Mode-Matched Resonant Excitation of a Nanowire Quantum Dot in a Nanophotonic Waveguide.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41277757.
- Also identified by DOI 10.1021/acs.nanolett.5c04530 and PMC identifier 12874642.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Nanowire-based quantum dots as sources of single photons are promising candidates for the implementation of quantum photonic technologies. Achieving coherent control of these sources is essential for generating indistinguishable single photons─a key requirement for quantum interference. However, coherent excitation of nanowire quantum dots via resonant pumping has remained a long-standing challenge due to high laser suppression requirements. Here we establish a reliable technique to implement resonant excitation of a quantum dot in a tapered single-mode nanowire waveguide by complementing polarization-rejection with mode-matching to minimize the amount of backscattered laser. We demonstrate low multiphoton emission [<i>g</i><sub><i>X</i></sub><sup>(2)</sup>(0) = 0.019] and multiple Rabi oscillations under pulsed resonant excitation. We also report on two-photon indistinguishability under resonant excitation, achieving an interference visibility of 41%. This is a significant improvement over incoherent excitation and represents an important step in the development of a scalable approach for producing coherent single-photon sources.