公开(公告)号：EP2427994B1

公开(公告)日：2013-09-25

申请号：EP09743889.9

申请日：2009-10-26

申请人： Hewlett-Packard Development Company, L.P. ,  Inter-University Research Institute Corporation Research Organization of Information and Systems

发明人： HARRISON, Keith Alexander ,  MUNRO, William ,  NEMOTO, Kae

IPC分类号： H04B10/70

CPC分类号： H04L9/0855 ,  B82Y10/00 ,  G06N99/002 ,  H04B10/70 ,  H04L2209/38

公开(公告)号：EP1922676A2

公开(公告)日：2008-05-21

申请号：EP06801268.1

申请日：2006-08-11

申请人： Hewlett-Packard Development Company, L.P. ,  National Institute of Informatics

发明人： MUNRO, William, J. ,  NEMOTO, Kae ,  VAN LOOCK, Peter ,  YAMAMOTO, Yoshihisa

IPC分类号： G06N1/00

CPC分类号： G06N99/002 ,  B82Y10/00 ,  H04B10/291 ,  H04B10/70 ,  H04L9/0855

摘要： A quantum repeater includes a transmitter portion including a source, a set of matter systems, and an optical system. The source produces a probe pulse in a probe state having components with different photon numbers, and each matter system has at least one state that interacts with photons in the probe pulse to introduce a change in a phase space location of the probe state. The optical system can direct the probe pulse for interaction with one of the matter systems and direct light from the matter system for transmission on a first channel.

公开(公告)号：EP1787100A2

公开(公告)日：2007-05-23

申请号：EP05764613.5

申请日：2005-06-28

申请人： Hewlett-Packard Development Company, L.P.

发明人： BEAUSOLEIL, Raymond G, ,  MUNRO, William J, ,  SPILLER, Timothy P, ,  BARRETT, Sean ,  KOK, Pieter ,  NEMOTO, Kae

IPC分类号： G01N1/00

CPC分类号： G06N99/002 ,  B82Y10/00

摘要： Nonlinear electromagnetic elements (210) can efficiently implement quantum information processing tasks such as controlled phase shifts, non-demolition state detection, quantum subspace projections, non-demolition Bell state analysis, heralded state preparation, quantum non-demolition encoding, and fundamental quantum gate operations. Direct use of electromsgnetic non-linearity can amplify small phase shifts and use feed forward systems (900) in a near deterministic manner with high operating efficiency. Measurements using homodyne detectors (530) can cause near deterministic projection of input states on a Hilbert subspace identified by the measurement results. Feed forward operation can then alter the projected state if desired to achieve a desired output with near 100% efficiency.

公开(公告)号：EP2427994A1

公开(公告)日：2012-03-14

申请号：EP09743889.9

申请日：2009-10-26

申请人： Hewlett-Packard Development Company, L.P. ,  National Institute of Informatics

发明人： HARRISON, Keith Alexander ,  MUNRO, William ,  NEMOTO, Kae

IPC分类号： H04L9/08

CPC分类号： H04L9/0855 ,  B82Y10/00 ,  G06N99/002 ,  H04B10/70 ,  H04L2209/38

摘要： A method and apparatus (70) are provided for creating an entanglement between two qubits situated in spaced nodes (71, 72) and coupled by an optical channel (75). One node (71) supports a plurality of qubits (73) and is arranged to pass a respective light field through each qubit and on into the optical channel (75), so as to produce a train (78) of closely-spaced lightfields on the optical channel (75). The other node (72) supports a target qubit (74) and is arranged to receive the light-field train (78), to allow each successive light field to pass through, and potentially interact with, the target qubit (74) while the latter remains un-entangled, and to thereafter measure each light field to determine whether the latter has been successfully entangled. Upon the second node (72) determining that the target qubit (74) has become entangled, it inhibits the interaction of further light fields with the target qubit.

公开(公告)号：EP1941428A2

公开(公告)日：2008-07-09

申请号：EP06788134.2

申请日：2006-07-21

申请人： Hewlett-Packard Development Company, L.P.

