# US 11,994,666 B2 · Optical beam angle and position control system

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- Number: US 11,994,666 B2
- Document ID: US11994666B2
- Status: Granted
- Kind: B2
- Application number: 17/374,127
- Filed: 2021-07-13
- Published: 2022-05-05
- Granted: 2024-05-28
- Earliest claimed: 2020-07-14
- Assignees: IonQ, Inc.; Duke University
- Applicants: IonQ, Inc.; Duke University
- Inventors: Jungsang Kim; Kai Hudek; Jaime David Wong-Campos
- Web page: https://patentgrep.com/patent/US11994666B2

## CPC

- G02B 23/12: with means for image conversion or intensification
- G06N 10/40: Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control
- G02B 23/02: involving prisms or mirrors (G02B23/14 takes precedence)
- G02B 26/105: {with one or more pivoting mirrors or galvano-mirrors (G02B26/101 takes precedence)}
- G06N 10/00: Quantum computing, i.e. information processing based on quantum-mechanical phenomena
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G06N: COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS

## Abstract

Aspects of the present disclosure describe techniques for independently controlling an angle (e.g., change in tilt) and/or position (e.g., change in lateral position) of an optical beam. For example, an optical beam control system may include a telescope with rotatable mirrors and lenses configured to provide a path to an optical beam to produce an output optical beam, which in turn is made into parallel optical beams following a diffractive optical element. The optical beam control system may also include a detector system to a beam angle and/or a beam position of one of the parallel optical beams to generate feedback signal or signals to control a rotation of one or more of the mirrors in the telescope such as to adjust the beam angle, the beam position, or both of the parallel optical beams. The optical beam control system may be part of a quantum information processing (QIP) system.

## Claims

### Claim 1

An optical beam control system, comprising:
a telescope having multiple rotatable mirrors and multiple lenses collectively configured to provide a path to an optical beam that is input into the telescope to produce an output optical beam, the output optical beam being made into parallel optical beams following a diffractive optical element; and
a detector system configured to detect a beam angle, a beam position, or both associated with one of the parallel optical beams being sampled to generate one or more feedback signals to control a rotation of one or more of the rotatable mirrors in the telescope to modify the path and thereby the output optical beam such as to adjust the beam angle, the beam position, or both of the parallel optical beams;
wherein the parallel optical beams are provided to a multi-channel acousto-optic modulator (AOM) in a quantum information processing (QIP) system, the AOM being configured to adjust one or more of the parallel optical beams to control respective atomic qubits in the QIP system.

### Claim 2 (depends on 1)

The optical beam control system of claim 1, wherein the one or more feedback signals include a first feedback signal to control one of the rotatable mirrors to adjust the beam angle and a second feedback signal to control another one of the rotatable mirrors to adjust the beam position, wherein the adjustment of the beam angle is independent or orthogonal from the adjustment of the beam position.

### Claim 3 (depends on 1)

The optical beam control system of claim 1, wherein the detector system includes a first sensor configured to detect the beam angle of the one parallel optical beam, and a second sensor configured to detect the beam position of the one parallel optical beam.

### Claim 4 (depends on 3)

The optical beam control system of claim 3, wherein the detector system includes multiple mirrors and multiple lenses collectively configured to direct the one parallel optical beam to the first sensor to detect the beam angle and to the second sensor to detect the beam position.

### Claim 5 (depends on 3)

The optical beam control system of claim 3, wherein the detector system further comprises a controller configured to receive and process information from the first sensor, the second sensor, or both, to generate the feedback signal.

### Claim 6 (depends on 1)

The optical beam control system of claim 1, wherein the rotatable mirrors include a first mirror configured to change a beam angle of the output optical beam incident on an imaging point of the telescope that coincides with the diffractive optical element, wherein the change of the beam angle corresponds to a lateral shift in the beam position of the one parallel optical beam.

### Claim 7 (depends on 1)

The optical beam control system of claim 1, wherein the rotatable mirrors include a second mirror configured to change the beam angle of the parallel optical beams.

### Claim 8 (depends on 1)

The optical beam control system of claim 1, wherein the path includes a first mirror, a first lens having a first focal length, a second mirror, and a second lens having a second focal length, the first mirror and the second mirror being positioned the first focal length away from the first lens, and the second mirror and the diffractive optical element being positioned the second focal length away from the second lens.

### Claim 9 (depends on 1)

The optical beam control system of claim 1, wherein the one parallel optical beam is received by the detector system after passing through a respective channel in the multi-channel AOM.

