WO1996012305A1 - Squid with a superconductive loop and resonator - Google Patents
Squid with a superconductive loop and resonator Download PDFInfo
- Publication number
- WO1996012305A1 WO1996012305A1 PCT/DE1995/001397 DE9501397W WO9612305A1 WO 1996012305 A1 WO1996012305 A1 WO 1996012305A1 DE 9501397 W DE9501397 W DE 9501397W WO 9612305 A1 WO9612305 A1 WO 9612305A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resonator
- squid
- substrate
- superconducting
- loop
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
- G01R33/0354—SQUIDS
- G01R33/0358—SQUIDS coupling the flux to the SQUID
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/10—Junction-based devices
- H10N60/12—Josephson-effect devices
- H10N60/124—Josephson-effect devices comprising high-Tc ceramic materials
Definitions
- the invention relates to a super-quantum interference detector (SQUID) with a superconducting loop formed on one side of a substrate and containing a Josephson contact and a superconducting resonator which is provided for coupling to SQUID signals of the loop.
- SQUID super-quantum interference detector
- (Front) side of a substrate is formed a superconducting layer and is laterally structured in the form of a loop with a microbridge as a Josephson contact.
- the SQUID loop is designed in such a way that, as a flow-focusing element, it simultaneously effects the focusing of a magnetic flux into the loop opening.
- a superconducting resonator is provided on the front of the substrate, which is coupled to the SQUID loop.
- the resonator is designed as a resonator, even if, for example, from M. Strupp et al. , Contribution to the Workshop on HTS Josephson Junctions and 3-Terminal Devices, University of Twente, The
- a SQUID with an S-shaped - ⁇ / 2 resonator is known.
- the resonator is manufactured in a microstrip configuration.
- Such a SQUID with ⁇ / 2 resonator does have a relatively high energy resolution with relatively low noise.
- the moderate is a disadvantage
- Resonator quality in the order of up to about 3,000 at 77 K.
- the SQUIDs with ⁇ / 2 resonator show only relatively small flux focussing elements on the resonator SQUID loop side of the substrate for space reasons, so that the field resolution is very low .
- the washer SQUID as the base plate of a superconducting stripline resonator, which consists of three superconducting layers which are arranged one above the other and each separated by a substrate acting as a dielectric.
- the middle superconducting layer is structured in the form of the resonator part.
- the resonator part can optionally contain coupling lines.
- the SQUID is positioned laterally at a location where the high-frequency current flows.
- Q L is the loaded quality of the resonator. Since this can be very large in the present case, k can be chosen to be small.
- the coupling k is the same as the HF current in the SQUID loop range.
- a setting of k can thus be achieved on the one hand by lateral displacement of the SQUID relative to the resonator.
- the change in k can also be set in a targeted manner by varying the distance between the SQUID and the resonator.
- the third superconducting layer on the back of the second substrate is laterally structured in such a way that it matches the structuring of the SQUID loop structure on the front of the first
- FIGS. 2a-c shows a schematic cross section through the SQUID according to the invention in the A-A plane indicated in FIGS. 2a-c,
- FIG. 2a Schematic representation of the lateral
- FIG. 2b shows a schematic representation of the lateral geometry of the U-shaped resonator on the second substrate
- FIG. 2c shows a schematic representation of the lateral geometry of the third, superconducting layer on the back of the second substrate.
- LaA103 substrate 1 shows a SQUID according to the invention in cross section through the AA plane shown in FIGS. 2a to 2c.
- a former LaA103 substrate 1 has a superconducting YBa2Cu3 ⁇ 7 layer, which is laterally suitably structured to form the SQUID function (FIG. 2a).
- a second LaAlC> substrate 3 has a lateral, U-shaped, superconducting YBa2C -3 ⁇ 7 layer on one side to form the resonator 4 (FIG. 2b).
- the substrate 3 has a further, superconducting YBa2Cu3 ⁇ 7 layer on the back, the lateral geometry of which is shown in FIG. 2c.
