# US 2021/0280633 A1 · Flux bias line local heating device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0280633 A1 - Document ID: US20210280633A1 - Status: Published application - Kind: A1 - Application number: 16/808,991 - Filed: 2020-03-04 - Published: 2021-09-09 - Earliest claimed: 2020-03-04 - Assignees: International Business Machines Corporation - Applicants: International Business Machines Corporation - Inventors: Rasit Onur Topaloglu; Vivekananda P. Adiga; Martin O. Sandberg - Web page: https://patentgrep.com/patent/US20210280633A1 ## CPC - H10N 69/00: Integrated devices, or assemblies of multiple devices, comprising at least one superconducting element covered by group H10N60/00 - H10N 60/12: Josephson-effect devices - H10N 60/805: {for Josephson-effect devices} - H10N 60/30: Devices switchable between superconducting and normal states - H10N 60/84: Switching means for devices switchable between superconducting and normal states - H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR ## Abstract Devices, systems, and/or methods that can facilitate local heating of a superconducting flux biasing loop are provided. According to an embodiment, a device can comprise a substrate having a superconducting flux bias circuit comprising a biasing loop coupled to a flux controlled qubit device. The device can further comprise a heating device coupled to the biasing loop. ## Claims ### Claim 1 A device, comprising: a substrate having a superconducting flux bias circuit comprising a biasing loop coupled to a flux controlled qubit device; and a heating device coupled to the biasing loop. ### Claim 2 (depends on 1) The device of claim 1, wherein the biasing loop comprises a persistent flux bias loop, and wherein the flux controlled qubit device comprises at least one of a qubit or a superconducting quantum interference device loop. ### Claim 3 (depends on 1) The device of claim 1, wherein the heating device comprises a resistor thermally coupled to the biasing loop. ### Claim 4 (depends on 1) The device of claim 1, wherein the heating device comprises superconducting heater bias wires coupled to a resistive material. ### Claim 5 (depends on 1) The device of claim 1, wherein the heating device comprises superconducting heater bias wires having a first critical temperature that is higher than a second critical temperature of the biasing loop. ### Claim 6 (depends on 1) The device of claim 1, wherein the heating device is thermally coupled to the biasing loop to heat at least one segment of the biasing loop above a critical temperature of the biasing loop. ### Claim 7 (depends on 1) The device of claim 1, wherein the heating device is thermally coupled to the biasing loop to control superconductivity of the biasing loop and a magnetic field of the biasing loop, thereby facilitating at least one of improved fidelity of the flux controlled qubit device, improved fidelity of a quantum device comprising the flux controlled qubit device, or improved performance of the quantum device comprising the flux controlled qubit device. ### Claim 8 A device, comprising: a superconducting flux bias circuit comprising a flux controlled qubit device coupled to a biasing loop comprising a first critical temperature material and a second critical temperature material; and a heating device coupled to the biasing loop. ### Claim 9 (depends on 8) The device of claim 8, wherein the first critical temperature material comprises a first superconducting material having a first critical temperature and the second critical temperature material comprises a second superconducting material having a second critical temperature that is lower than the first critical temperature. ### Claim 10 (depends on 8) The device of claim 8, wherein the biasing loop comprises a persistent flux bias loop, and wherein the flux controlled qubit device comprises at least one of a qubit or a superconducting quantum interference device loop. ### Claim 11 (depends on 8) The device of claim 8, wherein the heating device comprises a resistor thermally coupled to the biasing loop. ### Claim 12 (depends on 8) The device of claim 8, wherein the heating device comprises superconducting heater bias wires coupled to a resistive material. ### Claim 13 (depends on 8) The device of claim 8, wherein the heating device comprises superconducting heater bias wires having a critical temperature that is higher than at least one of a first critical temperature of the first critical temperature material or a second critical temperature of the second critical temperature material. ### Claim 14 (depends on 8) The device of claim 8, wherein the heating device is thermally coupled to the biasing loop to heat the second critical temperature material above a critical temperature of the second critical temperature material. ### Claim 15 A device, comprising: a substrate having superconducting flux bias circuits comprising biasing loops coupled to flux controlled qubit devices; and one or more heating devices coupled to one or more of the biasing loops and one or more control circuit wires formed on the substrate. ### Claim 16 (depends on 15) The device of claim 15, wherein at least one of the one or more control circuit wires or the one or more heating devices is coupled to one or more tunable resistors to control operation of the one or more heating devices. ### Claim 17 (depends on 15) The device of claim 15, wherein at least one of the one or more control circuit wires or the one or more heating devices is coupled to one or more switches to control operation of the one or more heating devices. ### Claim 18 (depends on 15) The device of claim 15, wherein the biasing loops comprise persistent flux bias loops, and wherein the flux controlled qubit devices comprise at least one of qubits or superconducting quantum interference device loops. ### Claim 19 (depends on 15) The device of claim 15, wherein at least one of the one or more heating devices is thermally coupled to at least one biasing loop of the biasing loops to heat one or more segments of the at least one biasing loop above a critical temperature of the at least one biasing loop. ### Claim 20 (depends on 15) The device of claim 15, wherein at least one of the one or more heating devices is thermally coupled to at least one biasing loop of the biasing loops to control superconductivity and magnetic fields of the at least one biasing loop, thereby facilitating at least one of improved fidelity of at least one flux controlled qubit device of the flux controlled qubit devices, improved fidelity of a quantum device comprising the at least one flux controlled qubit device, or improved performance of the quantum device comprising the at least one flux controlled qubit device.