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Physics Seminar: Matthew P.A. Fisher - Decoding and Steering Monitored Quantum Dynamics

Piers Coleman <>

Location:  Physics 330 W & Zoom
Date & time: Tuesday, 09 April 2024 at 1:30PM - 2:30PM


Speaker:  Matthew P.A. Fisher, UC Santa Barbara

TitleDecoding and Steering Monitored Quantum Dynamics

Date and Time: Tuesday, April 9, 2024, 01:30pm

Abstract:  Traditionally, quantum condensed matter 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 dynamics. In such dynamical quantum systems the inexorable growth of quantum entanglement is expected, but monitoring" (by making projective measurements) can compete against entanglement growth. In this talk I will overview work exploring the behavior of such monitored" quantum circuits, which can exhibit measurement-induced phase transitions (MIPT), for example between volume law and area law  entanglement. Experimental verification of these MIPT's can be challenging due to the so-called post-selection problem, but can be circumnavigated employing classical-quantum decoding". Alternatively, by employing active feedback, such quantum dynamical systems can be steered" towards a unique pure state, which does not suffer from post selection, as I will briefly illuminate. 

Location: Room 330W, 126 Frelinghuysen Road & Zoom

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