Spin-orbit qubit using quantum dots
| DWPI Title: Method for quantum information processing using lateral double quantum dot arranged at substrate surface, involves populating first quantum dot with confined electrons, and transferring electron to second quantum dot to create charge state |
| Abstract: Methods and apparatus of quantum information processing using quantum dots are provided. Electrons from a 2DEG are confined to the quantum dots and subjected to a magnetic field having a component directed parallel to the interface. Due to interfacial asymmetries, there is created an effective magnetic field that perturbs the energies of the spin states via an interfacial spin-orbit (SO) interaction. This SO interaction is utilized to controllably produce rotations of the electronic spin state, such as X-rotations of the electronic spin state in a double quantum dot (DQD) singlet-triplet (ST) qubit. The desired state rotations are controlled solely by the use of electrical pulses. |
| Use: Method for quantum information processing using a lateral double quantum dot arranged at a silicon substrate surface overlain by a layer of silicon oxide. |
| Advantage: Low overhead, low stress, improved impurity gettering, low drift, and the ability to use donor implantation, high-temperature anneal for damage repair are ensured. |
| Novelty: The method involves populating a first quantum dot with two confined electrons, and transferring one confined electron to a second quantum dot to create a charge state. Two state rotations are performed on the confined electrons while the lateral double quantum dot (DQD) is in the charge state, and a final quantum state of the DQD is read out. The two state rotations are performed while exposing the DQD to an externally sourced magnetic field having a component directed parallel to the substrate surface. |
| Filed: 6/29/2018 |
| Application Number: US16023211A |
| Tech ID: SD 14749.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
| Data from Derwent World Patents Index, provided by Clarivate All rights reserved. Republication or redistribution of Clarivate content, including by framing or similar means, is prohibited without the prior written consent of Clarivate. Clarivate and its logo, as well as all other trademarks used herein are trademarks of their respective owners and used under license. |