# US 12,603,411 B2 · Reading device for superconducting qubit

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- Number: US 12,603,411 B2
- Document ID: US12603411B2
- Status: Granted
- Kind: B2
- Application number: 18/291,195
- Filed: 2021-07-23
- Published: 2024-10-03
- Granted: 2026-04-14
- Earliest claimed: 2021-07-23
- Assignees: University of Science and Technology of China
- Applicants: University Of Science And Technology Of China
- Inventors: Fengming Liu; Mingcheng Chen; Can Wang; Chaoyang Lu; Jianwei Pan
- Web page: https://patentgrep.com/patent/US12603411B2

## CPC

- H01P 7/06: Cavity resonators
- G06N 10/00: Quantum computing, i.e. information processing based on quantum-mechanical phenomena
- G06N 10/40: Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control
- H01P 5/08: for linking dissimilar lines or devices (H01P1/16, H01P5/04 take precedence; linking lines of the same kind but with different dimensions H01P5/02)
- H10N 60/12: Josephson-effect devices
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- G06N: COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR

## Abstract

The present disclosure provides a reading device for superconducting qubit, including a qubit, a reading cavity and a Josephson junction, where the qubit is coupled with the reading cavity through the Josephson junction.

## Claims

### Claim 1

A reading device for superconducting qubit, applied to dispersion measurement for the superconducting qubit, the reading device comprising: a qubit, a reading cavity and a Josephson junction, wherein the qubit is coupled with the reading cavity through the Josephson junction, wherein the qubit of the reading device and the reading cavity are coupled by ZZ coupling of the Josephson junction under respective independent energy eigenstate basis vectors, the reading cavity is a distributed transmission-line-type resonant cavity, a frequency of the transmission-line-type resonant cavity is changed by a state of the gubit, and a position of a connection point of the Josephson junction and the transmission-line-type resonant cavity and a characteristic impedance of a transmission line are determined according to a required coupling strength.

### Claim 2 (depends on 1)

The reading device of claim 1, wherein the qubit and the transmission-line-type resonant cavity are coupled by one Josephson junction.

### Claim 3 (depends on 1)

The reading device of claim 1, wherein the qubit and the transmission-line-type resonant cavity are connected by two or more Josephson junctions.

### Claim 4 (depends on 1)

The reading device of claim 1, wherein the qubit is coupled with the reading cavity by both the Josephson junction and a capacitor.

### Claim 5 (depends on 1)

The reading device of claim 1, wherein the qubit is a Transmon qubit or a Plasonium qubit.

### Claim 6 (depends on 1)

The reading device of claim 1, wherein the reading cavity is coupled to a reading line, and the reading cavity is coupled with the reading line by capacitive coupling or inductive coupling.

### Claim 7 (depends on 1)

The reading device of claim 1, further comprising an independent magnetic flux control line for controlling a magnetic flux in a loop where the Josephson junction for coupling is located.

### Claim 8 (depends on 1)

The reading device of claim 1, wherein a target value that a magnetic flux is controlled to reach is an integer number of magnetic flux quanta, wherein the magnetic flux is a magnetic flux in a loop where the Josephson junction for coupling is located.