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Creators/Authors contains: "Halpern, Nicole Yunger"

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  1. ; ; ; ; ; (, Physical Review B)
    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. 
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  2. ; ; (, Journal of Physics A: Mathematical and Theoretical)
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  3. ; ; ; ; ; ; ; ; (, Quantum Science and Technology)