Time-bin entangled photons from a quantum dot.

Time-bin entangled photons from a quantum dot.
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DOI:
10.1038/ncomms5251
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发表时间:
2014-06-26
影响因子:
16.6
通讯作者:
Weihs, Gregor
Weihs, Gregor
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Jayakumar, Harishankar;Predojevic, Ana;Kauten, Thomas;Huber, Tobias;Solomon, Glenn S.;Weihs, Gregor

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远距离量子通信是量子信息科学研究的主要目标之一。利用以光子量子态编码的信息,现有的电信光纤网络可以有效地用作传输介质。为了实现这一目标,需要一个鲁棒的纠缠单光子对源。在这里,我们报道了在III/V自组装量子点中利用双激子-激子级联实现时间bin纠缠光子对的源。我们通过固有相位稳定干涉技术分析产生的光子对,促进不间断的长积分时间。我们通过对发射的光子进行量子态断层扫描来确认纠缠,其保真度为0.69(3),并发度为0.41(6),我们实现了来自单个量子发射器的时间-能量纠缠。
Long distance quantum communication is one of the prime goals in the field of quantum information science. With information encoded in the quantum state of photons, existing telecommunication fibre networks can be effectively used as a transport medium. To achieve this goal, a source of robust entangled single photon pairs is required. Here, we report the realization of a source of time-bin entangled photon pairs utilizing the biexciton-exciton cascade in a III/V self-assembled quantum dot. We analyse the generated photon pairs by an inherently phase-stable interferometry technique, facilitating uninterrupted long integration times. We confirm the entanglement by performing quantum state tomography of the emitted photons, which yields a fidelity of 0.69(3) and a concurrence of 0.41(6) for our realization of time-energy entanglement from a single quantum emitter.
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发表时间: 2012-02-07
影响因子: 16.6
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