Abstract
In recent years, many groups and institutions have been committed to the research of integrated quantum photonic circuit technologies, of which the key components are waveguide coupled single photon sources. In this study, we propose an on-chip waveguide-coupled single photon source that is easily implemented as the waveguide is directly made from the quantum dot membrane. In order to scatter light out of the on-chip waveguide plane into the detection apparatus, grating output couplers are made at both ends of the waveguide. The photon statistics of the on-chip photon source were investigated by second-order correlation function g(2)(τ) measurements using a Hanbury Brown and Twiss interferometer. From the spectra and cross-correlation experiments by collecting emission at the point of quantum dot and out coupler, the emitting of single photons from the same quantum dot and propagating via the waveguide to the out couplers was confirmed. These results show that we have achieved an on-chip single photon source that is easily implemented and easily integrated into quantum photonic circuits.
Highlights
Accepted: 8 January 2021In the research fields of quantum information and quantum communications, single photons have attracted significant attention as they are fundamental elements for current quantum technologies [1,2,3]
The photoluminescence intensity collected at the point of the output coupler, which was estimated to be larger by the finite difference time domain (FDTD) simulated results, was less than that collected at the point of quantum dots (QDs)
A simple model of on-chip single photon source with a self-assembled quantum dot directly coupled with on-chip waveguide has been demonstrated in this paper, which is a key step toward realizing QD-based quantum photonic circuits
Summary
In the research fields of quantum information and quantum communications, single photons have attracted significant attention as they are fundamental elements for current quantum technologies [1,2,3]. Quantum technologies are undergoing a revolution as the research on integrated quantum photonic circuits (QPCs) opens up exciting opportunities to implement complex quantum algorithms on single chips. For realization of QPCs, single photon sources and processing devices as well as photon detectors have to be combined together on single chips. The single photon sources need to be integrated into quantum photonic circuits to realize on-chip systems by directly coupling with nanophotonic devices via low loss waveguides. An efficient coupling of single photon sources with waveguides remains an attracting issue, as the waveguide coupled single photon source is the key component of a QPC. Many efforts to place single photon sources in or on waveguides have been reported based on single photons generated from the NV-center in nano-diamonds [4], quantum dots (QDs) [5,6], and single walled carbon nanotubes [7]
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