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1. 发明授权

US06580102B2 Four-terminal system for reading the state of a phase qubit 有权
公开(公告)号：US06580102B2
公开(公告)日：2003-06-17
申请号：US09875776
申请日：2001-06-05
申请人： Zdravko Ivanov , Alexander Tzalentchuk , Jeremy P. Hilton , Alexander Maassen van den Brink
发明人： Zdravko Ivanov , Alexander Tzalentchuk , Jeremy P. Hilton , Alexander Maassen van den Brink
IPC分类号： H01L31072
CPC分类号： G06N99/002 , B82Y10/00 , H01L39/225 , Y10S977/70 , Y10S977/812 , Y10S977/838 , Y10S977/933 , Y10S977/96
摘要： Quantum computing systems and methods that use opposite magnetic moment states read the state of a qubit by applying current through the qubit and measuring a Hall effect voltage across the width of the current. For reading, the qubit is grounded to freeze the magnetic moment state, and the applied current is limited to pulses incapable of flipping the magnetic moment. Measurement of the Hall effect voltage can be achieved with an electrode system that is capacitively coupled to the qubit. An insulator or tunnel barrier isolates the electrode system from the qubit during quantum computing. The electrode system can include a pair of electrodes for each qubit. A readout control system uses a voltmeter or other measurement device that connects to the electrode system, a current source, and grounding circuits. For a multi-qubit system, selection logic can select which qubit or qubits are read.

2. 发明授权

US06791109B2 Finger SQUID qubit device 有权
公开(公告)号：US06791109B2
公开(公告)日：2004-09-14
申请号：US10025818
申请日：2001-12-18
申请人： Alexander Tzalenchuk , Zdravko Ivanov , Jeremy P. Hilton
发明人： Alexander Tzalenchuk , Zdravko Ivanov , Jeremy P. Hilton
IPC分类号： H01L2906
CPC分类号： G06N99/002 , B82Y10/00 , H01L27/18 , Y10S977/933
摘要： A finger SQUID qubit device and method for performing quantum computation with said device is disclosed. A finger SQUID qubit device includes a superconducting loop and one or more superconducting fingers, wherein the fingers extend to the interior of said loop. Each finger has a mesoscopic island at the tip, separated from the rest of the finger by a Josephson junction. A system for performing quantum computation with the finger SQUID qubit device includes a mechanism for initializing, entangling, and reading out the qubits. The mechanism may involve passing a bias current across the leads of the superconducting loop and a mechanism for measuring a potential change across the leads of the superconducting loop. Furthermore, a control system includes a mechanism for addressing specific qubits in a quantum register of finger SQUID devices.

3. 发明授权

US06614047B2 Finger squid qubit device 有权
公开(公告)号：US06614047B2
公开(公告)日：2003-09-02
申请号：US10025848
申请日：2001-12-17
申请人： Alexander Tzalenchuk , Zdravko Ivanov , Jeremy P. Hilton
发明人： Alexander Tzalenchuk , Zdravko Ivanov , Jeremy P. Hilton
IPC分类号： H01L2900
CPC分类号： G06N99/002 , B82Y10/00 , H01L27/18 , Y10S977/933
摘要： A finger SQUID qubit device and method for performing quantum computation with said device is disclosed. A finger SQUID qubit device includes a superconducting loop and one or more superconducting fingers, wherein the fingers extend to the interior of said loop. Each finger has a mesoscopic island at the tip, separated from the rest of the finger by a Josephson junction. A system for performing quantum computation with the finger SQUID qubit device includes a mechanism for initializing, entangling, and reading out the qubits. The mechanism may involve passing a bias current across the leads of the superconducting loop and a mechanism for measuring a potential change across the leads of the superconducting loop. Furthermore, a control system includes a mechanism for addressing specific qubits in a quantum register of finger SQUID devices.

4. 发明授权

US06576951B2 Four-terminal system for reading the state of a phase qubit 有权
公开(公告)号：US06576951B2
公开(公告)日：2003-06-10
申请号：US10194704
申请日：2002-07-12
申请人： Zdravko Ivanov , Alexander Tzalentchuk , Jeremy P. Hilton , Alexander Maassen van den Brink
发明人： Zdravko Ivanov , Alexander Tzalentchuk , Jeremy P. Hilton , Alexander Maassen van den Brink
IPC分类号： H01L29788
CPC分类号： G06N99/002 , B82Y10/00 , H01L39/225 , Y10S977/70 , Y10S977/812 , Y10S977/838 , Y10S977/933 , Y10S977/96
摘要： Quantum computing systems and methods that use opposite magnetic moment states read the state of a qubit by applying current through the qubit and measuring a Hall effect voltage across the width of the current. For reading, the qubit is grounded to freeze the magnetic moment state, and the applied current is limited to pulses incapable of flipping the magnetic moment. Measurement of the Hall effect voltage can be achieved with an electrode system that is capacitively coupled to the qubit. An insulator or tunnel barrier isolates the electrode system from the qubit during quantum computing. The electrode system can include a pair of electrodes for each qubit. A readout control system uses a voltmeter or other measurement device that connects to the electrode system, a current source, and grounding circuits. For a multi-qubit system, selection logic can select which qubit or qubits are read.

