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189 条记录 (耗时 0.039 秒)

    Detecting one or more photons from their interactions with probe photons in a matter system
    1.
    发明授权
    Detecting one or more photons from their interactions with probe photons in a matter system 有权
    检测一个或多个光子与物质系统中与探针光子的相互作用

    公开(公告)号：US07002133B2

    公开(公告)日：2006-02-21

    申请号：US10678437

    申请日：2003-10-03

    申请人： Raymond G. Beausoleil ,  William J. Munro ,  Timothy P. Spiller ,  Kae Nemoto ,  Sean D. Barrett

    发明人： Raymond G. Beausoleil ,  William J. Munro ,  Timothy P. Spiller ,  Kae Nemoto ,  Sean D. Barrett

    IPC分类号： H01L31/00

    CPC分类号： G06N99/002 ,  B82Y10/00

    摘要： A device capable of efficiently detecting a single-photon signal includes a matter system, sources of a first beam and a second beam, and a measurement system. The matter system has a first energy level and a second energy level such that a signal photon couples to a transition between the first energy level and the second energy level. The first beam contains photons that couple to a transition between the second energy level and a third energy level of the matter system, and the second beam contains photons that couple to a transition between the third energy level and a fourth energy level of the matter system. The measurement system measures a change in the first or second beam to detect the absence, the presence, or the number of the photons in the signal.

    摘要翻译： 能够有效地检测单光子信号的装置包括物质系统，第一光束和第二光束的源以及测量系统。 物质系统具有第一能级和第二能级，使得信号光子耦合到第一能级和第二能级之间的转变。 第一光束包含耦合到物质系统的第二能级与第三能级之间的转变的光子，而第二光束包含耦合到物质系统的第三能级与第四能级之间的跃迁的光子 。 测量系统测量第一或第二光束的变化，以检测信号中光子的不存在，存在或数量。

    Methods for determining relative phase differences in entangled quantum states
    2.
    发明授权
    Methods for determining relative phase differences in entangled quantum states 失效
    确定纠缠量子态相对相位差的方法

    公开(公告)号：US07426444B2

    公开(公告)日：2008-09-16

    申请号：US11407600

    申请日：2006-04-19

    申请人： Raymond G. Beausoleil ,  William J. Munro ,  Timothy P. Spiller ,  Pieter Kok ,  Sean D. Barrett ,  Kae Nemoto

    发明人： Raymond G. Beausoleil ,  William J. Munro ,  Timothy P. Spiller ,  Pieter Kok ,  Sean D. Barrett ,  Kae Nemoto

    IPC分类号： G01R13/00

    CPC分类号： B82Y10/00 ,  G06N99/002

    摘要： Various embodiments of the present invention are directed to methods for determining a phase shift acquired by an entangled N-qubit system represented by a NOON state. In one embodiment, a probe electromagnetic field is coupled with each qubit system. The phase shift acquired by the qubit systems is transferred to the probe electromagnetic field by transforming each qubit-system state into a linear superposition of qubit basis states. An intensity measurement is performed on the probe electromagnetic field in order to obtain a corresponding measurement result. A counter associated with a measurement-result interval is incremented, based on the measurement result falling within the measurement-result interval. A frequency distribution is produced by normalizing the counter associated with each measurement-result interval for a number of trials. The phase shift is determined by fitting a probability distribution associated with the probe electromagnetic field to the frequency distribution as a function of the phase shift.

    摘要翻译： 本发明的各种实施例涉及用于确定由NOON状态表示的纠缠的N量子比特系统获取的相移的方法。 在一个实施例中，探测电磁场与每个量子位系统耦合。 通过将每个量子位系统状态转换为量子位基状态的线性叠加，由量子位系统获取的相移被传送到探测电磁场。 对探头电磁场进行强度测量，以获得相应的测量结果。 基于测量结果间隔内的测量结果，与测量结果间隔相关联的计数器增加。 通过对与多个试验的每个测量结果间隔相关联的计数器进行归一化来产生频率分布。 通过将与探测电磁场相关联的概率分布拟合为频率分布来确定相移作为相移的函数。

