Scrambling via braiding of nonabelions

Yang, Zhi-Cheng; Meichanetzidis, Konstantinos; Kourtis, Stefanos; Chamon, Claudio

doi:10.1103/physrevb.99.045132

Title: Scrambling via braiding of nonabelions

Journal Article · Fri Jan 18 00:00:00 EST 2019 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.99.045132· OSTI ID:1609748

Yang, Zhi-Cheng ^[1]; Meichanetzidis, Konstantinos ^[2]; Kourtis, Stefanos ^[1]; Chamon, Claudio ^[1]

Boston Univ., MA (United States)
Univ. of Leeds (United Kingdom)

We study how quantum states are scrambled via braiding in systems of non-Abelian anyons through the lens of entanglement spectrum statistics. In particular, we focus on the degree of scrambling, defined as the randomness produced by braiding, at the same amount of entanglement entropy. To quantify the degree of randomness, we define a distance between the entanglement spectrum level spacing distribution of a state evolved under random braids and that of a Haar-random state, using the Kullback-Leibler divergence D_KL. We study D_KL numerically for random braids of Majorana fermions (supplemented with random local four-body interactions) and Fibonacci anyons. For comparison, we also obtain D_KL for the Sachdev-Ye-Kitaev model of Majorana fermions with all-to-all interactions, random unitary circuits built out of (a) Hadamard (H), π/8 (T), and CNOT gates, and (b) random unitary circuits built out of two-qubit Haar random unitaries. To compare the degree of randomness that different systems produce beyond entanglement entropy, we look at D_KL as a function of the Page limit-normalized entanglement entropy S/S_max. Furthermore, our results reveal a hierarchy of scrambling among various models—even for the same amount of entanglement entropy—at intermediate times, whereas all models exhibit the same late-time behavior. In particular, we find that braiding of Fibonacci anyons randomizes initial product states more efficiently than the universal H+T+CNOT set.

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Research Organization:: Boston Univ., MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-06ER46316

OSTI ID:: 1609748

Alternate ID(s):: OSTI ID: 1491287

Journal Information:: Physical Review. B, Vol. 99, Issue 4; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Title: Scrambling via braiding of nonabelions

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