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    • 7. 发明公开
    • Single-photon sources
    • Einzelphotonenquellen
    • EP2202550A1
    • 2010-06-30
    • EP08172894.1
    • 2008-12-24
    • Hitachi Ltd.
    • Xu, XiulaiWilliams, David
    • G02B6/42G06N99/00
    • G06N99/002B82Y10/00B82Y20/00G02B6/4249H01S5/02284H01S5/1042H01S5/3412H01S5/423H04B10/70H04L9/0852
    • Apparatus comprises at least two single-photon sources (3) supported on a common substrate (4), each photon source comprising a pillar (5) upstanding from the substrate in a first direction and in which a quantum dot (6) is disposed within a cavity (7) formed between two mirrors (8, 9), the pillar having a light-emitting surface (10). The apparatus also comprises an optical fibre bundle (11) comprising at least two optical fibres (12) having light-receiving ends (15) and a jig (17) for removably coupling the light receiving ends to the light emitting surfaces. The cavities each have a quality factor of at least 10 5 and the pillars have a diameter in a second, transverse direction such that the cavities exhibit the same optical mode. Controlling the optical modes of the cavities in the first and second directions helps to limit the characteristics of photons emitted by the photon sources so that the photons are indistinguishable.
    • 装置包括支撑在公共衬底(4)上的至少两个单光子源(3),每个光子源包括在第一方向上从衬底直立的柱(5),并且其中量子点(6)设置在其内 形成在两个反射镜(8,9)之间的空腔(7),所述柱具有发光表面(10)。 该装置还包括光纤束(11),其包括至少两个具有光接收端(15)的光纤(12)和用于将光接收端可拆卸地耦合到发光表面的夹具(17)。 每个孔的质量因子至少为10 5,并且柱具有在第二横向方向上的直径,使得空腔呈现相同的光学模式。 在第一和第二方向控制空腔的光学模式有助于限制由光子源发射的光子的特性,使得光子是不可区分的。
    • 10. 发明公开
    • QUANTUM LEAKAGE
    • 量子泄漏
    • EP3264339A1
    • 2018-01-03
    • EP16176751.2
    • 2016-06-28
    • Hitachi, Ltd.
    • Andreev, AlekseyWilliams, David
    • G06N99/00
    • G06N99/002
    • A method of reducing quantum leakage in a qubit device is disclosed. The method comprises receiving a set of energy level values for a multi-level system which includes first and second working levels |o>, |1> which provide a qubit and at least one other level |2> and performing an iteration at least once. the iteration comprising determining quantum leakage from at least one of the first and second working levels to the at least one non-working level for a quantum operation A comprising at least one pulse wherein each pulse has a respective pulse duration, determining whether the quantum leakage is greater than or equal to a threshold value; and, in dependence on the quantum leakage being greater than or equal to the threshold value, changing the duration of at least one of the at least one pulse.
    • 公开了一种减小量子位器件中的量子泄漏的方法。 该方法包括:接收用于多级系统的一组能级值,该多级系统包括提供量子位和至少一个其他级| 2>的第一和第二工作级| o>,并且执行至少一次迭代 。 所述迭代包括确定量子操作A从第一和第二工作电平中的至少一个到至少一个非工作电平的量子泄漏,量子操作A包括至少一个脉冲,其中每个脉冲具有相应的脉冲持续时间,确定量子泄漏 大于或等于阈值; 并且根据量子泄漏大于或等于阈值,改变至少一个脉冲中的至少一个的持续时间。