Ternary unitary quantum lattice models and circuits in $2+1$ dimensions

Abstract

We extend the concept of dual unitary quantum gates to quantum lattice models in $2+1$ dimensions, by introducing and studying ternary unitary four-particle gates, which are unitary in time and both spatial dimensions. When used as building blocks of lattice models with periodic boundary conditions in time and space (corresponding to infinite temperature states), dynamical correlation functions exhibit a light-ray structure. We also generalize solvable MPS to two spatial dimensions with cylindrical boundary conditions, by showing that the analogous solvable PEPS can be identified with matrix product unitaries. In the resulting tensor network for evaluating equal-time correlation functions, the bulk ternary unitary gates cancel out. We delineate and implement a numerical algorithm for computing such correlations by contracting the remaining tensors.

arXiv comment16 pages, 6 figures

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Cited by in corpus (13)

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• Hierarchical generalization of dual unitarity
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• Circuits of space and time quantum channels
• Zero-temperature entanglement membranes in quantum circuits
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• Logarithmic growth of operator entanglement in a clean non-integrable circuit