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Decoherence, Entanglement Negativity and Circuit Complexity for Open Quantum System

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arxiv 2210.09268 v1 pith:LARBC6IN submitted 2022-10-17 hep-th cond-mat.stat-mechcond-mat.str-elquant-ph

Decoherence, Entanglement Negativity and Circuit Complexity for Open Quantum System

classification hep-th cond-mat.stat-mechcond-mat.str-elquant-ph
keywords complexitysaturationtimeentanglemententropylinearmodelnegativity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this paper, we compare the saturation time scales for complexity, linear entropy and entanglement negativity for two open quantum systems. Our first model is a coupled harmonic oscillator, where we treat one of the oscillators as the bath. The second one is a type of Caldeira Leggett model, where we consider a one-dimensional free scalar field as the bath. Using these open quantum systems, we discovered that both the complexity of purification and the complexity from operator state mapping is always saturated for a completely mixed state. More explicitly, the saturation time scale for both types of complexity is smaller than the saturation time scale for linear entropy. On top of this, we found that the saturation time scale for linear entropy and entanglement negativity is of the same order for the Caldeira Leggett model.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. The Geometry of Quantum Complexity in Open Systems

    quant-ph 2026-07 accept novelty 7.0

    Nielsen complexity for Lindbladian open systems induces a sub-Finslerian geometry on mixed states whose flag curvature depends on control penalty factors.

  2. A Landscape of Cosmological Decoherence

    gr-qc 2026-06 unverdicted novelty 6.0

    A geometric landscape of mixed states for cosmological perturbations unifies decoherence models and derives non-linearity bounds that rule out decohered thermal states and limit amplitude-diagonal models to under 70 e...