Accurate measurement of a 96% input coupling into a cavity using polarization tomography

Abstract

Pillar microcavities are excellent light-matter interfaces providing an electromagnetic confinement in small mode volumes with high quality factors. They also allow the efficient injection and extraction of photons, into and from the cavity, with potentially near-unity input and output-coupling efficiencies. Optimizing the input and output coupling is essential, in particular, in the development of solid-state quantum networks where artificial atoms are manipulated with single incoming photons. Here we propose a technique to accurately measure input and output coupling efficiencies using polarization tomography of the light reflected by the cavity. We use the residual birefringence of pillar microcavities to distinguish the light coupled to the cavity from the uncoupled light: the former participates to rotating the polarization of the reflected beam, while the latter decreases the polarization purity. Applying this technique to a micropillar cavity, we measure a $53\pm 2\%$ output coupling and a $96\pm 1\%$ input coupling with unprecedented precision.

arXiv comment6 pages, 3 figures

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Cited by in corpus (6)

• Reproducibility of high-performance quantum dot single-photon sources
• Brillouin Scattering in Hybrid Optophononic Bragg Micropillar Resonators at 300 GHz
• Deterministic assembly of a charged quantum dot-micropillar cavity device
• Energy-efficient quantum non-demolition measurement with a spin-photon interface
• Hidden anisotropy controls spin-photon entanglement in a charged quantum dot
• Birefringent spin-photon interface generates polarization entanglement