Bright Electrically Controllable Quantum?Dot?Molecule Devices Fabricated by In Situ Electron?Beam Lithography

Self-organized semiconductor quantum dots represent almost ideal two-level systems, which have strong potential to applications in photonic technologies. For instance, they can act as emitters close-to-ideal light sources. Coupled dot systems with significantly increased functionality are potentially of even stronger interest since be used host ultra-stable singlet-triplet spin qubits for efficient spin-photon interfaces and deterministic 2D cluster-state generation. An advanced molecule (QDM) device is realized excellent optical properties demonstrated. The includes electrically controllable QDMs based on stacked a pin-diode structure. deterministically integrated into structure circular Bragg grating using situ electron beam lithography. A photon extraction efficiency up (24 ± 4)% measured good agreement numerical simulations. coupling character the clearly demonstrated by bias voltage dependent spectroscopy that also controls orbital couplings their charge state quantitative theory. QDM devices show single-photon emission multi-photon suppression g ( 2 ) 0 = 3.9 0.5 × 10 ? 3 . These metrics make developed attractive building blocks use future networks nanophotonic hardware.