    Methods for preparing entangled quantum states
    9.
    发明授权
    Methods for preparing entangled quantum states 有权
    制备纠缠量子态的方法

    公开(公告)号：US07836007B2

    公开(公告)日：2010-11-16

    申请号：US11343639

    申请日：2006-01-30

    申请人： Raymond G. Beausoleil ,  William J. Munro ,  Timothy P. Spillar ,  Pieter Kok ,  Sean D. Barrett ,  Kae Nemoto

    发明人： Raymond G. Beausoleil ,  William J. Munro ,  Timothy P. Spillar ,  Pieter Kok ,  Sean D. Barrett ,  Kae Nemoto

    IPC分类号： G06F15/00 ,  G06F15/18

    CPC分类号： B82Y10/00 ,  G06N99/002

    摘要： Various embodiments of the present invention are directed to methods for generating an entangled state of qubits. In one embodiment of the present invention, a method for preparing an entangled state of qubits comprises providing a probe and N non-interacting qubits, each qubit comprises a linear superposition of two basis states. The probe is transmitted into an interaction region that separately couples the probe to each of the qubits and produces a number of different probes. A linear superposition of states is output from the interaction region, each state in the linear superposition of states comprises a tensor product of entangled basis states and one of the different probes. The linear superposition of states is projected into one of the entangled states by measuring the state of the probe.

    摘要翻译： 本发明的各种实施例涉及用于产生量子位的纠缠状态的方法。 在本发明的一个实施例中，用于准备量子比特的纠缠状态的方法包括提供探测器和N个非相互作用的量子位，每个量子位包括两个基本状态的线性叠加。 探针被传输到相互作用区域中，该区域将探针分别耦合到每个量子位并产生许多不同的探针。 从交互区域输出状态的线性叠加，状态的线性叠加中的每个状态包括纠缠基状态的张量乘积和不同探针中的一个。 通过测量探针的状态将状态的线性叠加投影到纠缠状态之一。

    Quantum information processing using electromagnetically induced transparency
    10.
    发明授权
    Quantum information processing using electromagnetically induced transparency 有权
    使用电磁感应透明度的量子信息处理

    公开(公告)号：US07560726B2

    公开(公告)日：2009-07-14

    申请号：US10364987

    申请日：2003-02-11

    申请人： Raymond G. Beausoleil ,  Adrian P. Kent ,  Philip J. Kuekes ,  William J. Munro ,  Timothy P. Spiller ,  R. Stanley Williams

    发明人： Raymond G. Beausoleil ,  Adrian P. Kent ,  Philip J. Kuekes ,  William J. Munro ,  Timothy P. Spiller ,  R. Stanley Williams

    IPC分类号： H01J40/14

    CPC分类号： B82Y10/00 ,  G06N99/002

    摘要： Quantum information processing structures and methods use photons and four-level matter systems in electromagnetically induced transparency (EIT) arrangements for one and two-qubit quantum gates, two-photon phase shifters, and Bell state measurement devices. For efficient coupling of the matter systems to the photons while decoupling the matter systems from the phonon bath, molecular cages or molecular tethers maintain the atoms within the electromagnetic field of the photon, e.g., in the evanescent field surrounding the core of an optical fiber carrying the photons. To reduce decoherence caused by spontaneous emissions, the matter systems can be embedded in photonic bandgap crystals or the matter systems can be selected to include metastable energy levels.

    摘要翻译： 量子信息处理结构和方法使用光子和四级物质系统在一个和两个量子位量子门，双光子移相器和贝尔状态测量装置的电磁感应透明度（EIT）布置中。 为了将物质系统有效耦合到光子，同时将物质系统与声子浴解耦，分子笼或分子系链将原子保持在光子的电磁场内，例如在包含光纤的纤芯的周围的消逝场中 光子。 为了减少由自发辐射引起的去相干，物质系统可以嵌入光子带隙晶体中，或者可以选择物质系统来包括亚稳态能级。