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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum information science

Background:

  • Linear quantum operations are crucial for quantum information processing.
  • Photonic systems are commonly used for quantum operations.
  • Spin waves are collective excitations in magnetic materials.

Purpose of the Study:

  • To extend linear quantum operations to the spin wave domain.
  • To demonstrate quantum control over single spin wave excitations.
  • To realize a spin-wave analog of the Hong-Ou-Mandel effect.

Main Methods:

  • Utilizing the ac Stark effect for quantum operations.
  • Implementing a beam splitter in the spin wave domain.
  • Working with collective excitations in materials.

Main Results:

  • Successfully performed quantum operations on single spin wave excitations.
  • Demonstrated a spin-wave analog of the Hong-Ou-Mandel effect.
  • Established a method for quantum information processing in spin waves.

Conclusions:

  • The developed scheme enables quantum information processing in spin waves.
  • This work can enhance atomic-ensemble-based quantum repeaters.
  • The methodology is adaptable to other physical systems like doped crystals and atomic ensembles.