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    Methods for preparing entangled quantum states
    1.
    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 Coherent Systems and Operations
    4.
    发明申请
    Quantum Coherent Systems and Operations 失效
    量子相干系统和操作

    公开(公告)号：US20080310000A1

    公开(公告)日：2008-12-18

    申请号：US11658427

    申请日：2005-06-28

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

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

    IPC分类号： G02F3/00 ,  G02F1/01

    CPC分类号： G06N99/002 ,  B82Y10/00

    摘要： Nonlinear elements can efficiently implement quantum information processing systems such as controlled phase shifters, non-absorbing detectors including parity detectors, quantum subspace projections, non-absorbing Bell state analyzers, non-absorbing encoders/entanglers, and fundamental quantum gates such as CNOT gates. The non-absorbing detectors permit improvements in the efficiency of a probabilistic quantum gate by permitting reuse of the same photonic resources during multiple passes through the probabilistic gate.

    摘要翻译： 非线性元件可以有效地实现量子信息处理系统，例如受控移相器，非吸收检测器，包括奇偶检测器，量子子空间投影，非吸收贝尔状态分析器，非吸收编码器/纠缠器，以及诸如CNOT门的基本量子门。 非吸收检测器允许通过在多次通过概率门之间重复使用相同的光子资源来提高概率量子门的效率。

    Detecting one or more photons from their interactions with probe photons in a matter system
    6.
    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。

    Entanglement processes and system
    8.
    发明授权
    Entanglement processes and system 有权
    纠缠过程和系统

    公开(公告)号：US07554080B2

    公开(公告)日：2009-06-30

    申请号：US11632596

    申请日：2005-07-13

    申请人： William J. Munro ,  Timothy P. Spiller ,  Sean D. Barrett ,  Pieter Kok

    发明人： William J. Munro ,  Timothy P. Spiller ,  Sean D. Barrett ,  Pieter Kok

    IPC分类号： H01S4/00 ,  H01S3/00 ,  H01S5/00 ,  G06E3/00

    CPC分类号： G06N99/002 ,  B82Y10/00

    摘要： The states of matter system (110) having only ones basis state that couples to an excited state can be entangled using measurements of photons during transitions from the excited state. High efficiency of entanglement operation can be achieved by repeating the measurements after performing bit flips on the matter systems (110). High efficiency of entanglement operation can be achieved using non-absorbing parity measurements on the emitted photons so that measured photons can be subsequently manipulated and measured to near-deterministically produce entangled states. Such entanglement operations can be employed to construct cluster states suitable for simulating arbitrary logic networks.

    摘要翻译： 只有具有耦合到激发态的基础状态的物质系统（110）的状态可以使用从激发态转变期间的光子的测量来纠缠。 可以通过在物质系统（110）上执行位翻转之后重复测量来实现纠缠操作的高效率。 可以使用发射的光子上的非吸收奇偶校验测量来实现纠缠操作的高效率，使得随后可以操作和测量测量的光子以接近确定地产生纠缠状态。 可以采用这种纠缠操作来构建适合于模拟任意逻辑网络的聚类状态。

    Methods for determining relative phase differences in entangled quantum states
    9.
    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。