Reduction and/or mitigation of crosstalk in quantum bit gates

Patent metadata

Field	Value
Publication number	US-10223643-B1
Application number	US-201715721194-A
Country	US
Kind code	B1
Filing date	Sep 29, 2017
Priority date	Sep 29, 2017
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

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 single pulse type for a first quantum bit and at least a second quantum bit of a quantum circuit; and
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, wherein the coordination component simultaneously applies the first pulse to the first quantum bit and at least the second pulse to at least the second quantum bit.

2. 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.

3. The system of claim 1 , wherein the coordination component calibrates the first pulse of the first quantum bit in a presence of at least the second pulse of at least the second quantum bit in the quantum circuit.

4. The system of claim 1 , wherein the coordination component implements an identity gate via active idling, wherein the active idling eliminates an absence of pulses for other quantum bits within the quantum circuit.

5. The system of claim 4 , wherein the coordination component implements the active idling with a random active idle sequence, and wherein the random active idle sequence facilitates a reduction of systematic errors within the quantum circuit.

6. The system of claim 1 , wherein the coordination component uses high-order echo/decoupling sequences for higher-order suppression based on an idle period being longer than a defined idle time.

7. The system of claim 1 , wherein a synchronization of the pulses facilitates continuous microwave pulsing.

8. The system of claim 7 , wherein the continuous microwave pulsing reduces crosstalk in one or more quantum bit gates of the quantum circuit.

9. The system of claim 7 , wherein the continuous microwave pulsing renders control crosstalk between the first quantum bit and at least the second quantum bit to be a similar crosstalk, and wherein the computer executable components further comprise a calibration component that selectively removes the control crosstalk from the quantum circuit.

10. The system of claim 9 , wherein the continuous microwave pulsing renders the control crosstalk as the similar crosstalk irrespective of a first state of the first quantum bit and a second state of at least the second quantum bit.

11. A computer-implemented method, comprising:
implementing, by a system operatively coupled to a processor, 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;
synchronizing, by the system, 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; and
simultaneously applying, by the system, the first pulse to the first quantum bit and the second pulse to at least the second quantum bit.

12. The computer-implemented method of claim 11 , 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 11 , further comprising:
calibrating, by the system, the first pulse of the first quantum bit in a presence of at least the second pulse of at least the second quantum bit in the quantum circuit.

14. The computer-implemented method of claim 11 , further comprising:
implementing an identity gate via active idling, wherein the active idling eliminates an absence of pulses for other quantum bits within the quantum circuit.

15. The computer-implemented method of claim 14 , further comprising:
implementing the active idling with a random active idle sequence, wherein the random active idle sequence facilitates a reduction of systematic errors within the quantum circuit.

16. The computer-implemented method of claim 11 , wherein the synchronizing the first pulse and at least the second pulse produces continuous microwave pulsing.

17. A computer program product that removes crosstalk in quantum bit gates, 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 single pulse type for a first quantum bit and at least a second quantum bit of a quantum circuit;
synchronize 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; and
simultaneously apply the first pulse to the first quantum bit and the second pulse to at least the second quantum bit.

18. The computer program product of claim 17 , wherein the program instructions cause the processor to:
calibrate the first pulse of the first quantum bit in a presence of at least the second pulse of at least the second quantum bit in the quantum circuit.

19. The computer program product of claim 17 , wherein the program instructions cause the processor to:
implement an identity gate via active idling, wherein the active idling eliminates an absence of pulses for other quantum bits within the quantum circuit.

20. The computer program product of claim 17 , wherein the program instructions cause the processor to:
produce continuous microwave pulsing based on a synchronization of the first pulse and at least the second pulse.

21. A system, comprising:
an electrical waveform generator that generates a single channel waveform to facilitate distribution to qubits of a quantum circuit;
one or more configurable amplitude scalers that scale the single channel to facilitate calibration of the qubits; and
one or more configurable phase-shifters that implement frame changes at the qubits, wherein a first configurable amplitude scaler of the one or more configurable amplitude scalers and a first configurable phase-shifter of the one or more configurable phase-shifters are utilized for a first qubit of the qubits, and wherein a second configurable amplitude scaler of the one or more configurable amplitude scalers and a second configurable phase-shifter of the one or more configurable phase-shifters are utilized for a second qubit of the qubits.

22. The system of claim 21 , wherein the waveform generator constructs a single pulse template from a Gaussian pulse.

23. The system of claim 21 , wherein the configurable phase-shifters implement frame changes from respective phase rotations of the qubits.

24. A system, comprising:
an arbitrary waveform generator that generates a two channel waveform to generate pulses for qubits of a quantum circuit;
configurable attenuators that scale the pulses to facilitate calibration of the qubits, wherein pairs of attenuators of the configurable attenuators are implemented at respective qubits of the qubits; and
configurable phase-shifters that implement frame changes at the qubits, wherein respective phase-shifters of the configurable phase

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

• G06N99/002 Primary

  Physics · mapped topic