Tunable coupler for coupling resonant circuits
AssigneeNorthrop Grumman Systems Corporation
InventorsDavid George Ferguson, Jeremy Brendon Clark, Micah John Atman Stoutimore
Life of this patent
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Abstract
A tunable coupler circuit includes a first transmission line, a second transmission line and a three-junction superconducting quantum interference device (SQUID) coupled between the first transmission line and the second transmission line. The three-junction SQUID includes a first Josephson Junction (JJ), a second JJ and a center JJ coupled in parallel to one another such that the first JJ and the center JJ forms a first loop and the second JJ and the center JJ forms a second loop. A resonant frequency of the tunable coupler circuit is tuned based on applying a first flux and a second flux to the first and second loops.
Claims20
A tunable coupler circuit comprising:
- a first transmission line having a first end and a second end, the first transmission line being a quarter wavelength transmission line;
- a second transmission line;
- and
- a three-junction superconducting quantum interference device (SQUID) coupled between the first transmission line and the second transmission line, the three-junction SQUID including a first Josephson Junction (JJ), a second JJ and a center JJ coupled in parallel to one another such that the first JJ and the center JJ forms a first loop and the second JJ and the center JJ forms a second loop, wherein the three-junction SQUID is coupled to the second end of the first transmission line;
- and
- wherein a resonant frequency of the tunable coupler circuit is tuned based on applying a first flux and a second flux to the first and second loops.
A tunable coupler circuit comprising:
- a first transmission line;
- a second transmission line;
- and
- a three-junction superconducting quantum interference device (SQUID) coupled between the first transmission line and the second transmission line, the three-junction SQUID including a first Josephson Junction (JJ), a second JJ and a center JJ coupled in parallel to one another such that the first JJ and the center JJ forms a first loop and the second JJ and the center JJ forms a second loop, and
- wherein a resonant frequency of the tunable coupler circuit is tuned based on applying a first flux and a second flux to the first and second loops, the first flux causes a first loop current to flow in the first loop and a second loop current to flow in the second loop such that the first loop current and the second loop current flow in opposite directions through the center JJ, and the second flux causes a third loop current to flow in the first loop and a fourth loop current to flow in the second loop such that the third loop current and the fourth loop current flow in the same direction through the center JJ.
A system comprising:
- a first resonant circuit having a first resonant frequency;
- a second resonant circuit having a second resonant frequency;
- and
- a tunable coupler circuit coupled between the first resonant circuit and the second resonant circuit, the tunable coupler circuit including:
- a first transmission line;
- a second transmission line;
- and
- a three-junction superconducting quantum interference device (SQUID) coupled between the first transmission line and the second transmission line, the three-junction SQUID including a first Josephson Junction (JJ), a second JJ and a center JJ coupled in parallel to one another such that the first JJ and the center JJ forms a first loop and the second JJ and the center JJ forms a second loop;
- wherein a coupling rate representing a rate of energy transfer between the first resonant circuit and the second resonant circuit is varied by tuning a resonant frequency of the tunable coupler circuit.
Dependencies are inferred from the claim text.