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DTSTART:20231105T010000
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SUMMARY:IQC Student Seminar Featuring Shayan Majidy
DESCRIPTION:Critical phase and spin sharpening in SU(2)-symmetric monitored quantum circuits \n\nMonitored quantum circuits exhibit entanglement transitions at certain measurement rates. Such a transition separates phases characterized by how much information an observer can learn from the measurement outcomes. We study SU(2)-symmetric monitored quantum circuits\, using exact numerics and a mapping onto an effective statistical-mechanics model. Due to the symmetry's non-Abelian nature\, measuring qubit pairs allows for nontrivial entanglement scaling even in the measurement-only limit. We find a transition between a volume-law entangled phase and a critical phase whose diffusive purification dynamics emerge from the non-Abelian symmetry. Additionally\, we identify a “spin-sharpening transition.” Across the transition\, the rate at which measurements reveal information about the total spin quantum number changes parametrically with system size.
X-ALT-DESC;FMTTYPE=text/html:**Critical phase and spin sharpening in SU(2)-symmetric monitored quantum circuits **

Monitored quantum circuits exhibit entanglement transitions at certain measurement rates. Such a transition separates phases characterized by how much information an observer can learn from the measurement outcomes. We study SU(2)-symmetric monitored quantum circuits, using exact numerics and a mapping onto an effective statistical-mechanics model. Due to the symmetry's non-Abelian nature, measuring qubit pairs allows for nontrivial entanglement scaling even in the measurement-only limit. We find a transition between a volume-law entangled phase and a critical phase whose diffusive purification dynamics emerge from the non-Abelian symmetry. Additionally, we identify a “spin-sharpening transition.” Across the transition, the rate at which measurements reveal information about the total spin quantum number changes parametrically with system size.
LOCATION:QNC 1201
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