posted on 2024-02-05, 14:37authored byXiaoying Huang, Jake Horder, Wei Wen Wong, Naiyin Wang, Yue Bian, Karin Yamamura, Igor Aharonovich, Chennupati Jagadish, Hark Hoe Tan
High-quality
quantum light sources are crucial components for the
implementation of practical and reliable quantum technologies. The
persistent challenge, however, is the lack of scalable and deterministic
single photon sources that can be synthesized reproducibly. Here,
we present a combination of droplet epitaxy with selective area epitaxy
to realize the deterministic growth of single quantum dots in nanowire
arrays. By optimization of the single quantum dot growth and the nanowire
cavity design, single emissions are effectively coupled with the dominant
mode of the nanowires to realize Purcell enhancement. The resonance-enhanced
quantum emitter system boasts a brightness of millions of counts per
second with nanowatt excitation power, a short radiation lifetime
of 350 ± 5 ps, and a high single-photon purity with g(2)(0) value of 0.05 with continuous wave above-band excitation.
Finite-difference time-domain (FDTD) simulation results show that
the emissions of single quantum dots are coupled into the TM01 mode of the nanowires, giving a Purcell factor ≈ 3. Our technology
can be used for creating on-chip scalable single photon sources for
future quantum technology applications including quantum networks,
quantum computation, and quantum imaging.