Back to results
US 11,108,380 B2Granted
Capacitively-driven tunable coupling
AssigneeNorthrop Grumman Systems Corporation
InventorZachary Kyle Keane
Life of this patent
Estimating the term…
Abstract
A capacitively-driven tunable coupler includes a coupling capacitor connecting an open end of a quantum object (i.e., an end of the object that cannot have a DC path to a low-voltage rail, such as a ground node, without breaking the functionality of the object) to an RF SQUID having a Josephson element capable of providing variable inductance and therefore variable coupling to another quantum object.
Claims10
A superconducting capacitively-driven tunable coupler system comprising:
- first and second quantum objects each having a ground end required to be connected to a DC path to a low-voltage rail and an open end required not to be connected to a DC path to the low-voltage rail;
- a coupler comprising:
- a first coupling capacitor connected between the open end of the first quantum object and a first connecting node;
- a radio-frequency superconducting quantum interference device (RF SQUID) connected between the first connecting node and a second connecting node, the RF SQUID comprising a Josephson element connected between the first connecting node and the second connecting node, wherein the entirety of a path between the first coupling capacitor and the Josephson element is electrically short;
- and
- at least one flux injection element configured to bias the Josephson element to variably weaken the strength of coupling between the first and second quantum objects,
- wherein the objects are coupled together to pass signals between them in the absence of injected flux.
4 more elements
Dependencies are inferred from the claim text.