CN2638073Y - High temp superconducting radio-frequency quantum interference device system - Google Patents
High temp superconducting radio-frequency quantum interference device system Download PDFInfo
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- CN2638073Y CN2638073Y CN 03275753 CN03275753U CN2638073Y CN 2638073 Y CN2638073 Y CN 2638073Y CN 03275753 CN03275753 CN 03275753 CN 03275753 U CN03275753 U CN 03275753U CN 2638073 Y CN2638073 Y CN 2638073Y
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Abstract
The utility model provides a high temperature superconducting rf quantum interferometer system whose working frequency can be higher, containing a probe and an rf working circuit. The probe is connected with the rf working circuit by an rf line. The probe comprises a superconducting film hollow coplanar resonator composed of three unclosed loop lines, a superconducting film flux concentrator separated from the superconducting film hollow coplanar resonator, an SQUID component and a microwave coupling loop. The SQUID component is arranged above the flux concentrator and the hollow coplanar resonator is arranged above the SQUID component and between the SQUID component and the microwave coupling loop. By further designing the size of the hollow coplanar resonator in the probe, the probe can work between 1.23-1.42 GHz, therefore, the high temperature superconducting rf quantum interferometer system can work in the frequency scope, thereby avoiding mobile phone interference scope.
Description
Technical field:
The utility model belongs to Weak magentic-field measurement mechanism technical field, relates in particular to high-temperature superconductor rf squid (HTc rf SQUID) system.
Background technology:
Present superconducting quantum interference device (SQUID) (SQUID) is the sensitiveest detector for magnetic field known to the mankind, because its high magnetic field sensitivity, thereby be used to detect extremely faint field signal, have a wide range of applications at aspects such as magnetocardiogram measurement, magnetic survey, Non-Destructive Testing and magnetic microscopes.Also be the high sensitivity owing to it, the SQUID magnetometer generally can only use at screened room or the little field of the quiet electromagnetic interference (EMI) of environment.The existing HTc rf SQUID that is operated in the 800MHz frequency range is invented by Germany, the magnetic flux noise of this 800MHz HTc rfSQUID is lower, owing to adopted superconduction coplanar resonator with magnetic focusing device effect, make the useful area of probe bigger, thereby make system that higher magnetic field sensitivity be arranged.This high-performance HTc rfSQUID is operated in the 800MHz wave band, but working range is that 600MHz is to 1GHz.Yet because this frequency range the most intensive frequency range of China's mobile communication just, the mobile communication signal has great interference to HTc rf SQUID system, not only brings huge noise, and can make system's losing lock and can't operate as normal.Therefore, for helping applying of HTc rf SQUID, further improve the frequency of operation of HTc rf SQUID, it is necessary making it avoid the mobile communication frequency range.
The utility model content:
The purpose of this utility model provides the superconducting quantum interference device (SQUID) system that a kind of frequency of operation can be higher, and the raising of its frequency of operation mainly is to realize by the improvement to sonde configuration.
The technical solution of the utility model is as follows:
The high temperature superconducting quantum interfering instrument system comprises probe, radio frequency operation circuit, and probe is connected with the radio frequency operation circuit by a radio frequency line.Described probe comprises: the hollow coplanar resonator of superconducting thin film that is made of three inc loop wires, the superconducting thin film flux concentrator, SQUID device, the microwave coupling ring that are separated with this hollow coplanar resonator, the SQUID device is positioned at flux concentrator top, and hollow coplanar resonator is above the SQUID device and be between SQUID device and the microwave coupling ring.
Described high-temperature superconductor rf squid system, hollow coplanar resonator in its sonde configuration and the distance between the SQUID device can be regulated by adding certain thickness pad, to change the coupling coefficient between SQUID device and the resonator loop.
