公开(公告)号：US20200321949A1

公开(公告)日：2020-10-08

申请号：US16817482

申请日：2020-03-12

Applicant: IONQ, INC.

Inventor： Shantanu DEBNATH ,  Jason M. AMINI ,  Jwo-Sy CHEN ,  Neal PISENTI

IPC: H03K3/38 ,  H03K19/195 ,  G06N10/00

Abstract: A method of performing a computational process using a quantum computer includes generating a laser pulse sequence comprising a plurality of laser pulse segments used to perform an entangling gate operation on a first trapped ion and a second trapped ion of a plurality of trapped ions that are aligned in a first direction, each of the trapped ions having two frequency-separated states defining a qubit, and applying the generated laser pulse sequence to the first and second trapped ions. Each of the plurality of laser pulse segments has a pulse shape with ramps formed using a spline at a start and an end of each of the plurality of laser pulse segments.

公开(公告)号：US20230222373A1

公开(公告)日：2023-07-13

申请号：US18181393

申请日：2023-03-09

Applicant: IonQ, Inc.

Inventor： Jwo-Sy CHEN ,  Neal Pisenti ,  Yunseong Nam

IPC: G06N10/20 ,  G06N10/40

CPC classification number: G06N10/20 ,  G06N10/40

Abstract: The disclosure describes various techniques to control of small angle Mølmer-Sørensen (MS) gates and to handle asymmetric errors. A technique is described that implements a two-qubit calibration circuit with two MS gates, where a parameter θ represents an amount of entanglement of the MS gate. The calibration circuit is run for several values of θ to measure observed parity signals that are direct measurements of the values of θ. Calibration information is generated that describes the relationship between θ and the parity signals, and such calibration information is then provided to arbitrarily calibrate one or more MS gates in a quantum simulation. Another technique is described for using the calibration information in quantum simulations, including for quantum chemistry simulations. Yet another technique is described for handling system-based asymmetric errors in the measurements of different qubit states in different types of quantum circuits, including, for example, the calibration circuit mentioned above.

公开(公告)号：US20220414512A1

公开(公告)日：2022-12-29

申请号：US17887003

申请日：2022-08-12

Applicant: IonQ, Inc.

Inventor： Jwo-Sy CHEN ,  Neal PISENTI ,  Yunseong NAM

IPC: G06N10/00 ,  G06F30/20 ,  G06F11/10

Abstract: The disclosure describes various techniques to control of small angle Mølmer-Sørensen (MS) gates and to handle asymmetric errors. A technique is described for handling asymmetric errors in quantum information processing (QIP) systems. An exemplary method includes implementing a quantum circuit in the QIP system that has first and second qubit lines, with a first qubit state having a greater measurement error than a second qubit state; swapping the roles of the first and second qubit states at a quantum circuit level in response to at least one of the first qubit line and the second qubit line being expected to be at the first qubit state at a measurement; and enabling a quantum simulation using the quantum circuit with the first and second qubit states reassigned in at least one of the first qubit line and the second qubit line after the swapping of the respective roles.

公开(公告)号：US20220120629A1

公开(公告)日：2022-04-21

申请号：US17072916

申请日：2020-10-16

Applicant: IonQ, Inc.

Inventor： Neal PISENTI ,  Kenneth WRIGHT ,  Jason Madjdi AMINI ,  Jwo-Sy CHEN

IPC: G01L21/30 ,  G06N10/00

Abstract: Aspects of the present disclosure describe techniques for measuring collision rate with spatial filtering of scattered light. For example, a method for characterizing vacuum in a chamber is described that includes generating, inside the chamber, a potential well having a single, shallow potential region within which an ion is trapped, the shallow potential region having a lowest potential of the potential well, optically monitoring the ion within the potential well, detecting, based on the optically monitoring, a movement of the ion away from the shallow potential region in response to a collision with a background gas, and determining a pressure inside the chamber based on a rate of detected movements of the ion.

公开(公告)号：US20200373917A1

公开(公告)日：2020-11-26

申请号：US16990108

申请日：2020-08-11

Applicant: IONQ, INC.

Inventor： Shantanu DEBNATH ,  Jason M. AMINI ,  Jwo-Sy CHEN ,  Neal PISENTI

IPC: H03K3/38 ,  G06N10/00 ,  H03K19/195

Abstract: A method of performing a computational process using a quantum computer includes generating a laser pulse sequence comprising a plurality of laser pulse segments used to perform an entangling gate operation on a first trapped ion and a second trapped ion of a plurality of trapped ions that are aligned in a first direction, each of the trapped ions having two frequency-separated states defining a qubit, and applying the generated laser pulse sequence to the first and second trapped ions. Each of the plurality of laser pulse segments has a pulse shape with ramps formed using a spline at a start and an end of each of the plurality of laser pulse segments.