An integrated whispering-gallery-mode resonator for solid-state coherent quantum photonics

Abstract

Tailored photonic cavities allow enhancing light-matter interaction ultimately to create a fully coherent quantum interface. Here, we report on an integrated microdisk cavity containing self-assembled quantum dots to coherently route photons between different access waveguides. We measure a Purcell factor of $F_{exp}=6.9\pm 0.9$ for a cavity quality factor of about 10,000, allowing us to observe clear signatures of coherent scattering of photons by the quantum dots. We show how this integrated system can coherently re-route photons between the drop and bus ports, and how this routing is controlled by detuning the quantum dot and resonator, or through the strength of the excitation beam, where a critical photon number less than one photon per lifetime is required. We discuss the strengths and limitations of this approach, focusing on how the coherent scattering and single-photon nonlinearity can be used to increase the efficiency of quantum devices such as routers or Bell-state analyzers.

References in corpus (11)

• Quantum nature of a strongly-coupled single quantum dot-cavity system
• Chiral Quantum Optics
• Linear and nonlinear optical spectroscopy of a strongly-coupled microdisk-quantum dot system
• Quantum optical circulator controlled by a single chirally coupled atom
• Electric-field-induced coherent coupling of the exciton states in a single quantum dot
• Giant Optical Non-linearity induced by a Single Two-Level System interacting with a Cavity in the Purcell Regime
• Size-Dependence of the Wavefunction of Self-Assembled Quantum Dots
• Wavelength- and material-dependent absorption in GaAs and AlGaAs microcavities
• Miniature GaAs disk resonators probed by a looped fiber taper for optomechanics applications
• Suppression of surface-related loss in a gated semiconductor microcavity
• Electroabsorption in gated GaAs nanophotonic waveguides