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Updated: May 22, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Published on: September 5, 2019

Entangled and sequential quantum protocols with dephasing.

Sergio Boixo1, Chris Heunen

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|May 1, 2012
PubMed
Summary
This summary is machine-generated.

Entanglement can parallelize quantum operations, even with dephasing noise. This finding suggests entangled quantum protocols are as robust and effective as sequential ones, impacting quantum metrology and circuit complexity.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Metrology

Background:

  • Commuting quantum operators can be parallelized using entanglement.
  • This parallelization is key to optimal quantum metrology and circuit complexity.
  • Dephasing noise typically limits quantum protocol performance.

Purpose of the Study:

  • To investigate if dephasing quantum maps can be parallelized.
  • To determine the impact of parallelization on the robustness and effectiveness of quantum protocols under dephasing noise.
  • To generalize findings across different quantum theories.

Main Methods:

  • Utilized tensor networks for derivation.
  • Employed transformations within string diagrams in dagger compact closed categories.
  • Applied methods to general dephasing noise in arbitrary dimensions.

Main Results:

  • Demonstrated that dephasing quantum maps can be parallelized.
  • Showed entangled protocols are not more fragile than sequential ones under dephasing noise.
  • Confirmed sequential protocols are not less effective than entangled ones.

Conclusions:

  • Entanglement offers a robust parallelization strategy for quantum operations, even in the presence of dephasing noise.
  • The findings generalize to other quantum theories like geometric quantization and topological quantum field theory.
  • Clarified the role of entanglement in general quantum theories, impacting quantum metrology and circuit complexity.