# US 2026/0107698 A1 · Quantum device, method, and apparatus with tunable resonant frequency > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0107698 A1 - Document ID: US20260107698A1 - Status: Published application - Kind: A1 - Application number: 19/079,622 - Filed: 2025-03-14 - Published: 2026-04-16 - Earliest claimed: 2024-10-15 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Daeyun KIM - Web page: https://patentgrep.com/patent/US20260107698A1 ## CPC - H10N 69/00: Integrated devices, or assemblies of multiple devices, comprising at least one superconducting element covered by group H10N60/00 - G06N 10/40: Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control - H10N 60/12: Josephson-effect devices - H10N 60/805: {for Josephson-effect devices} - H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR - G06N: COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS ## Abstract A quantum device with a tunable resonant frequency including a ferromagnetic link including a ferromagnetic material and a first superconducting layer and a second superconducting layer coupled to each other by the ferromagnetic link, the ferromagnetic link being configured in a magnetization configuration arranged in a first arrangement corresponding to a first resonant frequency of the quantum device or in a second arrangement corresponding to a second resonant frequency of the quantum device. ## Claims ### Claim 1 A quantum device with a tunable resonant frequency, the quantum device comprising: a ferromagnetic link comprising a ferromagnetic material; and a first superconducting layer and a second superconducting layer coupled to each other by the ferromagnetic link, wherein the ferromagnetic link is configured in a magnetization configuration arranged in a first arrangement corresponding to a first resonant frequency of the quantum device or in a second arrangement corresponding to a second resonant frequency of the quantum device. ### Claim 2 (depends on 1) The quantum device of claim 1, wherein the magnetization configuration is configured to generate skyrmions in the first arrangement and to destroy the skyrmions in the second arrangement. ### Claim 3 (depends on 1) The quantum device of claim 1, wherein the tunable resonant frequency is discretely tuned based on an arrangement of the magnetization configuration. ### Claim 4 (depends on 1) The quantum device of claim 1, wherein the magnetization configuration is changed by an applied external signal to be arranged in the first arrangement or the second arrangement. ### Claim 5 (depends on 1) The quantum device of claim 1, wherein the tunable resonant frequency of the quantum device is determined as an arrangement of the magnetization configuration, and wherein the magnetization configuration is changed by an applied external signal. ### Claim 6 (depends on 1) The quantum device of claim 1, wherein an application of an external signal causes a formation of skyrmions to form to implement one of the first resonant frequency and the second resonant frequency. ### Claim 7 (depends on 1) The quantum device of claim 1, wherein, each of the first resonant frequency and the second resonant frequency are reproducible in response to respective external signals being applied to the ferromagnetic link. ### Claim 8 (depends on 1) The quantum device of claim 1, wherein the magnetization configuration is arranged in the first arrangement in response to a first external signal, and wherein the magnetization configuration is changed from the first arrangement to the second arrangement in response to a second external signal. ### Claim 9 (depends on 8) The quantum device of claim 8, further comprising: a wire arranged adjacent to the ferromagnetic link; processors configured to execute instructions; and a memory storing the instructions, wherein execution of the instructions configures the processors to: control an electric current flowing through the wire to create external magnetic fields to generate the first external signal and the second external signal, and wherein the first external signal and the second external signal are selectively applied to the ferromagnetic link by the wire. ### Claim 10 (depends on 9) The quantum device of claim 9, wherein an arrangement of the magnetization configuration is determined based on a direction or a strength of the electric current applied to the ferromagnetic link. ### Claim 11 (depends on 1) The quantum device of claim 1, wherein, when a first current in a first direction is applied to the ferromagnetic link, the magnetization configuration is arranged in the first arrangement, and wherein, when a second current in a second direction opposite to the first direction is applied to the ferromagnetic link, the magnetization configuration is changed from the first arrangement to the second arrangement. ### Claim 12 (depends on 1) The quantum device of claim 1, further comprising: a laser configured to apply laser pulses to the ferromagnetic link; processors configured to execute instructions; and a memory storing the instructions, wherein execution of the instructions configures the processors to: control a strength of a laser pulse of the laser pulses being selectively applied to the ferromagnetic link to change an arrangement of the magnetization configuration. ### Claim 13 (depends on 12) The quantum device of claim 12, wherein a time to rearrange the magnetization configuration is determined based on a duration of the laser pulse applied to the ferromagnetic link. ### Claim 14 (depends on 1) The quantum device of claim 1, wherein the quantum device comprises a cubit of a quantum circuit. ### Claim 15 (depends on 1) The quantum device of claim 1, wherein the quantum device comprises a cubit coupler of a quantum circuit. ### Claim 16 An method of controlling a cubit coupler, the method comprising: coupling cubits by applying a first external signal to the cubit coupler to allow a magnetization configuration of a ferromagnetic link, the ferromagnetic link being configured to couple a first superconducting layer and a second superconducting layer of the cubit coupler, to be arranged in a first arrangement to configure the cubit coupler to have a first resonant frequency; and decoupling the cubits by applying a second external signal to the cubit coupler to allow the magnetization configuration of the ferromagnetic link to be arranged in a second arrangement to configure the cubit coupler to have a second resonant frequency. ### Claim 17 (depends on 16) The method of claim 16, wherein the magnetization configuration is configured to generate skyrmions in the first arrangement and to destroy the skyrmions in the second arrangement. ### Claim 18 (depends on 16) The method of claim 16, wherein the coupling of the cubits comprises: applying the first external signal to align the magnetization configuration to be arranged in the first arrangement; and removing the first external signal to allow a resonant frequency of the cubit coupler to be maintained as the first resonant frequency. ### Claim 19 (depends on 16) The method of claim 16, wherein the decoupling of the cubits comprises: applying the second external signal to align the magnetization configuration to be arranged in the second arrangement; and removing the second external signal to allow a resonant frequency of the cubit coupler to be maintained as the second resonant frequency. ### Claim 20 (depends on 16) The method of claim 16, further comprising: applying the first external signal and the second external signal to the ferromagnetic link, wherein the first external signal and the second external signal comprise one of: a first external magnetic field and a second external magnetic field, the first external magnetic field and the second external magnetic field having different strengths or directions; a first electric current and a second electric current, the first electric current and the second electric current having different directions or strengths; and a first laser pulse and a second laser pulse, the first laser pulse and the second laser pulse having different strengths.