Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Measurement and entanglement phase transitions in all-to-all quantum circuits

Adam Nahum, Sthitadhi Roy, Brian J. Skinner, Jonathan Ruhman

Published Mar 17, 2021• 13 citations
OpenAlex

Related papers

Measurement-induced entanglement transitions in quantum systems

Felix Roser, Verlag Dr. Hut (München)

•Jan 1, 2026•0 citations

Lindblad non-universality of measurement phases and phase transitions

Michael Kolodrubetz

Entanglement phase transitions in hybrid quantum circuits are generally argued to be properties of the individual trajectories rather than measurement-averaged dynamics, despite the fact that results of measurements are not used for feedback in the steady state. Here, we explicitly demonstrate this difference by constructing a family of hybrid quantum circuits with identical measurement-averaged dynamics that give different phases and phase transitions. We propose measurement-averaged destruction of Bell state entanglement as a proxy for determining which hybrid circuit yields the lowest-entanglement dynamics and show that it holds numerically for the measurements we consider. We comment on implications for quantum computing and noisy quantum circuits.

•Nov 22, 2021•0 citations

Optimality of Lindblad unfolding in measurement phase transitions

Michael Kolodrubetz

Entanglement phase transitions in hybrid quantum circuits describe individual quantum trajectories rather than the measurement-averaged ensemble, despite the fact that results of measurements are not conventionally used for feedback. Here, we numerically demonstrate that a class of generalized measurements with identical measurement-averaged dynamics give different phases and phase transitions. We show that measurement-averaged destruction of Bell state entanglement is a useful proxy for determining which hybrid circuit yields the lowest-entanglement dynamics. We use this to argue that no unfolding of our model can avoid a volume law phase, which has implications for simulation of open quantum systems.

arXiv:2111.11391•Physical review. B./Physical review. B•Apr 13, 2023•9 citations

Entanglement and quantum phase transitions

Hai‐Qing Lin, Shi-Jian Gu, Guang-Shan Tian

Bulletin of the American Physical Society•Mar 21, 2005•0 citations

Measurement-Induced Phase Transitions in Long-range Quantum Circuits

Maxwell Block, Yimu Bao, Soonwon Choi +2 more

Bulletin of the American Physical Society•Mar 4, 2020•0 citations

Entanglement Phase Transitions in Measurement-Only Dynamics

Matteo Ippoliti, Michael J. Gullans, Sarang Gopalakrishnan +2 more

Unitary circuits subject to repeated projective measurements can undergo an entanglement phase transition (EPT) as a function of the measurement rate.This transition is generally understood in terms of a competition between the scrambling effects of unitary dynamics and the disentangling effects of measurements.We find that, surprisingly, EPTs are possible even in the absence of scrambling unitary dynamics, where they are best understood as arising from measurements alone.This finding motivates us to introduce measurement-only models, in which the "scrambling" and "unscrambling" effects driving the EPT are fundamentally intertwined and cannot be attributed to physically distinct processes.These models represent a novel form of an EPT, conceptually distinct from that in hybrid unitary-projective circuits.We explore the entanglement phase diagrams, critical points, and quantum code properties of some of these measurement-only models.We find that the principle driving the EPTs in these models is frustration, or mutual incompatibility, of the measurements.Surprisingly, an entangling (volume-law) phase is the generic outcome when measuring sufficiently long but still local (≳3-body) operators.We identify a class of exceptions to this behavior ("bipartite ensembles") which cannot sustain an entangling phase but display dual area-law phases, possibly with different kinds of quantum order, separated by self-dual critical points.Finally, we introduce a measure of information spreading in dynamics with measurements and use it to demonstrate the emergence of a statistical light cone, despite the nonlocality inherent to quantum measurements.

arXiv:2004.09560•Physical Review X•Feb 15, 2021•277 citations
Entanglement phase transitions in hybrid quantum circuits are generally argued to be properties of the individual trajectories rather than measurement-averaged dynamics, despite the fact that results of measurements are not used for feedback in the steady state. Here, we explicitly demonstrate this difference by constructing a family of hybrid quantum circuits with identical measurement-averaged dynamics that give different phases and phase transitions. We propose measurement-averaged destruction of Bell state entanglement as a proxy for determining which hybrid circuit yields the lowest-entanglement dynamics and show that it holds numerically for the measurements we consider. We comment on implications for quantum computing and noisy quantum circuits.
Entanglement phase transitions in hybrid quantum circuits describe individual quantum trajectories rather than the measurement-averaged ensemble, despite the fact that results of measurements are not conventionally used for feedback. Here, we numerically demonstrate that a class of generalized measurements with identical measurement-averaged dynamics give different phases and phase transitions. We show that measurement-averaged destruction of Bell state entanglement is a useful proxy for determining which hybrid circuit yields the lowest-entanglement dynamics. We use this to argue that no unfolding of our model can avoid a volume law phase, which has implications for simulation of open quantum systems.
Unitary circuits subject to repeated projective measurements can undergo an entanglement phase transition (EPT) as a function of the measurement rate.This transition is generally understood in terms of a competition between the scrambling effects of unitary dynamics and the disentangling effects of measurements.We find that, surprisingly, EPTs are possible even in the absence of scrambling unitary dynamics, where they are best understood as arising from measurements alone.This finding motivates us to introduce measurement-only models, in which the "scrambling" and "unscrambling" effects driving the EPT are fundamentally intertwined and cannot be attributed to physically distinct processes.These models represent a novel form of an EPT, conceptually distinct from that in hybrid unitary-projective circuits.We explore the entanglement phase diagrams, critical points, and quantum code properties of some of these measurement-only models.We find that the principle driving the EPTs in these models is frustration, or mutual incompatibility, of the measurements.Surprisingly, an entangling (volume-law) phase is the generic outcome when measuring sufficiently long but still local (≳3-body) operators.We identify a class of exceptions to this behavior ("bipartite ensembles") which cannot sustain an entangling phase but display dual area-law phases, possibly with different kinds of quantum order, separated by self-dual critical points.Finally, we introduce a measure of information spreading in dynamics with measurements and use it to demonstrate the emergence of a statistical light cone, despite the nonlocality inherent to quantum measurements.