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- W4321472164 abstract "The non-equilibrium dynamics of quantum spin models is a most challenging topic, due to the exponentiality of Hilbert space; and it is central to the understanding of the many-body entangled states that can be generated by state-of-the-art quantum simulators. A particularly important class of evolutions is the one governed by U(1) symmetric Hamiltonians, initialized in a state which breaks the U(1) symmetry -- the paradigmatic example being the evolution of the so-called one-axis-twisting (OAT) model, featuring infinite-range interactions between spins. In this work we show that the dynamics of the OAT model can be closely reproduced by systems with power-law-decaying interactions, thanks to an effective separation between the zero-momentum degrees of freedom, associated with the so-called Anderson tower of states, and reconstructing a OAT model; and finite-momentum ones, associated with spin-wave excitations. This mechanism explains quantitatively the recent numerical observation of spin squeezing and Schrodinger-cat generation in the dynamics of dipolar Hamiltonians; and it paves the way for the extension of this observation to a much larger class of models of immediate relevance for quantum simulations." @default.
- W4321472164 created "2023-02-22" @default.
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- W4321472164 date "2023-02-18" @default.
- W4321472164 modified "2023-10-01" @default.
- W4321472164 title "Entangling dynamics from effective rotor/spin-wave separation in U(1)-symmetric quantum spin models" @default.
- W4321472164 doi "https://doi.org/10.48550/arxiv.2302.09271" @default.
- W4321472164 hasPublicationYear "2023" @default.
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