Tunable many-body burst in isolated quantum systems

• URL: http://arxiv.org/abs/2602.09665v2
• Date: Wed, 18 Feb 2026 08:47:20 GMT
• Title: Tunable many-body burst in isolated quantum systems
• Authors: Shozo Yamada, Akihiro Hokkyo, Masahito Ueda,
• Abstract summary: We show that a burst of magnetization can be realized for a nonintegrable mixed-field Ising chain on a timescale comparable to the onset of quantum scrambling.<n>Our results suggest that a nonequilibrium state is maintained for an appropriately chosen initial state until scrambling becomes dominant.
• Score: 4.396860522241306
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Thermalization in isolated quantum many-body systems can be nonmonotonic, with its process dependent on an initial state. We propose a numerical method to construct a low-entangled initial state that creates a "burst" -- a transient deviation of an observable from its thermal equilibrium value -- at a designated time. We apply this method to demonstrate that a burst of magnetization can be realized for a nonintegrable mixed-field Ising chain on a timescale comparable to the onset of quantum scrambling. Contrary to the typical spreading of information in this regime, the created burst is accompanied by a slow or even negative entanglement growth. Analytically, we show that a burst becomes probabilistically rare after a long time. Our results suggest that a nonequilibrium state is maintained for an appropriately chosen initial state until scrambling becomes dominant. These predictions can be tested with programmable quantum simulators.

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