Maximally entangled and GHz-clocked on-demand photon pair source

Abstract

We present a 1 GHz-clocked, maximally entangled and on-demand photon pair source based on droplet etched GaAs quantum dots using two-photon excitation. By employing these GaP microlensenhanced devices in conjunction with their substantial brightness, raw entanglement fidelities of up to $0.95\pm 0.01$ and post-selected photon indistinguishabilities of up to $0.93\pm 0.01$, the suitability for quantum repeater based long range quantum entanglement distribution schemes is shown. Comprehensive investigations of a complete set of polarization selective two-photon correlations as well as time resolved Hong-Ou-Mandel interferences facilitate innovative methods that determine quantities such as photon extraction and excitation efficiencies as well as pure dephasing directly - opposed to commonly employed indirect techniques.

arXiv comment9 pages, 10 figures

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• High Purcell-enhancement in quantum-dot hybrid circular Bragg grating cavities for GHz-clockrate generation of indistinguishable photons
• Wavelength-tunable high-fidelity entangled photon sources enabled by dual Stark effects
• Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution
• Dressed-state analysis of two-color excitation schemes
• A multipair-free source of entangled photons in the solid state
• Deterministic preparation of spin qubits in droplet etched GaAs quantum dots using quasi-resonant excitation
• Two-photon excitation with finite pulses unlocks pure dephasing-induced degradation of entangled photons emitted by quantum dots
• Time-bin entanglement in the deterministic generation of linear photonic cluster states
• Statistical limits for quantum networks with semiconductor entangled photon sources