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Direct observation of quantum percolation dynamics.

Zhen Feng1, Bing-Hong Wu2,3, Hao Tang2,3

  • 1College of Information and Engineering, Wenzhou Medical University, Wenzhou 325000, China.

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Researchers experimentally demonstrated quantum percolation in photonic chips. They observed a quantum percolation threshold of 80%, significantly higher than classical percolation, advancing quantum transport understanding.

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Area of Science:

  • Quantum physics and optics
  • Condensed matter physics
  • Photonic devices

Background:

  • Percolation theory models critical phase transitions in geometrical systems.
  • Quantum mechanics introduces coherence and superposition, creating a quantum regime for percolation with unexplored phenomena.
  • Experimental exploration of quantum percolation has been lacking.

Purpose of the Study:

  • To experimentally demonstrate quantum transport in hexagonal percolation lattices.
  • To investigate quantum percolation phenomena using photonic chips.
  • To explore the relationship between quantum transport, disorder, and localization.

Main Methods:

  • Fabrication of large-scale hexagonal percolation lattices on a photonic chip using femtosecond laser direct writing.
  • Experimental probing of quantum transport in these lattices using coherent light.
  • Analysis of spatial confinement and propagation dynamics using localization parameters.

Main Results:

  • Observed a quantum percolation threshold of 80% in laser-written lattices, exceeding the classical threshold of 63%.
  • Demonstrated a transition from ballistic to diffusive propagation based on occupation probability.
  • Successfully mapped large-scale porous structures into a functional photonic system.

Conclusions:

  • Provides the first experimental observation of quantum percolation.
  • Deepens the understanding of quantum transport, localization, and geometric effects.
  • Inspires potential applications in quantum technologies and materials science.