2 research outputs found
Deterministic and Robust Generation of Single Photons from a Single Quantum Dot with 99.5% Indistinguishability Using Adiabatic Rapid Passage
Single photons are attractive candidates
of quantum bits (qubits)
for quantum computation and are the best messengers in quantum networks.
Future scalable, fault-tolerant photonic quantum technologies demand
both stringently high levels of photon indistinguishability and generation
efficiency. Here, we demonstrate deterministic and robust generation
of pulsed resonance fluorescence single photons from a single semiconductor
quantum dot using adiabatic rapid passage, a method robust against
fluctuation of driving pulse area and dipole moments of solid-state
emitters. The emitted photons are background-free, have a vanishing
two-photon emission probability of 0.3% and a raw (corrected) two-photon
Hong–Ou–Mandel interference visibility of 97.9% (99.5%),
reaching a precision that places single photons at the threshold for
fault-tolerant surface-code quantum computing. This single-photon
source can be readily scaled up to multiphoton entanglement and used
for quantum metrology, boson sampling, and linear optical quantum
computing
Single InAs Quantum Dot Grown at the Junction of Branched Gold-Free GaAs Nanowire
We
report a new type of single InAs quantum dot (QD) embedded at
the junction of gold-free branched GaAs/AlGaAs nanowire (NW) grown
on silicon substrate. The photoluminescence intensity of such QD is
∼20 times stronger than that from randomly distributed QD grown
on the facet of straight NW. Sharp excitonic emission is observed
at 4.2 K with a line width of 101 μeV and a vanishing two-photon
emission probability of <i>g</i><sup>2</sup>(0) = 0.031(2).
This new nanostructure may open new ways for designing novel quantum
optoelectronic devices