公开(公告)号：US20210196177A1

公开(公告)日：2021-07-01

申请号：US17138696

申请日：2020-12-30

Applicant: X Development LLC

Inventor： Guillaume Verdon-Akzam ,  Xudong Lv ,  Stefan Leichenauer

IPC: A61B5/245 ,  A61B5/00

Abstract: A magnetoencephalography apparatus includes: a lead configured to be secured to a user's head; a first magnetic field sensor attached to the lead, the first magnetic field sensor including a substrate, and an electron spin defect layer on the substrate, the electron spin defect layer including at least one lattice defect, in which a first spin energy level of the at least one lattice defect splits upon exposure to a microwave; and cabling, in which the cabling includes a first microwave transmission line arranged to provide a first microwave field to the electron spin defect layer and in which the cabling includes an optical fiber arranged to provide, from a first end of the optical fiber, a first light signal to the electron spin defect layer and to receive, at the first end of the optical fiber, a second light signal emitted by the electron spin defect layer.

公开(公告)号：US20210103849A1

公开(公告)日：2021-04-08

申请号：US17063660

申请日：2020-10-05

Applicant: X Development LLC

Inventor： Guillaume Verdon-Akzam

IPC: G06N10/00

Abstract: Methods, systems, and apparatus for generating a Gottesman-Kitaev-Preskill (GKP) quantum state that includes a series of Gaussian peaks of target width and target separation embedded in a Gaussian envelope. In one aspect, a method includes obtaining a fourth qudit in an initial state, wherein the initial state comprises a tensor product of a state of a first qudit encoding the Gaussian envelope, a state of a second qudit encoding the target separation, and a state of a third qudit encoding the target width; applying a hybrid digital-analog swap operation to the fourth qudit and a quantum analog register in an initial state to obtain a modified state of the quantum analog register, where the hybrid digital-analog swap operation is based on a swap operation comprising multiple adder operations; and providing the modified state of the quantum analog register as an approximate GKP quantum state.