发明人： BEAUSOLEIL, Raymond, G. ,  MUNRO, William, J. ,  SPILLER, Timothy, P. ,  NEMOTO, Kae

IPC分类号： G06N1/00

CPC分类号： B82Y10/00 ,  G06N99/002

摘要： Structures and methods allow: transfer of quantum information represented using the states of light (160) to a representation using the states of matter systems (120); transfer of quantum information represented by the states of matter systems (120) to a representation using the states of light (134); and error resistant encoding of quantum information using entangled states of matter and light to minimize errors.

公开(公告)号：EP2449717A1

公开(公告)日：2012-05-09

申请号：EP09748293.9

申请日：2009-10-26

申请人： Hewlett-Packard Development Company, L.P. ,  National Institute of Informatics

发明人： HARRISON, Keith Alexander ,  MUNRO, William ,  NEMOTO, Kae

IPC分类号： H04L9/08 ,  G09C1/00 ,  G06N99/00

CPC分类号： G06N99/002 ,  B82Y10/00 ,  H04L9/0855

摘要： A method is provided of creating an end-to-end entanglement (89) between qubits in first and second end nodes (81L, 81R) of a chain of optically-coupled nodes whose intermediate nodes (80) are quantum repeaters. Local entanglements (85) are created between qubits in neighbouring pairs in the chain through interaction of the qubits with light fields transmitted between the nodes. A trigger (82) propagated along the chain from one end node (81L), sequentially enables each quantum repeater (100; 210) to effect a top-level cycle of operation. In each such cycle, a repeater (80) initiates a merging of two entanglements involving respective repeater qubits that are at least expected to be entangled with qubits in nodes disposed in opposite directions along the chain from the repeater. A quantum repeater (80) adapted for implementing this method is also provided.

公开(公告)号：EP1805697A2

公开(公告)日：2007-07-11

申请号：EP05786324.3

申请日：2005-06-28

申请人： Hewlett-Packard Development Company, L.P.

发明人： MUNRO, William J., Hewlett-Packard Laboratories ,  SPILLER, Timothy P., Hewlett-Packard Laboratories ,  NEMOTO, Kae

IPC分类号： G06N1/00

CPC分类号： G06N99/002 ,  B82Y10/00

摘要： Nonlinear elements (200) can efficiently implement quantum information processing systems such as controlled phase shifters (400), non-absorbing detectors including parity detectors (1290), quantum subspace projections (600), non-absorbing Bell state analyzers (800), non-absorbing encoders/entanglers (1200), and fundamental quantum gates such as CNOT gates (1300). The non-absorbing detectors (1640, 1650) permit improvements in the efficiency of a probabilistic quantum gate (1720) by permitting reuse of the same photonic resources during multiple passes through the probabilistic gate (1720).

公开(公告)号：EP1756762A2

公开(公告)日：2007-02-28

申请号：EP05743382.3

申请日：2005-04-28

申请人： Hewlett-Packard Development Company, L.P.

发明人： BEAUSOLEIL, Raymond, G. ,  MUNRO, William J. ,  SPILLER, Timothy P. ,  NEMOTO, Kae

IPC分类号： G06N1/00

CPC分类号： G06N99/002 ,  B82Y10/00

摘要： Systems and methods convert or transfer quantum information from one photonic representation or state to another. This permits conversion of quantum information from one encoding to another and to representations that are convenient, efficient, or required for desired manipulations.

摘要翻译： 系统和方法将量子信息从一个光子表示或状态转换或传输到另一个。 这允许将量子信息从一种编码转换成另一种编码，并且可以方便，有效地或为了期望的操作而需要的表示。

公开(公告)号：EP1668573A2

公开(公告)日：2006-06-14

申请号：EP04789267.4

申请日：2004-09-28

申请人： Hewlett-Packard Development Company, L.P.

发明人： BEAUSOLEIL, Raymond G. ,  MUNRO, William J. ,  SPILLER, Timothy P. ,  NEMOTO, Kae ,  BARRETT, Sean D.

IPC分类号： G06N1/00

CPC分类号： G06N99/002 ,  B82Y10/00

摘要： A device capable of efficiently detecting a single-photon signal includes a matter system (112), sources (114 and 610) of a first beam and a second beam, and a measurement (420) system. The matter system (112) 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 (112), 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 (112). The measurement system (420) measures a change in the first or second beam to detect the absence, the presence, or the number of the photons in the signal.