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Updated: Jun 21, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

Supersonic quantum communication.

J Eisert1, D Gross

  • 1Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany.

Physical Review Letters
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

Quantum excitations in bosonic models can accelerate, transmitting information faster than a finite speed of sound. This challenges previous beliefs about propagation limits in quantum systems.

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Area of Science:

  • Quantum physics
  • Condensed matter theory
  • Quantum information science

Background:

  • Excitation propagation in quantum lattices underlies many nonequilibrium phenomena and quantum information transmission.
  • The Lieb-Robinson theorem establishes finite propagation speeds (speed of sound) in spin models.
  • A common belief posits finite propagation speeds for local Hamiltonians in quantum systems.

Purpose of the Study:

  • To investigate excitation propagation dynamics in translationally invariant bosonic models with nearest-neighbor interactions.
  • To challenge the prevailing notion of finite propagation speeds in such quantum systems.
  • To explore implications for quantum information transmission and computational complexity.

Main Methods:

  • Theoretical analysis of quantum lattice models.
  • Proving properties of dynamics under natural Hamiltonians.
  • Focusing on translationally invariant bosonic models with nearest-neighbor interactions.

Main Results:

  • Demonstrated that excitations in these bosonic models can accelerate.
  • Showed that information can be transmitted faster than any finite speed of sound.
  • Identified a departure from the predictions of the Lieb-Robinson bound for bosonic systems.

Conclusions:

  • The belief in finite propagation speeds for all local Hamiltonians is incorrect for certain bosonic models.
  • Accelerating excitations offer a mechanism for faster-than-sound information transmission.
  • Simulating strongly correlated bosonic models may be more computationally demanding than spin chains.