Coherently and Incoherently Pumped Telecom C-Band Single-Photon Source with High Brightness and Indistinguishability.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38975638.
- Also identified by DOI 10.1021/acs.nanolett.4c01813.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Long-range, terrestrial quantum networks require high-brightness single-photon sources emitting in the telecom C-band for maximum transmission rates. For solid-state quantum emitters, the underlying pumping process, i.e., coherent or incoherent excitation schemes, impacts several photon properties such as photon indistinguishability, single-photon purity, and photon number coherence. These properties play a major role in quantum communication applications, the latter in particular for quantum cryptography. Here, we present a versatile telecom C-band single-photon source that is operated coherently and incoherently using two complementary pumping schemes. The source is based on a quantum dot coupled to a circular Bragg grating cavity, whereas coherent (incoherent) operation is performed via the novel SUPER scheme (phonon-assisted excitation). In this way, high end-to-end-efficiencies (η<sub>end</sub>) of 5.36% (6.09%) are achieved simultaneously with a small multiphoton contribution <i>g</i><sup>(2)</sup>(0) of 0.076 ± 0.001 [<i>g</i><sup>(2)</sup>(0) of 0.069 ± 0.001] for coherent (incoherent) operation.