Clemens Matthiesen, Martin Geller, Carsten H. H. Schulte, Claire Le Gall, Jack Hansom, Zhengyong Li, Maxime Hugues, Edmund Clarke, Mete Atatüre
Significant progress has been reported within quantum information science for quantum-dot spins as stationary qubits including long spin coherence times and ultrafast optical manipulation capabilities. A successful realization of a solid-state quantum network relies on quantum-optical coupling of distributed spins. The quality of photons as flying qubits, however, remained systematically below par due to detrimental effects of the solid-state environment on the photon generation process casting a major challenge on this roadmap today. Recently, the coherent component of resonance fluorescence has been observed from a single quantum dot promising a fully coherent single photon scattering channel for interfacing spins and photons with suppressed environment effects. Here, we first demonstrate that the coherently generated single photons display mutual coherence with the excitation laser on a timescale exceeding 3 seconds. Exploiting this degree of mutual coherence we synthesize near-arbitrary single photon wavepackets by controlling the waveform of the excitation laser field. Fundamentally differing from post-emission filtering, our technique circumvents both photon loss and degradation of the single photon nature for all synthesized waveforms. We further demonstrate that separate photons generated coherently by the same laser field are fundamentally indistinguishable. Photons generated from spin-selective transitions will allow the realization of a high-fidelity spin-photon interface, as well as a distributed quantum network comprising even disparate nodes.
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http://arxiv.org/abs/1208.1689
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