Superconducting tunable coupler
First Claim
1. A superconducting system comprising:
- a coplanar superconducting circuit comprising;
a first ground plane region;
a second ground plane region electrically isolated from the first ground plane region by portions of the coplanar superconducting circuit; and
a tunable coupler having a first port and a second port, the tunable coupler comprising;
a variable inductance coupling element coupled between the first port and the second port;
a first termination inductor having a first end coupled between a first end of the variable inductance element and a second end coupled to the first ground plane region; and
a second termination inductor having a first end coupled between a second end of the variable inductance element and a second end coupled to the second ground plane region.
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Accused Products
Abstract
A superconducting system is provided that includes a coplanar superconducting circuit. The coplanar superconducting circuit includes a first ground plane region, a second ground plane region electrically isolated from the first ground plane region by portions of the coplanar superconducting circuit, and a tunable coupler having a first port and a second port. The tunable coupler comprises a variable inductance coupling element coupled between the first port and the second port, a first termination inductor having a first end coupled between a first end of the variable inductance element and a second end coupled to the first ground plane region, and a second termination inductor having a first end coupled between a second end of the variable inductance element and a second end coupled to the second ground plane region.
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Citations
20 Claims
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1. A superconducting system comprising:
a coplanar superconducting circuit comprising; a first ground plane region; a second ground plane region electrically isolated from the first ground plane region by portions of the coplanar superconducting circuit; and a tunable coupler having a first port and a second port, the tunable coupler comprising; a variable inductance coupling element coupled between the first port and the second port; a first termination inductor having a first end coupled between a first end of the variable inductance element and a second end coupled to the first ground plane region; and a second termination inductor having a first end coupled between a second end of the variable inductance element and a second end coupled to the second ground plane region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A superconducting system comprising:
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a coplanar circuit comprising; a first ground plane region; a second ground plane region electrically isolated from the first ground plane region by portions of the superconducting circuit; and a tunable coupler having a first port and a second port, the tunable coupler comprising; a Josephson junction; a first termination inductor having a first end coupled between a first end of the Josephson junction and the first port and a second end coupled to the first ground plane region; a second termination inductor having a first end coupled between a second end of the Josephson junction and the second port and a second end coupled to the second ground plane region; a third termination inductor having a first end coupled between the first end of the Josephson junction and the first port and a second end coupled to the second ground plane region; and a fourth termination inductor having a first end coupled between the second end of the Josephson junction and the second port and a second end coupled to the first ground plane region, wherein the equivalent inductance of the first and third termination inductors, the Josephson junction and the equivalent inductance of the second and fourth termination inductors combine to form an RF SQUID; and a controller configured to control the inductance of the Josephson junction between a low inductance state to provide strong coupling between a first device coupled to the first port and a second device coupled to the second port, and a high inductance state to provide isolation between the first device and the second device. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A superconducting coplanar circuit comprising:
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a first ground plane region; a second ground plane region electrically isolated from the first ground plane region by portions of the superconducting coplanar circuit; and a tunable coupler having a first port and a second port, the tunable coupler comprising; a variable inductance coupling element; a first termination inductor having a first end coupled between a first end of the variable inductance element and the first port and a second end coupled to the first ground plane region; a second termination inductor having a first end coupled between a second end of the variable inductance element and the second port and a second end coupled to the second ground plane region; a third termination inductor having a first end coupled between the first end of the Josephson junction and the first port and a second end coupled to the second ground plane region; a fourth termination inductor having a first end coupled between the second end of the Josephson junction and the second port and a second end coupled to the first ground plane region; and a fifth inductor having a first end coupled to the Josephson junction, and a second end coupled between the first and third termination inductors, wherein the equivalent inductance of the first and third termination inductors, the Josephson junction and the equivalent inductance of the second and fourth termination inductors and fifth inductor combine to form an RF SQUID; a qubit coupled to the first port; and a bias inductor inductively coupled to the RF SQUID, wherein an amount of current through the bias inductor controls the coupling strength between the qubit and a second device coupled to the second port. - View Dependent Claims (18, 19, 20)
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Specification