A Broadband Nanowire Quantum Dot Cavity Design for the Efficient Extraction of Entangled Photons
- URL: http://arxiv.org/abs/2601.04440v1
- Date: Wed, 07 Jan 2026 22:53:39 GMT
- Title: A Broadband Nanowire Quantum Dot Cavity Design for the Efficient Extraction of Entangled Photons
- Authors: Sayan Gangopadhyay, Sasan V. Grayli, Sathursan Kokilathasan, Michael E. Reimer,
- Abstract summary: A bright source of on-demand entangled photons is needed for quantum networks.<n>A single quantum dot in a site-selected nanowire waveguide is a promising candidate for realizing such sources.<n>We propose a nanowire cavity based on quasi-bound states in the continuum formed by the strong coupling of two resonant optical modes.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: A bright source of on-demand entangled photons is needed for quantum networks. A single quantum dot in a site-selected nanowire waveguide is a promising candidate for realizing such sources. However, such sources are associated with poor single-photon indistinguishability, limiting their applicability in quantum networks. A common approach for enhancing the single-photon indistinguishability in quantum dot-based entangled photon sources is to implement a broadband optical cavity. Achieving a high-Purcell cavity while retaining the advantages of the nanowire, such as directional emission, a broad operational bandwidth, and high light extraction efficiency, has been a significant challenge. Here, we propose a nanowire cavity based on quasi-bound states in the continuum formed by the strong coupling of two resonant optical modes. We numerically predict this design to support a cavity mode with 4 nm bandwidth and a Purcell enhancement of $\sim$17. This cavity mode enables a directional far-field emission profile (88% overlap with a Gaussian) with a light extraction efficiency of $\sim$74%. Our solution opens up a route for generating entangled photon pairs with enhanced extraction efficiency and single-photon indistinguishability for the practical realization of quantum networks.
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