Inverse design of a polarization demultiplexer for on-chip path-entangled photon-pair sources based on single quantum dots

Published

August 21, 2023

Author(s)

Emerson Melo, William Eshbaugh, Edward Flagg, Marcelo Davanco

Abstract

Epitaxial quantum dots can emit polarization-entangled photon pairs. If orthogonal polarizations are converted to independent paths, then the photons will be path entangled. We use an inverse design approach with adjoint method optimization to produce a nanophotonic geometry that efficiently couples orthogonally polarized transition dipole moments of a single embedded quantum dot to two independent waveguides. An optimized quantum dot polarization demultiplexer is predicted to feature 95 % coupling efficiency, a cross-talk of <0.1 %, and a Purcell radiative rate enhancement factor over 11.5. The performance is robust to misalignment of the quantum dot position and orientation within the tolerances of current fabrication techniques.

Citation

Optics Letters

Volume

48

Issue

17

Pub Type

Journals

Download Paper

https://doi.org/10.1364/OL.496129

Local Download

Keywords

Nanophotonics, quantum emitters, inverse design, entanglement

Citation

Melo, E. , Eshbaugh, W. , Flagg, E. and Davanco, M. (2023), Inverse design of a polarization demultiplexer for on-chip path-entangled photon-pair sources based on single quantum dots, Optics Letters, [online], https://doi.org/10.1364/OL.496129, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=936569 (Accessed October 9, 2025)