1 research outputs found
Generating indistinguishable photons from a quantum dot in a noisy environment
Single photons from semiconductor quantum dots are promising resources for linear optical quantum
computing, or, when coupled to spin states, quantum repeaters. To realize such schemes, the photons must
exhibit a high degree of indistinguishability. However, the solid-state environment presents inherent obstacles
for this requirement as intrinsic semiconductor fluctuations can destroy the photon indistinguishability. Here,
we demonstrate that resonant excitation of a quantum dot with a narrow-band laser generates near transform
limited power spectra and indistinguishable photons from a single quantum dot in an environment with many
charge-fluctuating traps. The specificity of the resonant excitation suppresses the excited state population in the
quantum dot when it is detuned due to spectral fluctuations. The dynamics of this process lead to flickering of
the emission over long time scales (>5 μs) and reduces the time-averaged count rates. Nevertheless, in spite of
significant spectral fluctuations, high visibility two-photon interference can be achieved. This approach is useful
for quantum dots with nearby surface states in processed photonic structures and quantum emitters in emerging
platforms, such as two-dimensional semiconductors