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Entanglement spectrum of mixed states

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2018

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van Nieuwenburg, Evert

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https://doi.org/10.1103/PhysRevA.98.012327
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http://arxiv.org/abs/1803.09842

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Physical Review A. American Physical Society (APS). 2018, 98(1), 012327. ISSN 2469-9926. eISSN 2469-9934. Available under: doi: 10.1103/PhysRevA.98.012327

Zusammenfassung

Entanglement plays an important role in our ability to understand, simulate, and harness quantum many-body phenomena. In this work, we investigate the entanglement spectrum for open one-dimensional (1D) systems and propose a natural quantifier for how much a 1D quantum state is entangled while being subject to decoherence. We demonstrate our method using a simple case of single-particle evolution and find that the open system entanglement spectrum is composed of generalized concurrence values, as well as quantifiers of the state's purity. Our proposed entanglement spectrum can be directly obtained using a correct scaling of a matrix product state decomposition of the system's density matrix. Our method thus offers observables that are easily acquired in the study of interacting 1D systems and sheds light on the approximations employed in matrix product state simulations of open system dynamics.

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ISO 690VAN NIEUWENBURG, Evert, Oded ZILBERBERG, 2018. Entanglement spectrum of mixed states. In: Physical Review A. American Physical Society (APS). 2018, 98(1), 012327. ISSN 2469-9926. eISSN 2469-9934. Available under: doi: 10.1103/PhysRevA.98.012327
BibTex
@article{vanNieuwenburg2018Entan-54986,
  year={2018},
  doi={10.1103/PhysRevA.98.012327},
  title={Entanglement spectrum of mixed states},
  number={1},
  volume={98},
  issn={2469-9926},
  journal={Physical Review A},
  author={van Nieuwenburg, Evert and Zilberberg, Oded},
  note={Article Number: 012327}
}
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