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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Optics

Background:

  • Semiconductor microcavities host exciton-polariton systems.
  • Strong coupling regime enables unique quantum phenomena.
  • Quantum information processing requires stable qubits.

Purpose of the Study:

  • Propose a novel mechanism for creating long-lived exciton-photon qubits.
  • Investigate enhancement of qubit coherence times.
  • Explore applications in quantum information processing.

Main Methods:

  • Theoretical proposal of a physical mechanism.
  • Analysis of exciton-polariton states in microcavities.
  • Consideration of stimulated pumping from a thermal reservoir.

Main Results:

  • Macroscopic exciton-photon qubits can be created.
  • Polariton qubits are superpositions of specific exciton-polariton branches.
  • Coherence time enhancement via stimulated pumping is predicted.

Conclusions:

  • The proposed mechanism offers a route to robust quantum information processing.
  • Enhanced coherence times are crucial for practical qubit applications.
  • Potential applications include quantum information processing, cloning, and storage.