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Tunable phononic coupling in excitonic quantum emitters.

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Researchers created quantum emitters in WSe2 with tunable coupling between excitons and phonons. This breakthrough enables strong phonon-photon interactions for quantum information transduction.

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Area of Science:

  • Quantum Science and Technologies
  • Solid-State Physics
  • Optomechanics

Background:

  • Controlling quantum excitations is crucial for quantum technologies.
  • Quantum light sources require tunable coupling between single photons and phonons for information transduction.

Purpose of the Study:

  • To deterministically create quantum emitters with tunable exciton-phonon coupling.
  • To explore the potential for strong coupling in a solid-state quantum optomechanical system.

Main Methods:

  • Fabrication of strain-induced quantum dots in homobilayer WSe2.
  • Investigating the colocalization of quantum-confined interlayer excitons and terahertz interlayer breathing-mode phonons.
  • Analyzing single-photon emission spectra, purity, and phonon replicas.

Main Results:

  • Achieved deterministic creation of quantum emitters with tunable exciton-phonon coupling.
  • Observed strong phonon coupling (Huang-Rhys factor up to 6.3) to single-photon emission.
  • Demonstrated single-photon purity >83% and multiple phonon replicas indicating phonon Fock states.
  • Showcased electrically tunable phonon-photon interaction exceeding decoherence rates.

Conclusions:

  • A solid-state quantum excitonic-optomechanical system was demonstrated at the WSe2 bilayer interface.
  • The system emits photonic qubits coupled with stationary phonons, promising for quantum transduction and interconnection.