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Quantum phase flip gate based on plasmonic double-bar resonators.

Xing Ri Jin1, Jie Gao

  • 1Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA.

Optics Letters
|August 14, 2013
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Summary

We demonstrated a high-fidelity quantum phase flip gate using coupled quantum dots (QDs) and plasmonic resonators. This breakthrough shows promise for scalable solid-state quantum information processing.

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Area of Science:

  • Quantum physics
  • Nanotechnology
  • Solid-state devices

Background:

  • Quantum information processing relies on high-fidelity quantum gates.
  • Plasmonic nanostructures offer unique optical properties for quantum applications.
  • Coupling quantum dots (QDs) to optical resonators is a key strategy for gate implementation.

Purpose of the Study:

  • To demonstrate a quantum phase flip gate between two QDs.
  • To leverage plasmonic double-bar resonators for strong light-matter coupling.
  • To investigate the role of asymmetric coupling strengths and optimize gate performance.

Main Methods:

  • Utilizing plasmonic double-bar resonators with deep subwavelength mode volumes.
  • Achieving resonant coupling between two QDs and the plasmonic modes.
  • Optimizing the coupling strength ratio (g2/g1) and resonant mode decay rate (κ/g1).

Main Results:

  • Demonstrated a quantum phase flip gate with high fidelity (~98%).
  • Achieved high success probability for the phase gate operation.
  • Showcased large achievable coupling strengths due to plasmonic resonator properties.

Conclusions:

  • Subwavelength-scale plasmonic structures are highly effective for quantum information processing.
  • Optimized asymmetric coupling in plasmonic resonators enables high-performance quantum gates.
  • This work presents a promising platform for scalable solid-state quantum computing.