5. 发明授权

US06573202B2 Four-terminal system for reading the state of a phase qubit 有权
公开(公告)号：US06573202B2
公开(公告)日：2003-06-03
申请号：US10155746
申请日：2002-05-24
申请人： Zdravko Ivanov , Alexander Tzalentchuk , Jeremy P. Hilton , Alexander Maassen van den Brink
发明人： Zdravko Ivanov , Alexander Tzalentchuk , Jeremy P. Hilton , Alexander Maassen van den Brink
IPC分类号： H01L2100
CPC分类号： G06N99/002 , B82Y10/00 , H01L39/225 , Y10S977/70 , Y10S977/812 , Y10S977/838 , Y10S977/933 , Y10S977/96
摘要： Quantum computing systems and methods that use opposite magnetic moment states read the state of a qubit by applying current through the qubit and measuring a Hall effect voltage across the width of the current. For reading, the qubit is grounded to freeze the magnetic moment state, and the applied current is limited to pulses incapable of flipping the magnetic moment. Measurement of the Hall effect voltage can be achieved with an electrode system that is capacitively coupled to the qubit. An insulator or tunnel barrier isolates the electrode system from the qubit during quantum computing. The electrode system can include a pair of electrodes for each qubit. A readout control system uses a voltmeter or other measurement device that connects to the electrode system, a current source, and grounding circuits. For a multi-qubit system, selection logic can select which qubit or qubits are read.

6. 发明授权

US06433375B1 Tunable microwave devices 有权
标题翻译：可调微波设备
公开(公告)号：US06433375B1
公开(公告)日：2002-08-13
申请号：US09548161
申请日：2000-04-13
申请人： Erik Carlsson , Peter Peirov , Orest Vendik , Erland Wikborg , Zdravko Ivanov
发明人： Erik Carlsson , Peter Peirov , Orest Vendik , Erland Wikborg , Zdravko Ivanov
IPC分类号： H01L2976
CPC分类号： H01P7/082 , H01P1/181 , H01P7/088
摘要： An electrically tunable device, particularly for microwaves, includes a carrier substrate, conductors, and at least one tunable ferroelectric layer. Between the conductors and the tunable ferroelectric layer, a buffer layer including a thin film structure having a non-ferroelectric material is arranged.
摘要翻译：特别是用于微波的电可调谐装置包括载体衬底，导体和至少一个可调谐铁电层。在导体与可调铁电体层之间设置有具有非铁电材料的薄膜结构的缓冲层。

7. 发明授权

US5831279A Device and method providing weak links in a superconducting film and device comprising weak links 失效
标题翻译：在超导薄膜中提供薄弱环节的装置和方法以及包括薄弱环节的装置
公开(公告)号：US5831279A
公开(公告)日：1998-11-03
申请号：US434194
申请日：1995-05-03
申请人： Erland Wikborg , Evgeni Stepantsov , Zdravko Ivanov , Tord Claeson
发明人： Erland Wikborg , Evgeni Stepantsov , Zdravko Ivanov , Tord Claeson
IPC分类号： H01L39/22 , H01L39/24 , H01L29/06 , H01B12/00 , H01L31/0256
CPC分类号： H01L39/225
摘要： A device with weak links (Josephson junctions) in a superconducting film has two single crystals connected through an interconnecting arrangement that may have one or more sublayers. At least two grain boundaries or at least one barrier are/is formed in the substrate.
摘要翻译：在超导膜中具有弱连接（约瑟夫逊结）的器件具有通过可能具有一个或多个子层的互连布置连接的两个单晶。在基板中形成至少两个晶界或至少一个势垒。

