Quantum dot based qubit devices with on-chip microcoil arrangements

US12050966B2 · kind B2 · utility

Assignee

• Intel Corporation · US

Inventors

• Florian Luethi · Portland, US
• Hubert C. George · Portland, US
• Felix Frederic Leonhard Borjans · Portland, US
• Simon Schaal · Hillsboro, US
• Lester Lampert · Portland, US
• Thomas Francis Watson · Greensboro, US
• Jeanette M. Roberts · North Plains, US
• Jong Seok Park · Suwon-si, KR
• Sushil Subramanian · Hillsboro, US
• Stefano Pellerano · Beaverton, US

Key dates

• Filing date: Dec 20, 2021
• Grant date: Jul 30, 2024
• Expiry date: Oct 30, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10D84/40
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

An array of quantum dot qubits (e.g., an array of spin qubits) relies on a gradient magnetic field to ensure that the qubits are separated in frequency in order to be individually addressable. Furthermore, a strong magnetic field gradient is required to electrically drive the electric dipole spin resonance (EDSR) of the qubits. Quantum dot devices disclosed herein use microcoil arrangements for providing a gradient magnetic field, the microcoil arrangements integrated on the same chip (e.g., on the same die or wafer) as quantum dot qubits themselves. Unlike previous approaches to quantum dot formation and manipulation, various embodiments of the quantum dot devices disclosed herein may enable improved control over magnetic fields and their gradients to realize better frequency targeting of individual qubits, help minimize adverse effects of charge noise on qubit decoherence and provide good scalability in the number of quantum dots included in the device.