### Claim 10 (depends on 1)

The optical beam control system of claim 1, wherein the telescope includes a piezo mirror mount for each of the rotatable mirrors, each piezo mirror mount being configured to receive a corresponding portion of the feedback signal to control the rotation of the respective rotatable mirror.

### Claim 11

A quantum information processing (QIP) system for controlling quantum states of ions in an ion chain for quantum operations, comprising:
a trap configured to implement the ion chain;
a multi-channel acousto-optic modulator (AOM) configured to receive multiple parallel optical beams and modify one or more of the parallel optical beams for controlling respective ions in the ion chain;
a telescope having multiple rotatable mirrors and multiple lenses collectively configured to provide a path to an optical beam that is input into the telescope to produce an output optical beam, the output optical beam being made into the parallel optical beams following a diffractive optical element; and
a detector system configured to detect a beam angle, a beam position, or both associated with one of the parallel optical beams being sampled to generate one or more feedback signals to control a rotation of one or more of the rotatable mirrors in the telescope to modify the path and thereby the output optical beam such as to adjust the beam angle, the beam position, or both of the parallel optical beams at the multi-channel AOM;
wherein the parallel optical beams are provided to the AOM in the QIP system, the AOM being configured to adjust one or more of the parallel optical beams to control respective atomic qubits in the QIP system.

### Claim 12 (depends on 11)

The QIP system of claim 11, wherein the one or more feedback signals include a first feedback signal to control one of the rotatable mirrors to adjust the beam angle and a second feedback signal to control another one of the rotatable mirrors to adjust the beam position, wherein the adjustment of the beam angle is independent or orthogonal from the adjustment of the beam position.

### Claim 13 (depends on 11)

The QIP system of claim 11, wherein the detector system includes a first sensor configured to detect the beam angle of the one parallel optical beam, and a second sensor configured to detect the beam position of the one parallel optical beam.

### Claim 14 (depends on 11)

The QIP system of claim 11, wherein the detector system includes multiple mirrors and multiple lenses collectively configured to direct the one parallel optical beam to the first sensor to detect the beam angle and to the second sensor to detect the beam position.

### Claim 15 (depends on 11)

The QIP system of claim 11, wherein the detector system further comprises a controller configured to receive and process information from the first sensor, the second sensor, or both, to generate the feedback signal.

### Claim 16 (depends on 11)

The QIP system of claim 11, wherein the rotatable mirrors include a first mirror configured to change a beam angle of the output optical beam incident on an imaging point of the telescope that coincides with the diffractive optical element, wherein the change of the beam angle corresponds to a lateral shift in the beam position of the one parallel optical beam, and the rotatable mirrors include a second mirror configured to change the beam angle of the parallel optical beams at the multi-channel AOM.

### Claim 17

A method for controlling, by an optical beam control system, an optical beam in a quantum information processing (QIP) system, the optical beam control system having a telescope with multiple rotatable mirrors and multiple lenses, a diffractive optical lens, a zoom lens, a detector system having a first sensor and a second sensor, and a multi-channel acousto-optic modulator (AOM), the method comprising:
receiving, at the telescope, an optical beam;
producing from the optical beam, by a path collectively provided by the multiple rotatable mirrors and multiple lenses in the telescope, an output optical beam;
generating from the output optical, by the diffractive optical element and the zoom lens, parallel optical beams;
providing the parallel optical beams to the multi-channel AOM;
detecting, from one of the parallel optical beams passing through the multi-channel AOM, a beam angle by the first sensor and a beam position by the second sensor; and
generating, from information provided by the first sensor and the second sensor, one or more feedback signals to control a rotation of one or more of the rotatable mirrors in the telescope to modify the path and thereby the output optical beam such as to adjust the beam angle, the beam position, or both of the parallel optical beams at the multi-channel AOM;
wherein providing the parallel optical beams comprises adjusting one or more of the parallel optical beams to control respective atomic qubits in the QIP system.

### Claim 18 (depends on 17)

The method of claim 17, wherein generating the one or more feedback signals includes generating a first feedback signal to control one of the rotatable mirrors to adjust the beam angle and generating a second feedback signal to control another one of the rotatable mirrors to adjust the beam position, wherein the adjustment of the beam angle is independent or orthogonal from the adjustment of the beam position.

### Claim 19 (depends on 17)

The method of claim 17, wherein the telescope includes a piezo mirror mount for each of the rotatable mirrors, the method further comprising receiving at each piezo mirror mount a corresponding portion of the feedback signal to control the rotation of the respective rotatable mirror.