The frequency range criteria for classifying according to national radio administration formulates has one section space between 1.2276GHz to 1.427GHz.Further design the size of the hollow coplanar resonator in the described sonde configuration, this probe can be operated between 1.23～1.42GHz frequency range, centre frequency is about 1.3GHz, bandwidth is 190MHz, thereby make described high-temperature superconductor rf squid system can be operated in this band limits, concrete scheme is as follows: described hollow coplanar resonator is produced on 10 * 10mm
2Substrate on; Described three not the width of closed loop wire be 200 μ m, wire spacing is 100 μ m, the length of side of middle loop wire or diameter are 4.4mm; Opening length on described three not closed loop wires is 50 μ m, and outer shroud becomes 180 ° of angles with middle ring opening part.Described substrate is LaAlO
3Substrate or SrTiO
3Substrate.Its corresponding radio frequency operation circuit working is between 1.2276GHz to 1.427GHz frequency range, and centre frequency is 1.3GHz.
HTc rf SQUID of the present utility model system, what its probe adopted is the superconducting thin film coplanar resonator and this new structure of large tracts of land magnetic focusing device of no flux concentrator, working properly through debug system, system can stably show triangular wave during open loop, can normally lock during closed loop.The inventor tests HTc rf SQUID system, and has measured the noise spectrum curve of system with HP 35665A dynamic signal analyzer, and measurement is carried out in the mu-metal shielding cylinder, measurement result as shown in Figure 4, its white noise is S as can be seen
Φ 1/2=2.8 * 10
-5Φ
0/ √ Hz.The inventor calibrates the magnetic field flux conversion coefficient of this system, has added the LaAlO of 2mm between resonator and SQUID device
3Under the situation of pad, measure magnetic field flux conversion coefficient B/ φ=1.52nT/ Φ
0, useful area A
Eff=1.35mm
2Can get the magnetic field sensitivity S of system thus
B 1/2=43fT/ √ Hz (white noise sound area).The result shows the novelty design of the rfSQUID circuit of successfully having finished a new frequency range and makes.
Advantage of the present utility model and good effect: according to the principle of work of HTc rf SQUID and noise theory as can be known, improve frequency of operation and help reducing the magnetic flux noise.HTc rf SQUID of the present utility model system can be operated in 1.23GHz to 1.42GHz, and centre frequency is about 1.3GHz approximately, bandwidth 190MHz.This is greater than 1GHz, less than a bit of idle frequency range in the close-packed frequency range of 2GHz, has avoided the mobile phone interference band.
Description of drawings:
Fig. 1 is the circuit structure block diagram of the utility model system.Among the figure:
The 1-probe, 2-radio frequency operation circuit, 3-adjusts box, 4-signal generator, 5-dual trace oscilloscope
Fig. 2 (a) is the sonde configuration synoptic diagram in the utility model system.Among the figure:
21,24, the 27-substrate, 22,23, the 26-superconducting thin film, 25-microwave coupling ring, 28-pad
21 and the 22 common superconducting thin film flux concentrators of forming
23 and the 24 common SQUID devices of forming
26 and the 27 common hollow coplanar resonators of superconducting thin film of forming
Fig. 2 (b) is the coplanar resonator structural representation in the sonde configuration.
Fig. 2 (c) is the flux concentrator structural representation in the sonde configuration.
Fig. 3 (a) is the structured flowchart of the radio frequency operation circuit in the utility model system.
Fig. 3 (b) is the directional coupler circuit diagram in the radio frequency operation circuit
Fig. 3 (c) is the preamplifier circuit figure in the radio frequency operation circuit
Fig. 3 (d) is the voltage-controlled oscillator circuit figure in the radio frequency operation circuit
Fig. 3 (e) is the mixer figure in the radio frequency operation circuit
Fig. 3 (f) is the attenuator circuit figure in the radio frequency operation circuit
Fig. 3 (g) is backfeed loop and the low-frequency amplifier circuit figure in the radio frequency operation circuit
Fig. 4 is the magnetic flux noise spectrum curve of the utility model system.