- the substrate 3 is positioned relative to the substrate 1 so that as a result three superconducting YBa2Cu3 ⁇ 7 layers arranged in parallel, each separated from one another by dielectric LaAl0 3 1 and 2, are formed.
- FIGS. 2a to 2c The lateral geometries of the three superconducting layers 2, 4, 5 are shown schematically in FIGS. 2a to 2c.
- the lateral structuring of the superconducting layer 2 has a guader-shaped layer area, in the middle of which there is a SQUID loop opening 6 of 50 * 50 ⁇ irr and also a superconducting microbridge as a Josephson contact 7 and a slit-shaped opening 8 - in order to maximize the flow-focusing Effect of layer 2 - are included.
- 2b shows the superconducting, planar resonator 4 relative to the cuboid configuration of the superconducting layer 2 or 5 as a U-shaped structured superconducting layer 4.
- FIG. 2c shows the lateral geometry of the superconducting layer 5. It corresponds to the superconducting micro bridge as Josephson contact 7 of the lateral geometry of the SQUID-forming layer 2, except for the superconducting micro bridge.
- the corresponding loop opening 6 in the layer 5 is not the same size, but actually - to increase the flow-focusing effect of the layer 5 - too
- the SQUID shown in FIGS. 1, 2a to 2c with a U-shaped resonator has a modular structure, so that this gives the possibility of exchanging the resonator 4 with substrate 3 and layer 5 for the system of substrate 1 and layer 2.
- the quality (quality) of the resonator can be determined simply by using a superconducting film as the end plate instead of SQUIDs 1, 2.
- the modular structure allows system 4, 3 and 5 as a test system for washer SQUIDs 1 and 2 with various parameters such as to use the SQUID inductor ß ⁇ .
- a procedural approach e.g. find the optimal operating mode of a selected washer SQUID.
- the present SQUID resonator system can also be used with readout electronics via two-port coupling, as described, for example, by M. Heinz et al., Contribution to the Workshop on HTS Josephson Junction and 3-Terminal Devices, University of Twente, The Netherlands, 2-4 May 1994 is known to be operated.
- the SQUID according to the invention can be operated both in the RF range and at low frequencies with conventional readout electronics for RF washer SQUIDs.
- U-shaped resonators for example S-shaped, ⁇ ⁇ or-/ 2 resonators can also be used in the SQUID according to the invention.
- metallized isolators can be used as terminations of the resonator base plates, which meet the above-mentioned condition due to the frequency dependence of the skin depth.
- substrate thicknesses of 0.5 mm and layer thicknesses for the superconducting layers 2, 4 and 5 of 200 nm YBa2Cu3 ⁇ 7 were selected.
- the two ends of the U-shaped resonator were about 5 mm apart, the dimensions of the cuboid layers 2 and 5 were 8 * 8 mm.
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8512839A JPH10507314A (en) | 1994-10-13 | 1995-10-07 | SQUID with superconducting loop and resonator |
EP95934050A EP0787361A1 (en) | 1994-10-13 | 1995-10-07 | Squid with a superconductive loop and resonator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4436448.2 | 1994-10-13 | ||
DE4436448A DE4436448C1 (en) | 1994-10-13 | 1994-10-13 | SQUID with increased energy resolution |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996012305A1 true WO1996012305A1 (en) | 1996-04-25 |
Family
ID=6530582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1995/001397 WO1996012305A1 (en) | 1994-10-13 | 1995-10-07 | Squid with a superconductive loop and resonator |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0787361A1 (en) |
JP (1) | JPH10507314A (en) |
DE (1) | DE4436448C1 (en) |
WO (1) | WO1996012305A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003090161A2 (en) * | 2002-04-15 | 2003-10-30 | D-Wave Systems, Inc. | Extra-substrate control system |
