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Quantum CZ gates on a single gradient metasurface.

Qi Liu1,2, Yu Tian1,2, Zhaohua Tian1

  • 1State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing, 100871, China.

Light, Science & Applications
|May 13, 2025
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Summary
This summary is machine-generated.

We demonstrate a single gradient metasurface for on-chip quantum information processing, enabling multiple quantum controlled-Z (CZ) gates. This approach enhances quantum photonic integration and error detection capabilities.

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Area of Science:

  • Quantum optics
  • Nanophotonics
  • Quantum information science

Background:

  • On-chip quantum information processing requires efficient integration of quantum gates.
  • Metasurfaces offer novel functionalities for manipulating light at the nanoscale.

Purpose of the Study:

  • To propose a scheme for realizing quantum controlled-Z (CZ) gates using a single gradient metasurface.
  • To explore the potential for high-density and multifunctional integration of quantum devices.

Main Methods:

  • Utilizing the parallel beam-splitting feature of a gradient metasurface.
  • Implementing polarization encoding and path encoding for CZ gates.
  • Leveraging the locking of output path by input polarization to filter errors.

Main Results:

  • A single metasurface can support polarization-encoded CZ gates, path-encoded CZ gates, multiple independent CZ gates, and cascaded CZ gates.
  • Path-encoded CZ gates effectively filter bit-flip errors from beam-splitting.
  • The proposed CZ gates can detect quantum errors and generate high-dimensional entanglement.

Conclusions:

  • Integrating quantum CZ gates onto a single metasurface facilitates high-density and multifunctional quantum photonic integration.
  • This work opens new avenues for advanced on-chip quantum information processing.
  • Metasurface-based quantum gates offer enhanced error resilience and entanglement generation capabilities.