Scrambling of Quantum Information in Quantum Many-Body Systems - INSPIRE

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Scrambling of Quantum Information in Quantum Many-Body Systems

Eiki Iyoda
(
- Tokyo U., Appl. Phys. Dept.
)
,
Takahiro Sagawa
(
- Tohoku U.
)

Apr 16, 2017

9 pages

Published in:

Phys.Rev.A 97 (2018) 4, 042330

Published: Apr 19, 2018

e-Print:

1704.04850 [cond-mat.stat-mech]

DOI:

10.1103/PhysRevA.97.042330

View in:

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Abstract: (APS)

We systematically investigate scrambling (or delocalizing) processes of quantum information encoded in quantum many-body systems by using numerical exact diagonalization. As a measure of scrambling, we adopt the tripartite mutual information (TMI) that becomes negative when quantum information is delocalized. We clarify that scrambling is an independent property of the integrability of Hamiltonians; TMI can be negative or positive for both integrable and nonintegrable systems. This implies that scrambling is a separate concept from conventional quantum chaos characterized by nonintegrability. Specifically, we argue that there are a few exceptional initial states that do not exhibit scrambling, and show that such exceptional initial states have small effective dimensions. Furthermore, we calculate TMI in the Sachdev-Ye-Kitaev (SYK) model, a fermionic toy model of quantum gravity. We find that disorder does not make scrambling slower but makes it smoother in the SYK model, in contrast to many-body localization in spin chains.

Note:

16 pages, 15 figures

many-body problem
integrability
Hamiltonian
chaos

References(60)

Figures(15)

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