Colloquium- Matthew Fisher (UC Santa Barbara)- Quantum Many-body theory in the Quantum Information era

September 5, 2023

3:45PM - 4:45PM

1080 Physics Research Building

Add to Calendar 2023-09-05 15:45:00 2023-09-05 16:45:00 Colloquium- Matthew Fisher (UC Santa Barbara)- Quantum Many-body theory in the Quantum Information era Professor Matthew P.A. Fisher UC Santa Barbara Quantum Many-body theory in the Quantum Information era Location: 1080 Physics Research Building, Smith Seminar Room Faculty Host: Brian Skinner Abstract: Traditionally, quantum many-body theory has focused on ground states and equilibrium properties of spatially extended systems, such as electrons and spins in crystalline solids. In recent years \noisy intermediate scale quantum computers" (NISQ) have emerged, providing new opportunities for controllable non-equilibrium many-body systems. In such dynamical quantum systems the inexorable growth of non-local quantum entanglement is expected, but monitoring (by making projective measurements) can compete against entanglement growth. In this talk I will overview theoretical work exploring the behavior of \monitored" quantum circuits, which can exhibit a novel quantum dynamical phase transition between a weak measurement phase and a quantum Zeno phase, the former which we characterize in detail. Accessing such physics in the lab is challenged by the need for post-selection, which might be circumnavigated by decoding using active error correction. Bio: Matthew Fisher received his Ph.D. in theoretical physics from the University of Illinois at Urbana-Champaign in 1986, and went on to become first a Visiting Scientist and then a Research Staff Member at IBM T. J. Watson Research Center (1986-1993). Matthew joined the Kavli Institute for Theoretical Physics and the Physics Department of the University of California in 1993. In 2007 he joined Microsoft's Station Q as a research physicist. During the academic year 2009-2010 Matthew was on the faculty at Caltech, returning to the physics department at UCSB in summer 2010. Fisher received the Alan T. Waterman Award bestowed by the National Science Foundation in 1995, the National Academy of Sciences Award for Initiatives in Research in 1997, and the Oliver E. Buckley Prize in Condensed Matter Physics in 2015. He was elected as a Member of the American Academy of Arts and Sciences in 2003 and to the National Academy of Sciences in 2012. 1080 Physics Research Building OSU ASC Drupal 8 ascwebservices@osu.edu America/New_York public

Add to Calendar 2023-09-05 15:45:00 2023-09-05 16:45:00 Colloquium- Matthew Fisher (UC Santa Barbara)- Quantum Many-body theory in the Quantum Information era Professor Matthew P.A. Fisher UC Santa Barbara   Quantum Many-body theory in the Quantum Information era Location: 1080 Physics Research Building, Smith Seminar Room Faculty Host: Brian Skinner   Abstract: Traditionally, quantum many-body theory has focused on ground states and equilibrium properties of spatially extended systems, such as electrons and spins in crystalline solids. In recent years \noisy intermediate scale quantum computers" (NISQ) have emerged, providing new opportunities for controllable non-equilibrium many-body systems. In such dynamical quantum systems the inexorable growth of non-local quantum entanglement is expected, but monitoring (by making projective measurements) can compete against entanglement growth. In this talk I will overview theoretical work exploring the behavior of \monitored" quantum circuits, which can exhibit a novel quantum dynamical phase transition between a weak measurement phase and a quantum Zeno phase, the former which we characterize in detail. Accessing such physics in the lab is challenged by the need for post-selection, which might be circumnavigated by decoding using active error correction.   Bio: Matthew Fisher received his Ph.D. in theoretical physics from the University of Illinois at Urbana-Champaign in 1986, and went on to become first a Visiting Scientist and then a Research Staff Member at IBM T. J. Watson Research Center (1986-1993). Matthew joined the Kavli Institute for Theoretical Physics and the Physics Department of the University of California in 1993.  In 2007 he joined Microsoft's Station Q as a research physicist. During the academic year 2009-2010 Matthew was on the faculty at Caltech, returning to the physics department at UCSB in summer 2010. Fisher received the Alan T. Waterman Award bestowed by the National Science Foundation in 1995, the National Academy of Sciences Award for Initiatives in Research in 1997, and the Oliver E. Buckley Prize in Condensed Matter Physics in 2015. He was elected as a Member of the American Academy of Arts and Sciences in 2003 and to the National Academy of Sciences in 2012.         1080 Physics Research Building Department of Physics physics@osu.edu America/New_York public

Professor Matthew P.A. Fisher

UC Santa Barbara

Quantum Many-body theory in the Quantum Information era

Location: 1080 Physics Research Building, Smith Seminar Room

Faculty Host: Brian Skinner

Abstract: Traditionally, quantum many-body theory has focused on ground states and equilibrium properties of spatially extended systems, such as electrons and spins in crystalline solids. In recent
years \noisy intermediate scale quantum computers" (NISQ) have emerged, providing new opportunities for controllable non-equilibrium many-body systems. In such dynamical quantum systems the inexorable growth of non-local quantum entanglement is expected, but monitoring (by making projective measurements) can compete against entanglement growth. In this talk I will overview theoretical work exploring the behavior of \monitored" quantum circuits, which can exhibit a novel quantum dynamical phase transition between a weak measurement phase and a quantum Zeno phase, the former which we characterize in detail. Accessing such physics in the lab is challenged by the need for post-selection, which might be circumnavigated by decoding using active error correction.

Bio: Matthew Fisher received his Ph.D. in theoretical physics from the University of Illinois at Urbana-Champaign in 1986, and went on to become first a Visiting Scientist and then a Research Staff Member at IBM T. J. Watson Research Center (1986-1993). Matthew joined the Kavli Institute for Theoretical Physics and the Physics Department of the University of California in 1993. In 2007 he joined Microsoft's Station Q as a research physicist. During the academic year 2009-2010 Matthew was on the faculty at Caltech, returning to the physics department at UCSB in summer 2010. Fisher received the Alan T. Waterman Award bestowed by the National Science Foundation in 1995, the National Academy of Sciences Award for Initiatives in Research in 1997, and the Oliver E. Buckley Prize in Condensed Matter Physics in 2015. He was elected as a Member of the American Academy of Arts and Sciences in 2003 and to the National Academy of Sciences in 2012.

Photos from Colloquium:

Photo of outside of Smith Seminar room, people lining up for donuts before colloquium

Fruit trays and donuts on table just outside Smith Seminar Room

Inside of Smith Seminar Room, taken from front of room and facing out into atrium