{
  "patent_number": "US 11295225",
  "country": "US",
  "title": "How D-Wave Clears Magnetic Noise in Quantum Computers",
  "original_title": "Superconducting quantum processor and method of operating same",
  "summary": "A method for improving quantum computer accuracy by actively clearing out magnetic interference that builds up during calculations.",
  "what_it_does": "Quantum processors often suffer from 'spin-bath polarization,' which is essentially magnetic noise that builds up in the environment surrounding the qubits during a calculation. This patent describes a way to reset this environment by forcing the qubit into an opposite state after a calculation is finished. By raising a 'tunneling barrier'—which acts like a gate to lock the qubit's state—the system holds the qubit in this corrective position for a specific amount of time. This process effectively depolarizes the surrounding environment, allowing the quantum processor to start its next calculation without the lingering magnetic interference from the previous one.",
  "what_it_does_not_cover": [
    "Does not cover passive cooling techniques that do not involve active qubit state manipulation",
    "Does not cover quantum gate-based processors that do not utilize quantum annealing cycles",
    "Does not cover error correction methods that rely solely on software algorithms rather than physical qubit state latching",
    "Does not cover systems that do not use superconducting qubits"
  ],
  "filed": "2018-07-06",
  "granted": "2022-04-05",
  "expires": "2038-07-06",
  "status": "active",
  "holder": "D Wave Systems Inc",
  "holder_url": "https://patentbrief.org/company/d-wave-systems-inc",
  "inventors": [
    {
      "name": "Emile M. Hoskinson",
      "url": "https://patentbrief.org/inventor/emile-m-hoskinson"
    },
    {
      "name": "Trevor Michael Lanting",
      "url": "https://patentbrief.org/inventor/trevor-michael-lanting"
    }
  ],
  "times_cited": 13,
  "tags": [
    "semiconductors",
    "ai_ml",
    "consumer_electronics"
  ],
  "abstract": "Passive and actives approaches to mitigating the effects of spin-bath polarization are described and illustrated. Such may, for example, include at least partially depolarizing the spin-bath polarization, for instance by: performing an annealing cycle by the quantum processor to generate a final state of a qubit of the quantum processor; flipping the final state of the qubit of the quantum processor to an opposite state; and latching the qubit in the opposite state for a predetermined duration.",
  "url": "https://patentbrief.org/patent/us/11295225/superconducting-quantum-processor-and-method-of-operating-same",
  "markdown_url": "https://patentbrief.org/patent/us/11295225/superconducting-quantum-processor-and-method-of-operating-same/md",
  "google_patents_url": "https://patents.google.com/patent/US11295225",
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}