Abstract

Fractional statistics and quantum chaos are both phenomena associated with the non-local storage of quantum information. In this article, we point out a connection between the butterfly effect in (1+1)-dimensional rational conformal field theories and fractional statistics in (2+1)-dimensional topologically ordered states. This connection comes from the characterization of the butterfly effect by the out-of-time-order-correlator proposed recently. We show that the late-time behavior of such correlators is determined by universal properties of the rational conformal field theory such as the modular S-matrix and conformal spins. Using the bulk-boundary correspondence between rational conformal field theories and (2+1)-dimensional topologically ordered states, we show that the late time behavior of out-of-time-order-correlators is intrinsically connected with fractional statistics in the topological order. We also propose a quantitative measure of chaos in a rational conformal field theory, which turns out to be determined by the topological entanglement entropy of the corresponding topological order.

Highlights

  • We are interested in the size of the operator.) Recently, a generalization of such quantities have been studied in many-body systems, where operators x and p are replaced by generic many-body operators. [2,3,4]

  • Our result shows that when time t goes to ∞, of-time-ordered correlators (OTOCs) in (1 + 1)-dimensional rational conformal field theories (RCFTs) are intrinsically related to the fraction statistics [14, 15] in (2 + 1)-dimensional topological order

  • We studied OTOC in the context of RCFTs, and relate its behavior to the universal algebraic data of RCFT, such as the monodromy matrix and the modular S-matrix

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Summary

Definitions and conventions

Before going to the detailed discussions, we first declare some general definitions for OTOC. Previous studies [2, 3, 7, 18] of such correlation function focused on the early time β < t < tscr, i.e., between the dissipation time and the scrambling time, and found interesting “Lyapunov behavior” for those systems that can be holographically described by Einstein gravity. For a generic system that does not have a large separation between dissipation time td ∼ β and scrambling time tscr, the “Lyapunov behavior” is not welldefined. We denote the inner product x|x = V †W †(t)W (t)V β by g(t). In the regime t β, such a four point function generically factorizes to g(t) ∼ V †V β W †W β, which represents a normalization for operators W and V. We will study the late time behavior of f (t) in the context of RCFTs

An overview of existing results
Rational conformal field theories
Examples
The bulk-boundary correspondence
Out-of-time-ordered-correlators of random operators
Conclusion and discussions
A Notations and conventions

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