Observation of large spontaneous emission rate enhancement of quantum dots in a broken-symmetry slow-light waveguide

• URL: http://arxiv.org/abs/2208.06453v1
• Date: Fri, 12 Aug 2022 18:42:16 GMT
• Title: Observation of large spontaneous emission rate enhancement of quantum dots in a broken-symmetry slow-light waveguide
• Authors: Hamidreza Siampour, Christopher O'Rourke, Alistair J. Brash, Maxim N. Makhonin, Ren\'e Dost, Dominic J. Hallett, Edmund Clarke, Pallavi K. Patil, Maurice S. Skolnick, A. Mark Fox
• Abstract summary: We demonstrate a nanophotonic waveguide platform with embedded quantum dots (QDs) The design uses slow-light effects in a glide-plane photonic crystal waveguide with QD tuning to match the emission frequency to the slow-light region. We then demonstrate a 5 fold Purcell enhancement for a dot with high degree of chiral coupling to waveguide modes.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum states of light and matter can be manipulated on the nanoscale to provide a technological resource for aiding the implementation of scalable photonic quantum technologies [1-3]. Experimental progress relies on the quality and efficiency of the coupling between photons and internal states of quantum emitters [4-6]. Here we demonstrate a nanophotonic waveguide platform with embedded quantum dots (QDs) that enables both Purcell-enhanced emission and strong chiral coupling. The design uses slow-light effects in a glide-plane photonic crystal waveguide with QD tuning to match the emission frequency to the slow-light region. Simulations were used to map the chirality and Purcell enhancement depending on the position of a dipole emitter relative to the air holes. The highest Purcell factors and chirality occur in separate regions, but there is still a significant area where high values of both can be obtained. Based on this, we first demonstrate a record large radiative decay rate of 17 ns^-1 (60 ps lifetime) corresponding to a 20 fold Purcell enhancement. This was achieved by electric-field tuning of the QD to the slow-light region and quasi-resonant phonon-sideband excitation. We then demonstrate a 5 fold Purcell enhancement for a dot with high degree of chiral coupling to waveguide modes, substantially surpassing all previous measurements. Together these demonstrate the excellent prospects for using QDs in scalable implementations of on-chip spin-photonics relying on chiral quantum optics.

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