Contactless screening of a qubit

Patent metadata

Field	Value
Publication number	US-2023333138-A1
Application number	US-202318339705-A
Country	US
Kind code	A1
Filing date	Jun 22, 2023
Priority date	Nov 18, 2019
Publication date	Oct 19, 2023
Grant date	—

Abstract

Systems, devices, computer-implemented methods, and computer program products to facilitate contactless screening of a qubit are provided. According to an embodiment, a system can comprise a memory that stores computer executable components and a processor that executes the computer executable components stored in the memory. The computer executable components can comprise a scanner component that establishes a direct microwave coupling of a scanning probe device to a qubit of a quantum device. The computer executable components can further comprise a parameter extraction component that determines qubit frequency of the qubit based on the direct microwave coupling.

First claim

What is claimed is:

1 . A system, comprising:
a processor that executes computer-executable components stored in a non-transitory computer-readable memory to perform:
establishing a microwave coupling of a device to a qubit of a quantum device; and
determining qubit frequency of the qubit based on the microwave coupling and qubit energy relaxation time of the qubit based on the microwave coupling, wherein the processor further controls a microwave resonator comprised within the scanner component and coupled to the device.

2 . The system of claim 1 , wherein the processor further executes computer-executable components stored in a non-transitory computer-readable memory to perform:
coupling the microwave resonator directly to the qubit using capacitive coupling.

3 . The system of claim 1 , wherein the processor further executes computer-executable components stored in a non-transitory computer-readable memory to perform:
coupling the microwave resonator directly to the qubit using inductive coupling.

4 . The system of claim 1 , wherein the processor further executes computer-executable components stored in a non-transitory computer-readable memory to perform:
further controlling the microwave resonator coupled to the device, wherein the determining at least one of the qubit frequency or the qubit energy relaxation time of the qubit is based on a state dependent frequency shift of the microwave resonator.

5 . The system of claim 1 , wherein multiple scanning probe devices and the quantum device are located in a cryostat device.

6 . The system of claim 5 , wherein the processor establishes inside the cryostat device multiple microwave couplings of the multiple scanning probe devices to multiple qubits of the quantum device and the determining at least one of qubit frequencies or qubit energy relaxation times of the multiple qubits is based on the multiple microwave couplings.

7 . The system of claim 1 , wherein the processor further executes computer-executable components stored in a non-transitory computer-readable memory to perform:
positioning the device a defined distance from the qubit to establish the microwave coupling of the device to the qubit.

8 . The system of claim 1 , wherein the device and the quantum device are located in a cryostat device, and wherein the processor further executes the computer-executable components to perform establishing inside the cryostat device the microwave coupling of the device to the qubit to inspect the qubit.

9 . A computer-implemented method, comprising:
establishing, by a system operatively coupled to a processor, a microwave coupling of a device to a qubit of a quantum device; determining, by the system, qubit frequency of the qubit based on the microwave coupling; and determining, by the system, qubit energy relaxation time of the qubit based on the microwave coupling.

10 . The computer-implemented method of claim 9 , further comprising:
determining, by the system, at least one of the qubit frequency or qubit energy relaxation time of the qubit based on a state dependent frequency shift of the microwave resonator of the device.

11 . The computer-implemented method of claim 9 , further comprising:
inserting, by the system, multiple devices and the quantum device into a cryostat device.

12 . The computer-implemented method of claim 11 , further comprising:
establishing, by the system, inside the cryostat device multiple microwave couplings of the multiple devices to multiple qubits of the quantum device.

13 . The computer-implemented method of claim 12 , further comprising:
determining, by the system, at least one of qubit frequencies or qubit energy relaxation times of the multiple qubits based on the multiple microwave couplings.

14 . The computer-implemented method of claim 9 , further comprising:
positioning, by the system, the device a defined distance from the qubit to establish the microwave coupling of the device to the qubit.

15 . The computer-implemented method of claim 9 , further comprising:
inserting, by the system, the device and the quantum device into a cryostat device; and establishing, by the system, inside the cryostat device the microwave coupling of the device to the qubit to inspect the qubit, thereby facilitating reduced time to extract the qubit frequency.

16 . A computer program product facilitating a contactless screening of a qubit process, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to:
establish, by the processor, a microwave coupling of a device to a qubit of a quantum device; determine, by the processor, qubit frequency of the qubit based on the microwave coupling; and determine, by the processor, qubit energy relaxation time of the qubit based on the microwave coupling.

17 . The computer program product of claim 16 , wherein the program instructions are further executable by the processor to cause the processor to:
couple, by the processor, a microwave resonator of the device directly to the qubit using capacitive coupling.

18 . The computer program product of claim 16 , wherein the program instructions are further executable by the processor to cause the processor to:
couple, by the processor, a microwave resonator of the device directly to the qubit using inductive coupling.

19 . The computer program product of claim 16 , wherein the program instructions are further executable by the processor to cause the processor to:
determine, by the processor, at least one of the qubit frequency or qubit energy relaxation time of the qubit based on a state dependent frequency shift of the microwave resonator of the device.

20 . The computer program product of claim 16 , wherein the program instructions are further executable by the processor to cause the processor to:
insert, by the processor, multiple devices and the quantum device into a cryostat device; establish, by the processor, inside the cryostat device multiple microwave couplings of the multiple devices to multiple qubits of the quantum device; and determine, by the processor, at least one of qubit frequencies or qubit energy relaxation times of the multiple qubits based on the multiple microwave couplings.

Assignees

• IBM

Inventors

• Sandberg Martin O
• Adiga Vivekananda P
• Paik Hanhee
• Hertzberg Jared Barney

Classifications

• G01Q30/10 Primary

  Thermal environment · CPC title

• G01Q60/00 Primary

  Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof · CPC title

• G06N10/00

  Quantum computing, i.e. information processing based on quantum-mechanical phenomena · CPC title