Granted Patent
B2
US 12,206,385 · App. 17/862,605 · Granted Jan 21, 2025
Systems and methods for coupling a superconducting transmission line to an array of resonators
Inventors:
Jed D. Whittaker (Vancouver, CA); Loren J. Swenson (San Jose, CA); Mark H. Volkmann (Burnaby, CA)
Assignee:
D-WAVE SYSTEMS INC.
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Abstract
A superconducting circuit may include a transmission line having at least one transmission line inductance, a superconducting resonator, and a coupling capacitance that communicatively couples the superconducting resonator to the transmission line. The transmission line inductance may have a value selected to at least partially compensate for a variation in a characteristic impedance of the transmission line, the variation caused at least in part by the coupling capacitance. The coupling capacitance may be distributed along the length of the transmission line. A superconducting circuit may include a transmission line having at least one transmission line capacitance, a superconducting resonator, and a coupling inductance that communicatively couples the superconducting resonator to the transmission line. The transmission line capacitance may be selected to at least partially compensate for a variation in coupling strength between the superconducting resonator and the transmission line.
Claims (25)
1. A superconducting circuit comprising:
a transmission line, the transmission line comprising at least one transmission line capacitance;
a superconducting resonator;
a coupling inductance that inductively communicatively couples the superconducting resonator to the transmission line, wherein the at least one transmission line capacitance includes:
a first capacitance upstream of the superconducting resonator; and
a second capacitance downstream of the superconducting resonator, wherein a value of the at least one transmission line capacitance is selected to at least partially compensate for a variation in coupling strength between the superconducting resonator and the transmission line.
2. The superconducting circuit of claim 1 , wherein the superconducting resonator comprises:
a loop of superconducting material comprising;
a first resonator inductance coupled between the transmission line and a first DC superconducting quantum interference device (SQUID);
a second DC superconducting quantum interference device (SQUID) coupled between the first DC SQUID and a resonator capacitance; and
a second resonator inductance coupled between the resonator capacitance and the transmission line.
3. The superconducting circuit of claim 2 , further comprising a first interface operable to apply a first flux bias to the first DC SQUID, and a second interface operable to apply a second flux bias to the second DC SQUID.
4. The superconducting circuit of claim 1 , wherein a value of at least one of the first and the second capacitance is selected to at least partially compensate for a variation in coupling strength between the superconducting resonator and the transmission line.
5. The superconducting circuit of claim 1 , wherein the coupling inductance that inductively communicatively couples the superconducting resonator to the transmission line is a kinetic inductance.
6. The superconducting circuit of claim 1 , wherein the superconducting resonator is strongly-coupled to the transmission line.
7. The superconducting circuit of claim 1 , wherein the transmission line is a coaxial transmission line.
8. The superconducting circuit of claim 1 , wherein the transmission line is a coplanar waveguide.
9. The superconducting circuit of claim 1 , operable to readout data from a quantum device.
10. The superconducting circuit of claim 1 , operable to load data into a quantum device.
11. The superconducting circuit of claim 1 , wherein the transmission line capacitance is proximate the superconducting resonator.
12. The superconducting circuit of claim 1 , further comprising:
a shift register stage; and
an interface operable to apply a flux bias to the shift register stage.
13. The superconducting circuit of claim 1 , wherein the superconducting resonator is one of a plurality of superconducting resonators in an array of superconducting resonators, each of the plurality of superconducting resonators coupled to the transmission line.
14. The superconducting circuit of claim 1 , wherein the transmission line is a microwave transmission line, and the superconducting resonator is a microwave superconducting resonator.
Assignments (6)
RELEASE OF SECURITY INTEREST
Recorded Mar 11, 2025
From: PSPIB UNITAS INVESTMENTS II INC.
To: D-WAVE SYSTEMS INC.; 1372934 B.C. LTD.
Reel/Frame 070470/0098 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Dec 9, 2024
From: WHITTAKER, JED D.; SWENSON, LOREN J.; VOLKMANN, MARK H.
To: D-WAVE SYSTEMS INC.
Reel/Frame 069522/0142 →
CHANGE OF NAME
Recorded Dec 9, 2024
From: DWSI HOLDINGS INC.
To: D-WAVE SYSTEMS INC.
Reel/Frame 069522/0375 →
CONTINUATION
Recorded Dec 9, 2024
From: D-WAVE SYSTEMS INC.
To: D-WAVE SYSTEMS INC.
Reel/Frame 069546/0557 →
MERGER
Recorded Dec 9, 2024
From: D-WAVE SYSTEMS INC.; DWSI HOLDINGS INC.
To: DWSI HOLDINGS INC.
Reel/Frame 069546/0581 →
INTELLECTUAL PROPERTY SECURITY AGREEMENT
Recorded Apr 14, 2023
From: D-WAVE SYSTEMS INC.; 1372934 B.C. LTD.
To: PSPIB UNITAS INVESTMENTS II INC., AS COLLATERAL AGENT
Reel/Frame 063340/0888 →
Continuity (3)
Continuation
16975646
Provisional Application
62636043
· Feb 27, 2018
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