Reconfigurable quantum routing
AssigneeNorthrop Grumman Systems Corporation
InventorsOfer Naaman, Zachary Kyle Keane, Micah John Atman Stoutimore, David George Ferguson
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Abstract
Real-time reconfigurability of quantum object connectivity can be provided with one or more quantum routers that can each be configured as either or both of a single-pole double-throw switch and a cross-point switch. The quantum router includes variable-inductance coupling elements in RF-SQUIDs having inductors transformer-coupled to two control flux lines, one providing a static current and the other providing a dynamic current, the direction of which can be toggled to couple or uncouple quantum objects, such as qubits, based on the dynamic current direction to provide reconfigurable quantum routing.
Claims20
A reconfigurable quantum router system comprising:
- first, second, and third quantum objects respectively connected to first, second, and third ports of a quantum router, the quantum router comprising:
- at least two variable-inductance coupling elements each in a respective RF-SQUID, at least two of the variable-inductance coupling elements being connected to at least one shared inductor such that the respective RF-SQUIDs of the at least two of the variable-inductance coupling elements share the shared inductor in common;
- first and second control flux lines, wherein the first control flux line is configured to inductively provide a static current to at least two of the variable-inductance coupling elements and the second control flux line is configured to provide a dynamic current to at least two of the variable-inductance coupling elements;
- and
- first, second, and third resonators by which the first, second, and third quantum objects are respectively each connected to at least a respective one of the RF-SQUIDs;
- wherein actuation of a direction of the dynamic current couples at least the first quantum object to only one of the second or third quantum objects based on the dynamic current direction to provide reconfigurable quantum routing.
A method of reconfigurable quantum routing comprising:
- providing a static control signal to one of
- a first flux line that is inductively coupled to two RF-SQUIDs via at least one common inductor to induce a current split between variable inductance coupling elements in respective ones of the RF-SQUIDs, or
- a second flux line that is inductively coupled to the two RF SQUIDs or another two RF SQUIDs via other inductors;
- providing a dynamic control signal to another of the first flux line or the second flux line, such that a difference between induced common flux current and induced dynamic flux current places at least one of the variable inductance coupling elements in one of a high or low inductance state and places at least another of the variable inductance coupling elements in another of the high or low inductance state;
- actuating a direction of the dynamic control signal to couple at least a first quantum object to only one of at least two other quantum objects.
A reconfigurable quantum router comprising:
- first, second, and third ports each coupleable to respective first, second, and third qubits;
- first, second, and third resonators each respectively connected between the first, second, and third ports and an RF-SQUID bridge, the RF-SQUID bridge comprising:
- a first Josephson junction connected between the first resonator and the second resonator;
- and
- a second Josephson junction connected between the first resonator and the third resonator;
- and
- first and second flux lines arranged to switch respective inductances of the first and second Josephson junctions between high and low inductance states to selectively couple or uncouple qubits connected to the ports.
Dependencies are inferred from the claim text.