Embodiment:
Following partial content provides one of the present utility model can be operated in 1.23GHz～1.42GHz, and centre frequency is the HTc rf SQUID system example of 1.3GHz.
As shown in Figure 1, HTc rf SQUID system comprises probe 1, radio frequency operation circuit 2, adjusts box 3, signal generator 4, dual trace oscilloscope 5.Probe 1 adopts three layers of new structure shown in Fig. 2 (a), is placed in the liquid nitrogen of Dewar flask, and liquid nitrogen temperature is about 77K.Probe 1 has the radio frequency line of SMA connector to be connected on the SMA socket of radio frequency operation circuit 2 by one one termination; The other end of radio frequency operation circuit 2 is equipped with one 15 needle socket, radio frequency operation circuit 2 links to each other with 15 needle sockets of adjusting box 3 by one the 15 pin cable that is connected with this 15 pin plug, adjusting has 14 road signals by 15 pin line input radio frequency operating circuits 2 in the box 3, they are: VCO (output frequency), ATT (output attenuatoin), VDO (DC level), LOCK/FREE (locking/open circuit), RESET (resetting), DCFLUX (direct current flux amount), MOD0 (signal generator input 0), MOD1 (signal generator input 1), + VCC (+12V),-VCC is (12V) with four " ground connection " end, three tunnel DC voltage VCO wherein, the ATT range of adjustment is 0 to 12 volt, and the VDC range of adjustment is-10 volts to+10 volts.Radio frequency operation circuit 2 has one road signal SIGNAL (with by the relevant voltage output signal of measuring magnetic field) to output to adjustment box 3 by 15 pin lines in addition, sends into dual trace oscilloscope 5 then and shows.The triangular signal that signal generator 4 produces outputs on the Q9 plug (MOD0 or MOD1) of adjusting box 3, and by 15 pin line input radio frequency operating circuits 2, the triangle wave voltage of its generation is the needed field sweep voltage of superconducting quantum interference device (SQUID) then.
Adjusting on the front panel of box 3 has three multiturn potentiometers, can manual adjustments VCO, ATT, the numerical value of VDC, and to adjust the duty of SQUID.Adjusting on the box front panel has two mechanical switchs, and one is LOCK/FREE (locking/open circuit) single-pole double-throw switch (SPDT), and when it placed the FREE position, circuit was in open loop situations, and oscillograph shows triangular wave.But when it was in the LOCK lock-out state, oscillograph showed the straight line after the locking.Another switch is RESET (a resetting) keyswitch, can make the radio frequency operation circuit reset when pressing.
The principle of work of above-mentioned HTc rf SQUID system is: probe is used for surveying faint field signal, it is in the detected radio-frequency voltage signal input radio frequency operating circuit relevant with external magnetic field, the radio frequency operation circuit by amplification, detection, obtains the voltage signal relevant with external magnetic field again.Adjust box and produce radio frequency operation circuits needed three road adjustable dc voltages (VCO, ATT, VDC), adjust output frequency, decay and the DC level of superconducting quantum interference device (SQUID) respectively, this three tunnel DC voltage is when VCO, ATT, VDC get different numerical value, the superconducting quantum interference device (SQUID) output waveform is different, thereby changes the duty and the output waveform of superconducting quantum interference device (SQUID); Adjust " resetting " and " open circuit/locking " switch that box also produces control radio frequency operation state, and the required triangular wave field sweep signal of SQUID of signal generator output is defeated by the radio frequency operation circuit.
