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A deterministic detector for vector vortex states.

Bienvenu Ndagano1, Isaac Nape1, Benjamin Perez-Garcia1,2

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Researchers developed a deterministic detection system for high-dimensional quantum information encoding using vector vortex modes. This breakthrough enables enhanced quantum communication and information processing by maintaining detection fidelity.

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Area of Science:

  • Quantum optics
  • Quantum information science

Background:

  • High-dimensional encoding in photons offers advanced quantum protocols.
  • Deterministic detection is crucial for realizing the full potential of increased dimensions, especially in quantum key distribution.
  • Vector vortex modes, with entangled polarization and orbital angular momentum, are promising for information encoding but lack deterministic detection methods.

Purpose of the Study:

  • To present a novel method for the deterministic detection of single photon states in a four-dimensional space.
  • To enable the use of vector vortex modes for robust quantum information encoding.
  • To overcome limitations in detecting non-separable quantum states.

Main Methods:

  • Development of a deterministic detection system for single photon states.
  • Utilizing vector vortex modes spanning four dimensions, including entangled polarization and orbital angular momentum.
  • Demonstration with vector vortex modes from |l|=1 and |l|=10 subspaces using classical and weak coherent states.

Main Results:

  • Achieved deterministic detection of single photon states in a four-dimensional space.
  • Demonstrated excellent detection fidelities for both pure and superposition vector states.
  • Validated the system with vector vortex modes at different orbital angular momentum values.

Conclusions:

  • The presented method allows for deterministic detection of high-dimensional quantum states encoded in vector vortex modes.
  • This opens possibilities for increasing the dimensionality of quantum information encoding while ensuring reliable detection.
  • The work is valuable for advancing long-distance classical and quantum communication.