High Purcell Enhancement in Quantum-Dot Hybrid Circular Bragg Grating Cavities for GHz Clock Rate Generation of Indistinguishable Photons
Lucas Rickert, Daniel A. Vajner, Martin von Helversen, Johannes Schall, Sven Rodt, Stephan Reitzenstein, Hanqing Liu, Shulun Li, Haiqiao Ni, Zhichuan Niu, Tobias Heindel
Abstract
High Resolution Image Download MS PowerPoint Slide We present Purcell-enhanced ( F P > 25) semiconductor InAs quantum dot decay times of T 1 < 30 ps, enabled by deterministic hybrid circular Bragg gratings (hCBGs). We investigate the benefits of these short T 1 -times on the two-photon indistinguishability for quasi-resonant and strictly resonant excitation and observe visibilities of ≥96% at 12.5 ns time delay of consecutively emitted photons. The strongly Purcell-enhanced decay times enable a high degree of indistinguishability for elevated temperatures of up to 30 K and, moreover, allow for excitation of up to 1.28 GHz repetition rate. Our work highlights the prospects of highly Purcell-enhanced solid-state quantum emitters for applications in quantum information and technologies operating at GHz clock rates.