# US 12,217,134 B2 · Quantum charge-coupled device

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- Number: US 12,217,134 B2
- Document ID: US12217134B2
- Status: Granted
- Kind: B2
- Application number: 17/993,887
- Filed: 2022-11-24
- Published: 2023-06-01
- Granted: 2025-02-04
- Earliest claimed: 2021-11-29
- Assignees: National Taiwan University
- Applicants: National Taiwan University
- Inventors: Guin-Dar Lin; Wen-Han Png
- Web page: https://patentgrep.com/patent/US12217134B2

## CPC

- G06N 10/40: Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control
- G06N: COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS

## Abstract

A quantum charge-coupled device including a first ion, a second ion, a fixed ion trap, an adjustable ion trap, and an excitation light source is provided. The fixed ion trap is configured to stationarily trap the first ion. The adjustable ion trap works as an ion rail disposed beside the fixed ion trap, wherein the ion rail is configured to make the second ion move at a constant velocity along the ion rail. The excitation light source is configured to irradiate an incident light beam. The incident light beam includes a series of light pulses and covers the first ion and the second ion when a distance between them becomes less than or equal to a proximity range, such that a quantum entangled state is directly built between the first ion and the second ion in uniform motion.

## Claims

### Claim 1

A quantum charge-coupled device, comprising:
a first ion;
a second ion;
a fixed ion trap, configured to stationarily trap the first ion;
an adjustable ion trap, working as an ion rail disposed beside the fixed ion trap and configured to make the second ion move at a constant velocity along the ion rail; and
an excitation light source, configured to irradiate an incident light beam, wherein the incident light beam comprises a series of light pulses and covers the first ion and the second ion when a distance between them becomes less than or equal to a proximity range, such that a quantum entangled state is directly built between the first ion and the second ion in uniform motion.

### Claim 2 (depends on 1)

The quantum charge-coupled device according to claim 1, wherein the adjustable ion trap is a linear rail.

### Claim 3 (depends on 1)

The quantum charge-coupled device according to claim 1, wherein the proximity range falls within a range of 10 micrometers to 20 micrometers.

### Claim 4 (depends on 1)

The quantum charge-coupled device according to claim 1, wherein the incident light beam is irradiated toward a position of the adjustable ion trap when the second ion is passing by the first ion.

### Claim 5 (depends on 1)

The quantum charge-coupled device according to claim 1, further comprising:
an beam splitter, disposed between the excitation light source and the fixed ion trap or disposed between the excitation light source and the adjustable ion trap, wherein the beam splitter divides the incident light beam into a first incident light beam and a second incident light beam, the first incident light beam is irradiated toward the first ion, and the second incident light beam is irradiated toward a position of the adjustable ion trap that is closest to the first ion.

### Claim 6 (depends on 1)

The quantum charge-coupled device according to claim 1, wherein the excitation light source comprises:
a first sub-excitation light source, configured to emit a first incident light beam toward the first ion; and
a second sub-excitation light source, configured to emit a second incident light beam toward a position of the adjustable ion trap that is closest to the first ion,
wherein the first incident light beam and the second incident light beam are phase-locked.

### Claim 7 (depends on 6)

The quantum charge-coupled device according to claim 6, wherein the excitation light source is a resonant short-pulsed laser.

### Claim 8 (depends on 1)

The quantum charge-coupled device according to claim 1, wherein the first ion comprises a plurality of sub-ions, the fixed ion trap comprises a plurality of sub-fixed ion traps, and the sub-fixed ion traps stationarily trap the sub-ions, respectively,
wherein when a distance between each of the sub-ions and the second ion is less than or equal to the proximity range, the incident light beam is irradiated on each of the sub-ions and the second ion, enabling quantum logic operations to be realized between each of the sub-ions and the second ion.

### Claim 9 (depends on 8)

The quantum charge-coupled device according to claim 8, wherein the sub-fixed ion traps are linear ion traps or ion trap arrays, and the adjustable ion trap is a linear rail.

### Claim 10 (depends on 8)

The quantum charge-coupled device according to claim 8, wherein the sub-fixed ion traps are linear ion traps or ion trap arrays, and the adjustable ion trap is a circular rail.

### Claim 11 (depends on 8)

The quantum charge-coupled device according to claim 8, wherein the sub-fixed ion traps are fixed linear ion traps or ion trap arrays, the adjustable ion trap comprises a plurality of sub-adjustable ion traps, and the sub-adjustable ion traps comprise linear rails and curved rails.