超亮单光子源驱动的纠缠量子逻辑门
An entangling quantum-logic gate operated with an ultrabright single photon-source
摘要：
我们展示了由超亮固态单光子源驱动的光子量子逻辑门的明确纠缠操作。由微柱光学腔中的单个半导体量子点发射的不可区分的单光子被用作目标和控制量子比特。对于0.56个收集光子/脉冲的源亮度，测量的真值表与68.4%的理想情况重叠，对于0.17个光子/脉冲的源亮度增加到73.0%。大门被缠住了：在光源亮度为0.48时，贝尔态保真度高于纠缠阈值50%，在光源亮度为0.15时达到71.0%。
英文摘要：
We demonstrate unambiguous entangling operation of a photonic quantum-logic gate driven by an ultrabright solid-state single-photon source. Indistinguishable single photons emitted by a single semiconductor quantum dot in a micropillar optical cavity are used as target and control qubits. For a source brightness of 0.56 collected photons-per-pulse, the measured truth table has an overlap with the ideal case of 68.4%, increasing to 73.0% for a source brightness of 0.17 photons- per-pulse. The gate is entangling: at a source brightness of 0.48, the Bell-state fidelity is above the entangling threshold of 50%, and reaches 71.0% for a source brightness of 0.15.
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