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Xiaoqing Zhong1, Feihu Xu2, Hoi-Kwong Lo3,4,5

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This study introduces an advanced quantum fingerprinting protocol using coherent states and channel multiplexing. The new method significantly reduces communication time and data, outperforming classical and existing quantum approaches.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication

Background:

  • Quantum communication complexity investigates efficient information transfer using quantum mechanics.
  • Quantum fingerprinting offers potential exponential communication savings over classical methods.

Purpose of the Study:

  • To propose a novel quantum fingerprinting protocol utilizing coherent states and channel multiplexing.
  • To demonstrate significant reductions in communication time and data volume compared to existing protocols.

Main Methods:

  • Implementation of a quantum fingerprinting protocol with coherent states.
  • Utilizing channel multiplexing for simultaneous signal detection across multiple channels.
  • Experimental validation using a six-wavelength channel setup.

Main Results:

  • The proposed protocol achieves orders-of-magnitude reduction in communication requirements.
  • Demonstrated superiority over classical limits and existing coherent quantum fingerprinting protocols.
  • Experimental results confirm the protocol's efficiency and advantage in communication amount.

Conclusions:

  • The novel protocol offers a highly efficient solution for quantum fingerprinting tasks.
  • Channel multiplexing with coherent states provides a scalable advantage for quantum communication.
  • The protocol advances practical quantum communication by reducing resource demands.