US 12,475,399 B2
Systems and methods for increasing energy-scale by minimizing qubit inductance
Emile M. Hoskinson, Vancouver (CA)
Assigned to D-WAVE SYSTEMS INC., Burnaby (CA)
Appl. No. 18/718,588
Filed by D-WAVE SYSTEMS INC., Burnaby (CA)
PCT Filed Dec. 14, 2022, PCT No. PCT/US2022/081515
§ 371(c)(1), (2) Date Jun. 11, 2024,
PCT Pub. No. WO2023/219656, PCT Pub. Date Nov. 16, 2023.
Claims priority of provisional application 63/265,388, filed on Dec. 14, 2021.
Prior Publication US 2025/0053842 A1, Feb. 13, 2025
Int. Cl. H03K 17/92 (2006.01); G06N 10/40 (2022.01)
CPC G06N 10/40 (2022.01) [H03K 17/92 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for increasing available qubit energy scale in a hybrid computing system, the hybrid computing system comprising a quantum processor and at least one digital processor, the quantum processor comprising a plurality of qubits and couplers, each qubit having a respective qubit body comprising a loop of superconducting material interrupted by at least one compound-compound Josephson junction (CCJJ), the qubit body communicatively coupled to an inductance tuner (L-tuner), the method executed by the at least one digital processor and comprising:
causing a respective L-tuner of at least a set of qubits to compensate for a coupler inductance loading;
determining a remaining respective L-tuner range for each qubit in the set of qubits;
computing a minimum homogenized inductance across all qubits in the set of qubits from the remaining respective L-tuner range;
causing a respective L-tuner of each qubit in the set of qubits to apply an inductance AL to each qubit in the set of qubits to achieve the minimum homogenized inductance;
computing a first shift in CCJJ bias Δ′CCJJ due to the applied inductance AL; and
causing a respective CCJJ offset DAC of each qubit in the set of qubits to apply a respective second shift in CCJJ bias Δ″CCJJ to each qubit in the set of qubits to compensate for the first shift in CCJJ bias.