Scrambling via braiding of nonabelions
Scrambling via braiding of nonabelions
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通过编织非阿贝尔离子进行加扰
DOI:
10.1103/physrevb.99.045132
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发表时间:
2018
影响因子:
3.7
通讯作者:
C. Chamon
中科院分区:
文献类型:
--
作者:
Zhi;K. Meichanetzidis;S. Kourtis;C. Chamon
We study how quantum states are scrambled via braiding in systems of non-Abelian anyons through the lens of entanglement spectrum statistics. We define a distance between the entanglement level spacing distribution of a state evolved under random braids and that of a Haar-random state, using the Kullback-Leibler divergence $D_{\mathrm{KL}}$. We study $D_{\mathrm{KL}}$ numerically for random braids of Majorana fermions (supplemented with random local four-body interactions) and Fibonacci anyons. For comparison, we also obtain $D_{\mathrm{KL}}$ for the Sachdev-Ye-Kitaev model of Majorana fermions with all-to-all interactions, random unitary circuits built out of (a) Hadamard (H), $\pi/8$ (T), and CNOT gates, and (b) random unitary circuits built out of two-qubit Haar-random unitaries. We define as a universal clock the Page limit-normalized entanglement entropy $S/S_{\mathrm{max}}$, which allows us to compare all different models on equal footing. 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 scrambles faster than the universal H+T+CNOT set. Our results promote $D_{\mathrm{KL}}$ as a quantifiable metric for scrambling and quantum chaos, which applies to generic quantum systems away from large-$N$ or semiclassical limits.
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影响因子:
3.7
作者:
Khemani V
通讯作者:
Khemani V
影响因子:
12.5
作者:
Nahum, Adam;Vijay, Sagar;Haah, Jeongwan
通讯作者:
Haah, Jeongwan
DOI:
10.48550/arxiv.1803.00089
发表时间:
2018
期刊:
arXiv e-prints
影响因子:
--
作者:
Jonay Cheryne
通讯作者:
Jonay Cheryne
影响因子:
3.7
作者:
Eberlein, Andreas;Kasper, Valentin;Steinberg, Julia
通讯作者:
Steinberg, Julia