Partitioning of on-demand electron pairs
Partitioning of on-demand electron pairs
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DOI：
10.1038/nnano.2014.275
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发表时间：
2015-01-01
影响因子：
38.3
通讯作者：
Haug, Rolf J.
中科院分区：
文献类型：
--
作者：
Ubbelohde, Niels;Hohls, Frank;Haug, Rolf J.
纠缠光子对的按需产生和分离是量子光学中量子信息处理的关键组成部分（1 - 3）。在电子类似物中，电子对的分解是在电子量子光学中利用弹道电子的量子态的一个基本构建模块（4 - 7）。电子散射已被用于在汉伯里·布朗和特维斯实验中探测随机源的粒子统计特性（8，9），并且按需源的最新出现进一步提供了在 Hong - Ou - Mandel实验中实现多个源之间不可区分性的可能性（10 - 15）。库珀对随机撞击介观分束器已被成功分割，这通过测量到达的符合情况得到了验证（16 - 21）。在此，我们展示了按需产生的电子对的分裂。符合关联测量允许重建全计数统计，揭示统计独立、可区分或相关分配的机制，并且已被设想为电子对量子态信息的一个来源（22 - 26）。高的电子对分裂保真度为未来从适当制备的双电子量子点基态按需产生自旋纠缠电子对开辟了一条道路。
The on-demand generation and separation of entangled photon pairs are key components of quantum information processing in quantum optics(1-3). In an electronic analogue, the decomposition of electron pairs represents an essential building block for using the quantum state of ballistic electrons in electron quantum optics(4-7). The scattering of electrons has been used to probe the particle statistics of stochastic sources in Hanbury Brown and Twiss experiments(8,9) and the recent advent of on-demand sources further offers the possibility to achieve indistinguishability between multiple sources in Hong-Ou-Mandel experiments(10-15). Cooper pairs impinging stochastically at a mesoscopic beamsplitter have been successfully partitioned, as verified by measuring the coincidence of arrival(16-21). Here, we demonstrate the splitting of electron pairs generated on demand. Coincidence correlation measurements allow the reconstruction of the full counting statistics, revealing regimes of statistically independent, distinguishable or correlated partitioning, and have been envisioned as a source of information on the quantum state of the electron pair(22-26). The high pair-splitting fidelity opens a path to future on-demand generation of spin-entangled electron pairs from a suitably prepared two-electron quantum-dot ground state.