Below concrete probe and the radio frequency operation circuit structure introduced:
One, probe
Shown in Fig. 2 (a), probe is to be made of three-decker.Flux concentrator (21 and 22) is made by the bigger YBCO superconducting thin film of area, pastes mutually face-to-face with flux concentrator through the SQUID of =3.5mm device (23 and 24) outward.The hollow coplanar resonator of superconducting thin film (26 and 27) is placed on SQUID device top, middle at SQUID device and microwave coupling ring 25.Distance between hollow coplanar resonator of superconducting thin film and the SQUID device can be by adding certain thickness LaAlO
3 Pad 28 is regulated, to change the coupling coefficient κ between the SQUID device resonator loop.
As Fig. 2 (b) with (c), be respectively superconducting thin film 26 that constitutes hollow coplanar resonator and the superconducting thin film 22 that constitutes flux concentrator, be produced in LaAlO
3On the substrate 27 and 21.Film prepares with pulsed laser deposition, and thickness is about 300nm.Pattern adopts the standard photolithography process preparation, i.e. whirl coating, baking, exposure, development, photographic fixing forms with 2% phosphoric acid,diluted wet etching at last.
The resonance frequency of the hollow coplanar resonator of superconducting thin film is designed to the 1.3GHz frequency range, and the center ring linear dimension is 4.4mm, and it is produced on 10 * 10mm
2LaAlO
3On the substrate 27.Article three, the width of split ring is 200 μ m, and openings of sizes is 50 μ m, and wire spacing is 100 μ m, and outer shroud becomes ° angle, θ=180 with middle ring opening part.With reflectometry resonance frequency and Q-unloaded Q to this coplanar resonator on the HP8590L spectrometer
0Measure, record resonance frequency f
0About 1.24GHz, Q-unloaded Q
0About 1850.
The superconducting thin film flux concentrator is done at 15 * 15 * mm
2LaAlO
3On the substrate 21, in order to make full use of Substrate Area, superconducting thin film extends to edges of substrate always.The flux concentrator central hole size is 1.2 * 1.2mm
2, designed a square breach in the external port of cracking, before whole figure photoetching exposure,, connect to avoid manufacturing process Zhong Narrow to be sewn on end points herein in advance through the long period exposure.
Whole probe is pressed assembling shown in Fig. 2 (a), used SQUID device (23 and 24) external diameter =3.5mm, and endoporus is 10 * 500 μ m
2, be produced on 5 * 5mm
2SrTiO
3On the substrate 24, the Josephson on the device becomes the substrate level knot.Distance between the hollow coplanar resonator of microwave coupling ring and superconducting thin film can be regulated by the thickness of regulating pad 28, is used to regulate the resonator of rf SQUID device and the coupling coefficient between the microwave transmission line, changes the quality factor Q of carrying that has of probe with this
LRecord the resonance frequency f of probe with HP 8590L frequency spectrograph
0Be 1.27GHz, Δ f=5.3MHz, Q
LBe 240.
Two, radio frequency operation circuit
The circuit block diagram of radio frequency operation circuit is made of 8 parts such as directional coupler, radio frequency amplifier, RF Voltage-Controlled Oscillator (radio-frequency (RF) local oscillator), radio frequency attenuator, RF mixer, low-frequency amplifier, integrator and feedback circuits shown in Fig. 3 (a).The radio-frequency (RF) local oscillator signal produces the required radio-frequency bias electric current of SQUID by radio frequency attenuator, and the reverse feed-in rfSQUID of direction of passage coupling mechanism provides energy to SQUID, and rf SQUID promptly setovers.And SQUID is drawing the process of energy from the radio frequency operation circuit, also can pass external magnetic field signal to be measured back the radio frequency operation circuit, tested like this field signal with regard to the put-through channel of direction of passage coupling mechanism import into radio frequency amplifier carry out radio frequency amplify, again by after the RF mixer detection, obtain with by the relevant voltage signal of measuring magnetic field.The locked loop that low-frequency amplifier, integrator and feedback circuit constitute feeds back to rfSQUID with output signal and gets on, thereby produces compensating field in rf SQUID, constitutes magnetic flux locking-type rf SQUID, makes the linear relationship that is varied to of output voltage and outer magnetic flux.The circuit diagram of each several part is respectively shown in Fig. 3 (b)～Fig. 3 (g).
