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Efficient Multiphoton Generation in Waveguide Quantum Electrodynamics.

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This study introduces novel protocols for generating complex multiphoton quantum states using waveguide quantum electrodynamics (QED). These methods enhance efficiency and fidelity for quantum technologies by leveraging atomic interactions and a polynomial scaling excitation merging protocol.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Quantum information science

Background:

  • Generating single-mode multiphoton quantum states is crucial for quantum technologies like quantum cryptography and metrology.
  • Current methods for creating these states often face limitations in fidelity and probability of success.

Purpose of the Study:

  • To develop efficient and reliable protocols for generating complex single-mode multiphoton states.
  • To overcome the limitations of existing methods in terms of fidelity and probability.

Main Methods:

  • Utilizing strong and long-range atomic interactions induced by waveguide quantum electrodynamics (QED).
  • Employing atoms for both generating and heralding excitations.
  • Designing a protocol to merge excitations in different internal atomic levels, achieving polynomial scaling.

Main Results:

  • Demonstrated protocols for efficient loading of excitations in atomic collections.
  • Achieved boosted success probability and fidelity in multiphoton state generation.
  • Developed a method to overcome exponential scaling issues with a polynomial scaling approach.

Conclusions:

  • The proposed waveguide QED protocols offer a promising route to efficiently generate complex multiphoton states.
  • These advancements are vital for the practical implementation of various quantum technologies.
  • The polynomial scaling excitation merging protocol addresses a key challenge in generating multi-excitation states.