroscopic: Tracking Quantum Dynamics through Coarse Graining"
Abstract:
How does a complex quantum system look when we only keep part of the information? In this talk, I’ll explore what happens when we describe quantum many-body systems through coarse graining—that is, when we simplify their description by grouping together microscopic details. Starting from a coarse-grained map, we build its inverse using the maximum entropy principle, which lets us reconstruct a plausible microscopic state from limited information.
Assuming that the microscopic world evolves unitarily, we then ask: what kind of dynamics emerge at the coarse-grained level? To answer this, we study simple examples, such as two qubits evolving under SWAP and CNOT gates, as well as larger systems—Ising chains and models with all-to-all interactions. Surprisingly, we find that the resulting effective dynamics can behave in unexpected ways: they may be nonlinear, non-Markovian, and even depend on the initial coarse-grained state.
Finally, I’ll discuss under what conditions this effective evolution remains linear and how these results shed light on the quantum-to-classical transition. The goal is to show how coarse graining can change our perspective on what “quantum dynamics” really means at different levels of description.
Bio:
Carlos Pineda is an Associate Professor at the Instituto de Física, UNAM. He obtained his physics degree with honors from the Universidad Nacional de Colombia and later completed his MSc and PhD at UNAM, receiving the Alfonso Caso Medal for his doctoral work. After a postdoctoral stay with Jens Eisert at the University of Potsdam, he joined the Instituto de Física, where he founded the Quantum Information and Optics Group in 2011.
His research focuses on quantum information, with interests that extend to quantum optics, many-body systems, decoherence and Loschmidt echoes, spin chains, and complex classical dynamics. He has published over 50 papers in high-impact journals, including Phys. Rev. Lett., Nature Communications and Scientific Reports, with more than 1000 citations. He has delivered numerous invited talks worldwide, including at Harvard University, and actively contributes to the organization of international scientific meetings.