1. directional coupler (Coupler)
Directional coupler be can select side signal transmission to device.It has four ports usually, input port (Input), output port (Output), coupling port (Coupled) and Termination port.Be put-through channel between Input and Output, the loss when signal passes through is inserted loss (Mainline Loss) the main channel, is coupling channel between Coupled and Input, and the decay that signal passes through is represented with the degree of coupling (Coupling).
The JDC-20-5 that directional coupler in the present embodiment is produced for Mini-Circuits company, circuit diagram is shown in Fig. 3 (b).Its operating frequency range is 50-1500MHz.The Input end links to each other with SQUID, and the Output end links to each other with the lawnmower amplifier, and the Coupled end links to each other with radio-frequency bias source (attenuator behind the oscillator).The SQUID signal that the Input end is obtained from rf SQUID resonator passes through the main channel forward transmitted to the lawnmower amplifier, and inserting loss is 1.0-1.5dB.The radio-frequency current signal that oscillator produces is transferred to the Input end from the input of Coupled end, then passes to the resonant tank of rfSQUID downwards and makes bias current, and the degree of coupling is 20dB.As seen directional coupler has been arranged, only linked to each other between rf SQUID and the operating circuit and just can realize the two-way transmission of radiofrequency signal with a transmission line.Termination termination 50 Ω resistance reach impedance matching.
2. radio frequency amplifier (RF Amplifier)
Radio frequency amplifier is that the signal that extracts among the SQUID is amplified, and the frequency conversion detection goes out measured signal again.Signal power pact-the 90dBm that the SQUID probe is sent into the radio frequency amplifier first order arrives-70dBm, and according to frequency mixer radio frequency input requirement, the power RF amplifier enlargement factor is that 40dB is to 60dB.Radio-frequency amplifier circuit figure in the present embodiment forms by three grades shown in Fig. 3 (c) altogether.The first order is formed power gain 15dB, noise figure 1.0dB-1.5dB by the AT-41511 low-noise tube that Mini-Circuits company produces.The second level is formed for the MAR-6 that Mini-Circuits company produces, gain 16dB, and bandwidth is that DC is to 2000MHz.The third level is formed for the RF2301 that Mini-Circuits company produces, power gain 20dB, and bandwidth 300MHz is to 2500MHz.The general power of three grades of lawnmower amplifiers like this gains at 40dB between the 50dB.Radio frequency amplifier will be placed in the shielding box, is the coupling between reducing every grade, the level with grade between shielding and preceding put and other circuit between shielding to carry out.
3. RF Voltage-Controlled Oscillator (Voltage Controlled Oscillator)
The JTOS-1650 that the integrated voltage controlled oscillator of present embodiment is produced for Mini-Circuits company.Its several indexs are as follows:
Frequency range: 1200-1650MHz
Output power: 7.0dBm
Power supply power supply :+12V, 30mA
Adjust voltage range: 1.0V-13.0V.
Adjust voltage sensitivity (Turning Sensitivity MHz/V): 50.0-90.0MHz/V.This index is meant the variation of the oscillation frequency that the every variation of adjustment voltage 1.0V causes.
Supply-voltage sensitivity (Pushing MHz/V): 1.5MHz/V.This index is meant the variation of the oscillation frequency that the every variation of supply voltage 1.0V causes.The fluctuation of its expression supply voltage is to the influence of oscillation frequency.The numerical value of this index should be the smaller the better.
Voltage-controlled oscillator circuit figure in the present embodiment is shown in Fig. 3 (d).U3 is the oscillator JTOS-1650 that Mini-Circuits company produces among the figure.The radiofrequency signal one tunnel that is produced is given adjustable attenuator, and frequency mixer is given on another road.Power input V-CC and adjustment voltage end VVCO have added L-C π type filter network, isolated DC and radiofrequency signal and stable DC voltage.When adjusting voltage when 1.0V changes to 13.0V, the oscillation frequency of voltage controlled oscillator will change to 1836.10MHz from 1092.46MHz.Adjusting voltage is 7.0V, and oscillation frequency is 1501.99MHz.
