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

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.

12 pages, 5 figures

References in corpus (10)

• The Quantum Internet
• Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
• A solid-state entangled photon pair source with high brightness and indistinguishability
• On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability
• Coherence of an Entangled Exciton-Photon State
• Bright Purcell enhanced single-photon source in the telecom O-band based on a quantum dot in a circular Bragg grating
• Design study for an efficient semiconductor quantum light source operating in the telecom C-band based on an electrically-driven circular Bragg grating
• Optimizing H1 cavities for the generation of entangled photon pairs
• Numerical optimization of single-mode fiber-coupled single-photon sources based on semiconductor quantum dots
• Triggered telecom C-band single-photon source with high brightness, high indistinguishability and sub-GHz spectral linewidth