Strategic pausing for quantum state leakage mitigation

Patent metadata

Field	Value
Publication number	US-11960970-B2
Application number	US-202017096170-A
Country	US
Kind code	B2
Filing date	Nov 12, 2020
Priority date	Nov 12, 2020
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Systems and techniques that facilitate strategic pausing for quantum state leakage mitigation are provided. In various embodiments, a system can comprise a detection component that can detect a quantum state leakage associated with one or more qubits. In various aspects, the system can further comprise a pause component that can, in response to detecting the quantum state leakage, generate a time pause prior to execution of a quantum circuit on the one or more qubits. In various embodiments, the pause component can generate the time pause after execution of a previous quantum circuit on the one or more qubits, where the quantum state leakage arises during the execution of the previous quantum circuit. In some cases, the quantum state leakage can decay during the time pause.

First claim

What is claimed is:

1. A system, comprising:
a processor that executes computer-executable components stored in a computer-readable memory, the computer-executable components comprising:
a detection component that detects a quantum state leakage associated with one or more qubits;
a pause component that, in response to detecting the quantum state leakage, generates a time pause prior to execution of a quantum circuit on the one or more qubits;
wherein the detection component performs one or more quantum state measurements on the one or more qubits during the time pause, wherein the one or more quantum state measurements binarily distinguish between a ground state and excited states; and
an execution component that initiates, during the time pause, execution of the quantum circuit on the one or more qubits in response to the one or more quantum state measurements indicating that the one or more qubits are in the ground state.

2. The system of claim 1 , wherein the pause component generates the time pause after execution of a previous quantum circuit on the one or more qubits, wherein the quantum state leakage arises during the execution of the previous quantum circuit, and wherein the quantum state leakage decays during the time pause.

3. The system of claim 1 , wherein the one or more quantum state measurements further distinguish between different levels of the excited states, having a first excited state at a lowest level of the different levels.

4. The system of claim 3 , wherein the execution component initiates, during the time pause, the execution of the quantum circuit on the one or more qubits in response to the one or more quantum state measurements indicating that the one or more qubits are in at least one of the ground state or the first excited state.

5. The system of claim 1 , wherein the pause component varies a duration of the time pause based on a maximum excited state detected by the detection component.

6. The system of claim 1 , wherein a duration of the time pause is greater than a coherence time of the one or more qubits.

7. The system of claim 6 , wherein the duration of the time pause is of a same order of magnitude as the coherence time of the one or more qubits.

8. A computer-implemented method, comprising:
detecting, by a device operatively coupled to a processor, a quantum state leakage associated with one or more qubits;
generating, by the device and in response to detecting the quantum state leakage, a time pause prior to execution of a quantum circuit on the one or more qubits;
performing, by the device, one or more quantum state measurements on the one or more qubits during the time pause, wherein the one or more quantum state measurements binarily distinguish between a ground state and excited states; and
initiating, by the device, during the time pause, execution of the quantum circuit on the one or more qubits in response to the one or more quantum state measurements indicating that the one or more qubits are in the ground state.

9. The computer-implemented method of claim 8 , wherein the generating the time pause occurs after execution of a previous quantum circuit on the one or more qubits, wherein the quantum state leakage arises during the execution of the previous quantum circuit, and wherein the quantum state leakage decays during the time pause.

10. The computer-implemented method of claim 8 , wherein the one or more quantum state measurements further distinguish between different levels of the excited states, having a first excited state at a lowest level of the different levels.

11. The computer-implemented method of claim 10 , wherein the initiating comprises initiating, during the time pause, the execution of the quantum circuit on the one or more qubits in response to the one or more quantum state measurements indicating that the one or more qubits are in at least one of the ground state or the first excited state.

12. The computer-implemented method of claim 8 , further comprising:
varying, by the device, a duration of the time pause based on a maximum excited state detected during the detecting.

13. The computer-implemented method of claim 8 , wherein a duration of the time pause is greater than a coherence time of the one or more qubits.

14. The computer-implemented method of claim 13 , wherein the duration of the time pause is of a same order of magnitude as the coherence time of the one or more qubits.

15. A computer program product for facilitating strategic pausing for quantum state leakage mitigation, the computer program product comprising a computer-readable memory having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to:
detect, by the processor, a quantum state leakage associated with one or more qubits; and
generate, by the processor and in response to detecting the quantum state leakage, a time pause prior to execution of a quantum circuit on the one or more qubits;
perform, by the processor, one or more quantum state measurements on the one or more qubits during the time pause, wherein the one or more quantum state measurements binarily distinguish between a ground state and excited states; and
initiate, by the processor, during the time pause, execution the quantum circuit on the one or more qubits in response to the one or more quantum state measurements indicating that the one or more qubits are in the ground state.

16. The computer program product of claim 15 , wherein the processor generates the time pause after execution of a previous quantum circuit on the one or more qubits, wherein the quantum state leakage arises during the execution of the previous quantum circuit, and wherein the quantum state leakage decays during the time pause.

17. The computer program product of claim 15 , wherein the the one or more quantum state measurements further distinguish between different levels of the excited states, having a first excited state at a lowest level of the different levels.

18. The computer program product of claim 17 , wherein the program instructions are further executable to cause the processor to:
initiate, by the processor, during the time pause, the execution of the quantum circuit on the one or more qubits in response to the one or more quantum state measurements indicating that the one or more qubits are in at least one of the ground state or the first excited state.

19. The computer program product of claim 15 , wherein the program instructions are further executable to cause the processor to:
vary, by the processor, a duration of the time pause based on a maximum excited state detected by the processor.

20. The computer program product of claim 15 , wherein a duration of the time pause is greater than a coherence time of the one or more qubits, and wherein the duration of the time pause is of a same order of magnitude as the coherence time of the one or more qubits.

Assignees

• IBM

Inventors

• Dial Oliver
• Corcoles-Gonzalez Antonio
• Takita Maika
• Mckay David C

Classifications

• G06N10/00 Primary

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

• G01R31/52

  Testing for short-circuits, leakage current or ground faults · CPC title

• G06N10/70 Primary

  Quantum error correction, detection or prevention, e.g. surface codes or magic state distillation · CPC title