4. frequency mixer (Mixer)
Frequency mixer in the present embodiment is the TUF-5 that Mini-Circuits company produces.
Its frequency range is: local oscillator/radio frequency (LO/RF) 20-1500MHz, intermediate frequency (IF) DC-1000MHz.
Its conversion loss is 9dB.
Its isolation is at intermediate bands (Mid-Band): LO-RF is 30dB; LO-IF is 18dB.
Its circuit diagram is shown in Fig. 3 (e).C21 feed-in radiofrequency signal, C48 feed-in radio-frequency (RF) local oscillator signal.C42 is a rf filtering electric capacity.
5. variable attenuator (Attenator)
Variable attenuator in the present embodiment is a 4PIN pipe π type attenuator, shown in Fig. 3 (f).+ 5V is a power supply, and VATT is the adjustable voltage input end.HSMP-3814 is the PIN pipe.Change the DC voltage of VATT, the attenuation multiple of attenuator is along with change.R6, R7 and R32 are π type fixed attenuators, are used for further decay power.Circuit is through test, and in the 1.5GHz scope, damping capacity is-90dBm is to-70dBm at 1.0GHz.
6. low frequency locked loop
Feedback and low-frequency amplifier circuit are formed the low frequency locked loop, make rf SQUID system works not have modulation magnetic flux lock mode, and its circuit diagram is shown in Fig. 3 (g).The signal that goes out from the frequency mixer frequency conversion is through U9, U6 two-stage low-frequency amplifier, amplify 600 times after, enter integrating circuit U7, feed back to SQUID by operational amplifier U8 then.Second level amplifier U6 is a totalizer, and DCLELVE (DC level) level adds from an end of totalizer, adjusts the magnitude of voltage of DCLELVE, can change keyed end.U7, R16, R27 and C25 form integrating circuit, and resistance R 27 makes operational amplifier U7 closed-loop dc.U5 is the follower output stage.MAX4622 (S3) is " open loop/locking " switch, and MAX318 (S4) is " resetting " switch.The U8 that forms feedback circuit also is a totalizer, and from then on the DCFLUX level adds, and regulates DCFLUX and can change the magnetic flux of sending into SQUID.
Radio frequency operation circuit debugging result: radio frequency operation circuit performance after tested is normal.HTc rf SQUID frequency adjustable scope be 1GHz to 1.5GHz, in this frequency range, can detect triangular wave, can normally lock during closed loop.Behind alternative " open circuit/locking " and " resetting " two mechanical switchs of analog switch, low-frequency channel is working properly, can it normally be resetted and lock by far-end control HTc rf SQUID outside screened room.
Claims (4)
1. high-temperature superconductor rf squid system comprises probe and radio frequency operation circuit, and it is characterized in that: described probe comprises the superconducting thin film flux concentrator, superconducting thin film coplanar resonator, superconducting quantum interference device spare, microwave coupling ring; Described superconducting quantum interference device spare is positioned at described flux concentrator top; Described coplanar resonator is the hollow coplanar resonator that is made of three inc loop wires, this coplanar resonator and described flux concentrator are separated, and be positioned at described superconducting quantum interference device spare top, be between described superconducting quantum interference device spare and the described microwave coupling ring.
2. high-temperature superconductor rf squid as claimed in claim 1 system is characterized in that: be provided with certain thickness pad between hollow coplanar resonator in the described probe and the described superconducting quantum interference device spare.
3. high-temperature superconductor rf squid as claimed in claim 1 or 2 system, it is characterized in that: described hollow coplanar resonator is produced on 10 * 10mm
2Substrate on; Described three not the width of closed loop wire be 200 μ m, wire spacing is 100 μ m, the length of side of middle loop wire or diameter are 4.4mm; Opening length on described three not closed loop wires is 50 μ m, and outer shroud becomes 180 ° of angles with middle ring opening part; The frequency of operation of described radio frequency operation circuit is between 1.23～1.42GHz, and centre frequency is 1.3GHz.
