Cited by 863Quantum many-body systemsCold Atom Physics and Bose-Einstein CondensatesQuantum Information and Cryptography

Quasiparticle engineering and entanglement propagation in a quantum many-body system

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Jurcevic, P., Lanyon, B. P., Hauke, P., Hempel, C., Zoller, P., Blatt, R., Roos, C. F.·2014·Nature

Abstract

The key to explaining and controlling a range of quantum phenomena is to study how information propagates around many-body systems. Quantum dynamics can be described by particle-like carriers of information that emerge in the collective behaviour of the underlying system, the so-called quasiparticles. These elementary excitations are predicted to distribute quantum information in a fashion determined by the system's interactions. Here we report quasiparticle dynamics observed in a quantum many-body system of trapped atomic ions. First, we observe the entanglement distributed by quasiparticles as they trace out light-cone-like wavefronts. Second, using the ability to tune the interaction range in our system, we observe information propagation in an experimental regime where the effective-light-cone picture does not apply. Our results will enable experimental studies of a range of quantum phenomena, including transport, thermalization, localization and entanglement growth, and represent a first step towards a new quantum-optic regime of engineered quasiparticles with tunable nonlinear interactions.

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  • The approach is not restricted to optical lattices and can be applied to ultracold atoms and polar molecules, including scenarios governed by three-body interactions.

    “Clearly, our approach is not restricted to optical lattices and can be applied to ultracold atoms and polar molecules, including scenarios governed by three-body interactions [43].”
  • The maximal speed of quantum evolution is given by the time-averaged norm of the generator of the dynamics; for unitary dynamics and orthogonal states it reduces to the average energy E.

    “It has been shown that the maximal speed of quantum evolution is given by the time averaged norm of the generator of the dynamics [51], which in the case of unitary dynamics and for orthogonal states reduces to the average energy E [48].”
  • The minimal time for a quantum system to evolve from its initial to its final state, the QSL time, is approximately ħ/(2E).

    “Thus, the minimal time during which a quantum system can evolve from the initial to the final state, i.e., the QSL time τ QSL , is determined by τ QSL ≃ ℏ=2E [48,51].”

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Research works printed but not linked: 1

  1. [14]Yao, N. Y. et al. Many-body localization with dipoles. arXiv:1311.7151 (2014). · arXiv

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Authors
Jurcevic, P., Lanyon, B. P., Hauke, P., Hempel, C., Zoller, P., Blatt, R., & Roos, C. F.
Affiliations
Austrian Academy of Sciences (AT)
Corresponding author
Roos, C. F.
Venue
Nature
Published
2014-07-09
Volume
511
Issue
7508
Pages
202-205
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1692771265
Cited by
863
References
47
Citations by year
2026: 29 · 2025: 55 · 2024: 57 · 2023: 69 · 2022: 79 · 2021: 67 · 2020: 88 · 2019: 88 · 2018: 82 · 2017: 77 · 2016: 93 · 2015: 62 · 2014: 17
FWCI
41.27
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Iris (University of Trento) (submittedVersion, other-oa)
  • arXiv (Cornell University)
  • Bulletin of the American Physical Society
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum many-body systems
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Cold Atom Physics and Bose-Einstein Condensates
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
Keywords
quasiparticle dynamics, entanglement propagation, trapped atomic ions, long-range interactions, quantum many-body systems, quantum transport, thermalization, localization, entanglement growth

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