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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Researchers engineered quantum vacuum using chiral exceptional points (EPs) to control single quantum emitter

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Area of Science:

  • Quantum photonics
  • Non-Hermitian physics
  • Cavity quantum electrodynamics

Background:

  • Exceptional points (EPs) are singularities in non-Hermitian systems where eigenstates coalesce.
  • EPs offer enhanced control over light-matter interactions, but advanced control over single quantum emitters remains challenging.
  • Engineering the quantum vacuum is key to precisely manipulating quantum emitters.

Purpose of the Study:

  • To engineer the quantum vacuum using a chiral exceptional point (EP).
  • To shape the spontaneous emission of a single quantum emitter.
  • To demonstrate advanced control over quantum emitter characteristics via EPs.

Main Methods:

  • Developed a heterogeneously integrated lithium niobate-GaAs photonic circuit.
  • Incorporated high-quality quantum emitters, low-loss photonic circuits, electro-optic modulators, and piezoelectric actuators.
  • Dynamically tuned mode coupling to access EPs and modulate spontaneous emission.

Main Results:

  • Achieved anomalous spontaneous emission dynamics with a sevenfold lifetime modulation (120-850 ps) and tunable chirality.
  • Shaped emission spectra at the single-photon level, generating squared-Lorentzian, Fano-asymmetric, and EP-induced transparency emissions.
  • Demonstrated EP-induced transparency, a suppression of photon emission at zero detuning.

Conclusions:

  • Unveiled uncommon cavity quantum electrodynamics unique to EPs.
  • Showcased the potential of non-Hermitian quantum photonics for high-performance topological quantum light sources.
  • Demonstrated precise control over single quantum emitters through EP engineering.