8. 发明授权

US06563153B2 Electrically tunable device and a method relating thereto 有权
标题翻译：电可调谐装置及其相关方法
公开(公告)号：US06563153B2
公开(公告)日：2003-05-13
申请号：US09885520
申请日：2001-06-20
申请人： Erland Wikborg , Zdravko Ivanov , Peter Petrov , Spartak Gevorgian
发明人： Erland Wikborg , Zdravko Ivanov , Peter Petrov , Spartak Gevorgian
IPC分类号： H01L2976
CPC分类号： H01L29/93
摘要： A thin film ferroelectric varactor device comprising a substrate layer, a ferroelectric layer structure and an electrode structure is presented. The ferroelectric layer structure comprises a number of ferroelectric layers and a number of intermediate buffer layers arranged in an alternating manner. At least a first and a second layer of the ferroelectric layers have different Curie temperatures, i.e. the dielectric constant of the first ferroelectric layer has a maximum at a temperature which is different from the temperature at which the dielectric constant of the second ferroelectric layer has a maximum.
摘要翻译：提出了一种包括基底层，铁电层结构和电极结构的薄膜铁电变容二极管器件。铁电层结构包括多个铁电层和以交替方式布置的多个中间缓冲层。至少第一层和第二层铁电层具有不同的居里温度，即第一铁电层的介电常数在不同于第二铁电层的介电常数为最大值。

9. 发明授权

US06812484B2 Finger squid qubit device 有权
标题翻译：手指鱿鱼量子位设备
公开(公告)号：US06812484B2
公开(公告)日：2004-11-02
申请号：US10351631
申请日：2003-01-23
申请人： Alexander Tzalenchuk , Zdravko Ivanov , Jeremy P. Hilton
发明人： Alexander Tzalenchuk , Zdravko Ivanov , Jeremy P. Hilton
IPC分类号： H01L2900
CPC分类号： G06N99/002 , B82Y10/00 , H01L27/18 , Y10S977/933
摘要： A finger SQUID qubit device and method for performing quantum computation with said device is disclosed. A finger SQUID qubit device includes a superconducting loop and one or more superconducting fingers, wherein the fingers extend to the interior of said loop. Each finger has a mesoscopic island at the tip, separated from the rest of the finger by a Josephson junction. A system for performing quantum computation with the finger SQUID qubit device includes a mechanism for initializing, entangling, and reading out the qubits. The mechanism may involve passing a bias current across the leads of the superconducting loop and a mechanism for measuring a potential change across the leads of the superconducting loop. Furthermore, a control system includes a mechanism for addressing specific qubits in a quantum register of finger SQUID devices.
摘要翻译：公开了一种用于与所述设备执行量子计算的手指SQUID量子比特装置和方法。手指SQUID量子比特装置包括超导环和一个或多个超导指，其中手指延伸到所述环的内部。每个手指在尖端具有一个介观岛，通过约瑟夫逊结与手指的其余部分分开。用于使用手指SQUID量子位装置进行量子计算的系统包括用于初始化，纠缠和读出量子位的机构。该机理可以包括使超导回路的引线上的偏置电流通过，以及用于测量跨越超导环路的引线的电位变化的机构。此外，控制系统包括用于寻址手指SQUID设备的量子寄存器中的特定量子位的机制。

10. 发明授权

US06479139B1 Superconducting substrate structure and a method of producing such structure 失效
标题翻译：超导基板结构及其制造方法
公开(公告)号：US06479139B1
公开(公告)日：2002-11-12
申请号：US09718668
申请日：2000-11-22
申请人： Tord Claeson , Zdravko Ivanov , Erland Wikborg
发明人： Tord Claeson , Zdravko Ivanov , Erland Wikborg
IPC分类号： B32B702
CPC分类号： H01L39/143 , H01L39/2454 , Y10T428/24975
摘要： A superconducting substrate structure with a high temperature superconducting (HTS) ground plane, for epitaxial growth of multilayers thereon is provided. The substrate structure includes a composite substrate structure with a first and a second substrate layer each covered by an HTS film, which HTS films are bonded together through annealing to form a buried superconducting layer wherein one of the substrate layers is polished to form a smooth insulating layer adjacent to an HTS layer. A method of producing a superconducting substrate structure is provided including the steps of arranging two substrate layers on which HTS films are provided such that the HTS films come in close contact to one another, applying a high pressure in an oxygen atmosphere and at an elevated temperature such that the HTS films are annealed and bonded together, and subsequently polishing one of the substrate layers to form a smooth insulator.
摘要翻译：提供了一种具有高温超导（HTS）接地层的超导衬底结构，用于在其上多层的外延生长。衬底结构包括具有由HTS膜覆盖的第一和第二衬底层的复合衬底结构，该HTS膜通过退火结合在一起以形成掩埋超导层，其中一个衬底层被抛光以形成平滑绝缘层与HTS层相邻。提供一种制造超导衬底结构的方法，包括以下步骤：在其上设置两个衬底层，其上设置有HTS膜，使得HTS膜彼此紧密接触，在氧气氛中和高温下施加高压使得HTS膜退火并结合在一起，并且随后抛光一个衬底层以形成平滑的绝缘体。

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