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Quantum Many-Body Scars and Weak Breaking of Ergodicity
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Recent discovery of persistent revivals in quantum simulators based on Rydberg atoms have pointed to the existence of a new type of dynamical behavior that challenged the conventional paradigms of integrability and thermalization. This novel collective effect has been named quantum many-body scars by analogy with weak ergodicity breaking of a single particle inside a stadium billiard. In this overview, we provide a pedagogical introduction to quantum many-body scars and highlight the newly emerged connections with the semiclassical quantization of many-body systems. We discuss the relation between scars and more general routes towards weak violations of ergodicity due to "embedded" algebras and non-thermal eigenstates, and highlight possible applications of scars in quantum technology.
Forward citations
Cited by 6 Pith papers
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Exact Quantum Many-Body Scars in 2D Quantum Gauge Models
Exact many-body scar eigenstates of a 2D XY model are mapped via Kramers-Wannier duality to exact scars of a Z2 lattice gauge theory.
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Single-eigenstate test of eigenstate thermalization hypothesis via perturbed eigenstate quench
A single-eigenstate ETH diagnostic based on the time-averaged evolution speed after a perturbed eigenstate quench is proposed, with an S-curve versus J-curve shape distinction benchmarked on small spin chains.
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Size Operator and Spectral Clustering in the Two Coupled SYK Model
The finite-N spectrum of the two coupled SYK model organizes into operator-size clusters that underlie the conformal towers, revival dynamics, and wormhole-black hole transition.
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Many-Body Physics from Spin-Phonon Coupling in Rydberg Atom Arrays
Spin-phonon coupling from atomic vibrations in Rydberg arrays induces three-spin interactions that stabilize a new Z3 phase and suppress quantum scar thermalization.
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Complexity of PXP scars revisited
In the PXP model, the arch in the Lanczos coefficients is traced to a linear sl(3) part of the Hamiltonian, and the arch width is proposed as a signal distinguishing scarred from thermalizing states.
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Few is different: deciphering many-body dynamics in mesoscopic quantum gases
A workshop report mapping the size, equilibrium, and interaction frontiers of hydrodynamic behavior in mesoscopic quantum systems, connecting few-atom Fermi gases and high-energy small collision systems.
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