Reduction and/or mitigation of crosstalk in quantum bit gates

Patent metadata

Field	Value
Publication number	US-10546244-B2
Application number	US-201916255454-A
Country	US
Kind code	B2
Filing date	Jan 23, 2019
Priority date	Sep 29, 2017
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

Techniques facilitating reduction and/or mitigation of crosstalk in quantum bit gates of a quantum computing circuit are provided. 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 signal generation component that implements a control sequence that comprises a single pulse type for a first quantum bit and at least a second quantum bit of a quantum circuit. The computer-executable components can also comprise a coordination component that synchronizes a first pulse of a first channel of the first quantum bit and at least a second pulse of at least a second channel of the second quantum bit. The coordination component can simultaneously apply the first pulse to the first quantum bit and at least the second pulse to at least the second quantum bit.

First claim

What is claimed is:

1. A system, comprising:
a memory that stores computer executable components; and
a processor that executes the computer executable components stored in the memory, wherein the computer executable components comprise:
a signal generation component that implements a control sequence that comprises a continuous microwave pulsing operation for a plurality of quantum bits of a quantum circuit that reduces crosstalk in the quantum circuit; and
a coordination component that synchronizes a plurality of pulses of the continuous microwave pulsing operation across a plurality of channels of the plurality of quantum bits.

2. The system of claim 1 , wherein the coordination component simultaneously applies the plurality of pulses to the plurality of quantum bits.

3. The system of claim 1 , wherein the continuous microwave pulsing renders the crosstalk between a first quantum bit of the plurality of quantum bits and at least a second quantum bit of the plurality of quantum bits to be a similar crosstalk.

4. The system of claim 1 , wherein the coordination component calibrates a first pulse of the pulses associated with a first quantum bit of the plurality of quantum bits in a presence of at least a second pulse of the pulses associated with at least a second quantum bit of the plurality of quantum bits to reduce the crosstalk.

5. The system of claim 1 , the computer executable components further comprise:
a control component that combines frame changes to the control sequence, wherein a combination of the control sequence and the frame changes implements a single quantum bit SU(2) gate control.

6. The system of claim 1 , wherein the control sequence further comprises a single pulse type for the plurality of pulses.

7. The system of claim 1 , wherein the single pulse type is a pi/2 rotation pulse type.

8. A computer-implemented method, comprising:
implementing, by a system operatively coupled to a processor, a control sequence that comprises a continuous microwave pulsing operation for a plurality of quantum bits of a quantum circuit that reduces crosstalk in the quantum circuit; and
synchronizing, by the system, a plurality of pulses of the continuous microwave pulsing operation across a plurality of channels of the plurality of quantum bits.

9. The computer-implemented method of claim 8 , further comprising simultaneously applying, by the system, the plurality of pulses to the plurality of quantum bits.

10. The computer-implemented method of claim 8 , further comprising rendering, by the system via the continuous microwave pulsing operation, the crosstalk between a first quantum bit of the plurality of quantum bits and at least a second quantum bit of the plurality of quantum bits to be a similar crosstalk.

11. The computer-implemented method of claim 8 , further comprising calibrating, by the system, a first pulse of the pulses associated with a first quantum bit of the plurality of quantum bits in a presence of at least a second pulse of the pulses associated with at least a second quantum bit of the plurality of quantum bits to reduce the crosstalk.

12. The computer-implemented method of claim 8 , further comprising combining, by the system, frame changes to the control sequence, wherein a combination of the control sequence and the frame changes implements a single quantum bit SU(2) gate control.

13. The computer-implemented method of claim 8 , further comprising applying, by the system via the continuous microwave pulsing operation, a single pulse type for the plurality of pulses.

14. The computer-implemented method of claim 8 , further comprising applying, by the system via the continuous microwave pulsing operation, a pi/2 rotation pulse type for the plurality of pulses.

15. A computer program product that removes crosstalk in a quantum circuit, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions are executable by a processor to cause the processor to:
implement a control sequence that comprises a continuous microwave pulsing operation for a plurality of quantum bits of the quantum circuit that reduces the crosstalk in the quantum circuit;
synchronize a plurality of pulses of the continuous microwave pulsing operation across a plurality of channels of the plurality of quantum bits.

16. The computer program product of claim 15 , wherein the program instructions further cause the processor to simultaneously apply the plurality of pulses to the plurality of quantum bits.

17. The computer program product of claim 15 , wherein the program instructions further cause the processor to render, via the continuous microwave pulsing operation, the crosstalk between a first quantum bit of the plurality of quantum bits and at least a second quantum bit of the plurality of quantum bits to be a similar crosstalk.

18. The computer program product of claim 15 , wherein the program instructions further cause the processor to calibrate a first pulse of the pulses associated with a first quantum bit of the plurality of quantum bits in a presence of at least a second pulse of the pulses associated with at least a second quantum bit of the plurality of quantum bits to reduce the crosstalk.

19. The computer program product of claim 15 , wherein the program instructions further cause the processor to combine frame changes to the control sequence, wherein a combination of the control sequence and the frame changes implements a single quantum bit SU(2) gate control.

20. The computer program product of claim 15 , wherein the program instructions further cause the processor to apply, via the continuous microwave pulsing operation, a single pulse type for the plurality of pulses.

21. A system, comprising:
a memory that stores computer executable components; and
a processor that executes the computer executable components stored in the memory, wherein the computer executable components comprise:
a signal generation component that implements a control sequence that comprises a first pulse type for a first quantum bit and a second pulse type for at least a second quantum bit of a quantum circuit; and
a control component that implements an active idling of the first quantum bit while the first quantum bit is in an idle mode.

22. The system of claim 21 , wherein the active idling is based on a combination of frame changes of the first pulse type and the second pulse type.

23. The system of claim 22 , wherein the active idling uses high-order echo/decoupling sequences for higher-order suppression based on an idle period of the idle mode being longer than a defined idle time.

24. A system, comprising:
a memory that stores computer executable components; and
a processor that executes the computer executable components stored in the memory, wherein the computer executable components comprise:
a signal generation component that implements a control sequence that comprises a first pulse type for a first quantum bit and a second pulse type for at least a second quantum bit of a quantum circuit; and
a control component that calibrates a first pulse for the first quantum bit and a second pulse for the at least the second quantum bit to selectively remove a crosstalk from the quantum circuit.

25. The system of claim 24 , wherein the control sequence renders the crosstalk between the first quantum bit and the at least the second quantum b

Assignees

• IBM

Inventors

• Bishop Lev Samuel
• Gambetta Jay

Classifications

• H04B14/02

  characterised by the use of pulse modulation (in radio transmission relays H04B7/17) · CPC title

• H04B3/32

  Reducing cross-talk, e.g. by compensating · CPC title

• H03K3/013

  Modifications of generator to prevent operation by noise or interference · CPC title

• H03K3/38

  by the use, as active elements, of superconductive devices · CPC title

• G06N10/00 Primary

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