Circular photonic crystal grating design for charge-tunable quantum light sources in the telecom C-band

• URL: http://arxiv.org/abs/2401.01447v2
• Date: Fri, 12 Jan 2024 14:46:12 GMT
• Title: Circular photonic crystal grating design for charge-tunable quantum light sources in the telecom C-band
• Authors: Chenxi Ma, Jingzhong Yang, Pengji Li, Eddy P. Rugeramigabo, Michael Zopf, Fei Ding
• Abstract summary: Efficient generation of entangled photon pairs at telecom wavelengths is a key ingredient for long-range quantum networks. We propose and analyze hybrid circular photonic crystal gratings, incorporating air holes to facilitate charge carrier transport.
• Score: 3.239150403933964
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Efficient generation of entangled photon pairs at telecom wavelengths is a key ingredient for long-range quantum networks. While embedding semiconductor quantum dots into hybrid circular Bragg gratings has proven effective, it conflicts with $p$-$i$-$n$ diode heterostructures which offer superior coherence. We propose and analyze hybrid circular photonic crystal gratings, incorporating air holes to facilitate charge carrier transport without compromising optical properties. Through numerical simulations, a broad cavity mode with a Purcell factor of 23 enhancing both exciton and biexciton transitions, and exceptional collection efficiency of 92.4% into an objective with numerical aperture of 0.7 are achieved. Furthermore, our design demonstrates direct coupling efficiency over 90% into a single-mode fiber over the entire telecom C-band. The hybrid circular photonic crystal grating thereby emerges as a promising solution for the efficient generation of highly coherent, polarization-entangled photon pairs.

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