4. high-temperature superconductor rf squid as claimed in claim 3 system, it is characterized in that: described substrate is LaAlO
3Substrate or SrTiO
3Substrate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03275753 CN2638073Y (en) | 2003-07-15 | 2003-07-15 | High temp superconducting radio-frequency quantum interference device system |
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|---|---|---|---|
| CN 03275753 CN2638073Y (en) | 2003-07-15 | 2003-07-15 | High temp superconducting radio-frequency quantum interference device system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923153A (en) * | 2010-06-25 | 2010-12-22 | 中国科学院上海微系统与信息技术研究所 | Calibration method for multichannel SQUID (Superconducting Quantum Interference Device) biological magnetic system |
| CN102175980A (en) * | 2011-02-21 | 2011-09-07 | 吉林大学 | High-temperature superconducting magnetometer measurement and control device capable of automatically locking work point |
| CN105593695A (en) * | 2013-10-01 | 2016-05-18 | 盖迪科斯系统公司 | Dual squid measurement device |
| WO2018055467A1 (en) * | 2016-09-26 | 2018-03-29 | International Business Machines Corporation | Routing quantum signals in the microwave domain using time dependent switching |
| CN108089057A (en) * | 2018-01-26 | 2018-05-29 | 吉林大学 | A kind of test platform that test is transported for ultralow temperature photoelectricity |
| CN109219822A (en) * | 2016-04-25 | 2019-01-15 | 谷歌有限责任公司 | Coupling framework for superconducting flux quantum bit |
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2003
- 2003-07-15 CN CN 03275753 patent/CN2638073Y/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923153A (en) * | 2010-06-25 | 2010-12-22 | 中国科学院上海微系统与信息技术研究所 | Calibration method for multichannel SQUID (Superconducting Quantum Interference Device) biological magnetic system |
| CN102175980A (en) * | 2011-02-21 | 2011-09-07 | 吉林大学 | High-temperature superconducting magnetometer measurement and control device capable of automatically locking work point |
| CN102175980B (en) * | 2011-02-21 | 2014-03-12 | 吉林大学 | Control device of high-temperature superconducting magnetometer measurement capable of automatically locking work point |
| CN105593695B (en) * | 2013-10-01 | 2018-09-11 | 盖迪科斯系统公司 | Double SQUID measuring devices |
| CN105593695A (en) * | 2013-10-01 | 2016-05-18 | 盖迪科斯系统公司 | Dual squid measurement device |
| CN109219822A (en) * | 2016-04-25 | 2019-01-15 | 谷歌有限责任公司 | Coupling framework for superconducting flux quantum bit |
| CN109219822B (en) * | 2016-04-25 | 2022-04-12 | 谷歌有限责任公司 | Coupling architecture for superconducting flux qubits |
| WO2018055467A1 (en) * | 2016-09-26 | 2018-03-29 | International Business Machines Corporation | Routing quantum signals in the microwave domain using time dependent switching |
| CN109716650A (en) * | 2016-09-26 | 2019-05-03 | 国际商业机器公司 | It is switched in using time correlation and routes quantum signal in microwave domain |
| GB2569483A (en) * | 2016-09-26 | 2019-06-19 | Ibm | Routing quantum signals in the microwave domain using time dependent switching |
| US10628752B2 (en) | 2016-09-26 | 2020-04-21 | International Business Machines Corporation | Routing quantum signals in the microwave domain using time dependent switching |
| US11599819B2 (en) | 2016-09-26 | 2023-03-07 | International Business Machines Corporation | Routing quantum signals in the microwave domain using time dependent switching |
| CN108089057A (en) * | 2018-01-26 | 2018-05-29 | 吉林大学 | A kind of test platform that test is transported for ultralow temperature photoelectricity |
| CN108089057B (en) * | 2018-01-26 | 2019-09-17 | 吉林大学 | A kind of test platform transporting test for ultralow temperature photoelectricity |
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