Contactless screening of a qubit

Patent metadata

Field	Value
Publication number	US-11726109-B2
Application number	US-202017137009-A
Country	US
Kind code	B2
Filing date	Dec 29, 2020
Priority date	Nov 18, 2019
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

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 memory; and
a processor operably coupled to the memory, wherein the processor controls:
a scanner component that establishes a microwave coupling of a device to a qubit of a quantum device; and
a parameter extraction component that determines 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 scanner component couples the microwave resonator directly to the qubit using at least one of capacitive coupling or inductive coupling.

3. The system of claim 1 , further controlling the microwave resonator coupled to the device, wherein the parameter extraction component determines 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.

4. The system of claim 1 , wherein multiple scanning probe devices and the quantum device are located in a cryostat device, and 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 a parameter extraction component determines at least one of qubit frequencies or qubit energy relaxation times of the multiple qubits based on the multiple microwave couplings.

5. The system of claim 1 , further comprising:
a position component that positions the device a defined distance from the qubit to establish the microwave coupling of the device to the qubit.

6. The system of claim 1 , wherein the device and the quantum device are located in a cryostat device, and wherein the scanner component establishes inside the cryostat device the microwave coupling of the device to the qubit to inspect the qubit.

7. A computer-implemented method, comprising:
establishing, by a system operatively coupled to a processor, via a scanner component, 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;
coupling, by the system, a microwave resonator of the device directly to the qubit using at least one of capacitive coupling or inductive coupling, wherein the microwave resonator is comprised within the scanner component: and
determining, by the system, qubit energy relaxation time of the qubit based on the microwave coupling.

8. The computer-implemented method of claim 7 , 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.

9. The computer-implemented method of claim 7 , further comprising:
inserting, by the system, multiple devices and the quantum device into a cryostat device;
establishing, by the system, inside the cryostat device multiple microwave couplings of the multiple devices to multiple qubits of the quantum device; and
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.

10. The computer-implemented method of claim 7 , 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.

11. The computer-implemented method of claim 7 , 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.

12. 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, via a scanner component, 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;
couple, by the processor, a microwave resonator of the device directly to the qubit using at least one of capacitive coupling or inductive coupling, wherein the microwave resonator is comprised within the scanner component; and
determine, by the processor, qubit energy relaxation time of the qubit based on the microwave coupling.

13. The computer program product of claim 12 , 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.

14. The computer program product of claim 12 , 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.

15. The computer program product of claim 12 , wherein the program instructions are further executable by the processor to cause the processor to:
insert, by the processor, the device and the quantum device into a cryostat device; and
establish, by the processor, inside the cryostat device the microwave coupling of the device to the qubit to inspect the qubit.

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