US11790259B2 (en) | 2019-09-06 | 2023-10-17 | D-Wave Systems Inc. | Systems and methods for tuning capacitance in quantum devices |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997036186A2 (en) * | 1996-03-26 | 1997-10-02 | Forschungszentrum Jülich GmbH | Arrangement for coupling an rf-squid magnetometer to a superconductive tank circuit |
DE10063735C1 (en) * | 2000-12-18 | 2002-04-18 | Inst Physikalische Hochtech Ev | Superconducting quantum interference detector sensor has several trimming structures in form of removable protrusions formed on arms forming SQUID hole |
DE10111619C1 (en) * | 2001-03-10 | 2002-07-11 | Forschungszentrum Juelich Gmbh | Coupling arrangement for rf-SQUID magnetometer has resonator within space enclosed by rf-SQUID |
US8841764B2 (en) * | 2012-01-31 | 2014-09-23 | International Business Machines Corporation | Superconducting quantum circuit having a resonant cavity thermalized with metal components |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4064029A (en) * | 1977-02-08 | 1977-12-20 | The United States Of America As Represented By The United States Energy Research And Development Administration | Method of making an improved superconducting quantum interference device |
WO1990000742A1 (en) * | 1988-07-11 | 1990-01-25 | UNITED STATES GOVERNMENT, as represented by THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION OFFICE OF ASSOCIATE GENERAL COUNSEL (INTELLECTUAL PRO PERTY) | Planar thin film squid with integral flux concentrator |
DE4319693A1 (en) * | 1993-06-16 | 1994-12-22 | Forschungszentrum Juelich Gmbh | RF-SQUID with an integrated lambda microwave resonator as a highly sensitive magnetometer |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8911237U1 (en) * | 1989-09-21 | 1989-11-02 | Kernforschungsanlage Juelich Gmbh, 5170 Juelich, De |
-
1994
- 1994-10-13 DE DE4436448A patent/DE4436448C1/en not_active Expired - Fee Related
-
1995
- 1995-10-07 EP EP95934050A patent/EP0787361A1/en not_active Withdrawn
- 1995-10-07 WO PCT/DE1995/001397 patent/WO1996012305A1/en not_active Application Discontinuation
- 1995-10-07 JP JP8512839A patent/JPH10507314A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4064029A (en) * | 1977-02-08 | 1977-12-20 | The United States Of America As Represented By The United States Energy Research And Development Administration | Method of making an improved superconducting quantum interference device |
WO1990000742A1 (en) * | 1988-07-11 | 1990-01-25 | UNITED STATES GOVERNMENT, as represented by THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION OFFICE OF ASSOCIATE GENERAL COUNSEL (INTELLECTUAL PRO PERTY) | Planar thin film squid with integral flux concentrator |
DE4319693A1 (en) * | 1993-06-16 | 1994-12-22 | Forschungszentrum Juelich Gmbh | RF-SQUID with an integrated lambda microwave resonator as a highly sensitive magnetometer |
Non-Patent Citations (1)
Title |
---|
TANAKA S ET AL: "Properties of YBa/sub 2/Cu/sub 3/O/sub 7-y/ large washer SQUID", JAPANESE JOURNAL OF APPLIED PHYSICS, PART 2 (LETTERS), 1 MAY 1993, JAPAN, vol. 32, no. 5A, ISSN 0021-4922, pages L662 - L664 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003090161A2 (en) * | 2002-04-15 | 2003-10-30 | D-Wave Systems, Inc. | Extra-substrate control system |
WO2003090161A3 (en) * | 2002-04-15 | 2005-02-17 | Dwave Sys Inc | Extra-substrate control system |
US6911664B2 (en) | 2002-04-15 | 2005-06-28 | D-Wave Systems, Inc. | Extra-substrate control system |
US7042005B2 (en) | 2002-04-15 | 2006-05-09 | D-Wave Systems, Inc. | Extra-substrate control system |
US11790259B2 (en) | 2019-09-06 | 2023-10-17 | D-Wave Systems Inc. | Systems and methods for tuning capacitance in quantum devices |
Also Published As
Publication number | Publication date |
---|---|
DE4436448C1 (en) | 1996-02-29 |
JPH10507314A (en) | 1998-07-14 |
EP0787361A1 (en) | 1997-08-06 |
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