Systems and methods for active noise compensation of qubits
Assignee1372934 B.C. Ltd.
InventorEmile M. Hoskinson
Life of this patent
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Abstract
A quantum processor is discussed, the quantum processor having a flux compensation circuit communicatively coupled to a first qubit. The flux compensation circuit includes a quantum flux parametron (QFP) flux pump circuit with a first QFP in communication with the first qubit and a storage circuit with a second Josephson junction and a storage loop coupled in series with the QFP flux pump circuit. The communication between the QFP flux pump circuit and the storage loop is mediated by the second Josephson junction. A first control line is in communication with the first Josephson junction and a second control line is in communication with the second Josephson junction. In use, flux stored in the storage loop back acts on the first qubit.
Claims19
A quantum processor comprising:
- a first qubit;
- a flux compensation circuit communicatively coupled to the first qubit, the flux compensation circuit comprising:
- a quantum flux parametron (QFP) flux pump circuit comprising a first QFP in communication with the first qubit, the first QFP comprising a first Josephson junction;
- a storage circuit comprising a second Josephson junction and a storage loop coupled in series with the QFP flux pump circuit, the communication between the QFP flux pump circuit and the storage loop mediated by the second Josephson junction;
- a first control line in communication with the first Josephson junction;
- and
- a second control line in communication with the second Josephson junction;
- wherein the storage loop is communicatively coupled to the first qubit such that, in use, flux stored in the storage loop back acts on the first qubit.
A flux compensation circuit comprising:
- a quantum flux parametron (QFP) flux pump circuit comprising:
- a first QFP, the first QFP comprising a first Josephson junction;
- a second QFP connected in series with the first QFP, the second QFP comprising a third Josephson junction, the first QFP and the second QFP connected by an inductor;
- a third QFP connected in series with the second QFP, the connection between the second QFP and the third QFP mediated by a fourth Josephson junction;
- a storage circuit comprising a second Josephson junction and a storage loop connected in series with the QFP flux pump circuit, the connection between the QFP flux pump circuit and the storage loop mediated by the second Josephson junction;
- a first control line in communication with the first Josephson junction;
- a second control line in communication with the second Josephson junction;
- a third control line in communication with the third Josephson junction;
- and
- a fourth control line in communication with the fourth Josephson junction.
A method of compensating flux noise in a qubit, the method comprising:
- iteratively, until an exit condition is met:
- projecting information about a flux state of the qubit into a quantum flux parametron (QFP) flux pump circuit;
- copying the information about the flux state of the qubit through the QFP flux pump circuit as a directional current;
- activating a Josephson junction coupled in series with the QFP flux pump circuit to store flux in a storage loop connected to the Josephson junction based on the directional current;
- and
- evaluating the exit condition;
- and
- communicating the flux stored in the storage loop with the qubit to reduce the flux state of the qubit.
Dependencies are inferred from the claim text.