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Unitary Designs of Symmetric Local Random Circuits

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arxiv 2408.13472 v3 pith:LE3HCPD6 submitted 2024-08-24 quant-ph cond-mat.stat-mech

Unitary Designs of Symmetric Local Random Circuits

classification quant-ph cond-mat.stat-mech
keywords localityunitarycircuitdesigngenerallocalrandomsymmetric
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have established the method of characterizing the unitary design generated by a symmetric local random circuit. Concretely, we have shown that the necessary and sufficient condition for the circuit asymptotically forming a t-design is given by simple integer optimization for general symmetry and locality. By using the result, we explicitly give the maximal order of unitary design under the $\mathbb{Z}_2$, U(1), and SU(2) symmetries for general locality. This work reveals the relation between the fundamental notions of symmetry and locality in terms of randomness.

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Cited by 1 Pith paper

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  1. Apparent Universal Behavior in Second Moments of Random Quantum Circuits

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    Most random circuit geometries form approximate 2-designs in O(log n) depth with explicit constants; bridge/lollipop graphs need Ω(n²) gates, and 10-20 layers suffice for 50-qubit near-random circuits.