Abstract
Recent progress in quantum nanophotonics brings novel ways for manipulating single photons in various nano-waveguides. Among them, one promising approach is to use optical nanofibres (ONFs), tapered optical fibres with sub-wavelength diameter waists. Here, we develop a hybrid system of an ONF and a single quantum dot (QD) operated at cryogenic temperatures. We deposit a single colloidal CdSe QD on an ONF waist and observe emitted photons through the fibre guided modes. We systematically investigate emission characteristics for both the neutral exciton and charged exciton (trion) for one specific QD. We quantitatively show that the trion at cryogenic temperatures acts as an excellent quantum emitter for the ONF and QD hybrid system. The present ONF/QD hybrid system at cryogenic temperatures paves the way for quantum information technologies for manipulating single photons in fibre networks.
Highlights
Radiative decay time than that of the exciton transition for neutral nanocrystals[28,30]
We develop a hybrid system of an optical nanofibres (ONFs) and a single thick shell colloidal CdSe quantum dot (QD), which is operated at cryogenic temperatures
The hybrid system of an ONF and a single thick shell CdSe QD at cryogenic temperatures paves the way for quantum information technologies for manipulating single photons in fibre networks
Summary
Radiative decay time than that of the exciton transition for neutral nanocrystals[28,30]. These previous investigations have been performed for QDs cast on a glass plate using microscope observation Such measurement conditions are far from the real situation for photonic applications. In quantum information technologies, cryogenic technologies are becoming a standard method through superconducting single photon detectors[31] In this view, it would be valuable to explore novel quantum photonic systems by extending the working condition to cryogenic temperatures. We develop a hybrid system of an ONF and a single thick shell colloidal CdSe QD, which is operated at cryogenic temperatures. This system situation can be readily extended to photonic applications in fibre networks. The hybrid system of an ONF and a single thick shell CdSe QD at cryogenic temperatures paves the way for quantum information technologies for manipulating single photons in fibre networks
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