Quantum controller with multiple pulse modes

• US 10,454,459 B1
• Filed: 01/14/2019
• Issued: 10/22/2019
• Est. Priority Date: 01/14/2019
• Status: Active Grant

• Current Assignee: Quantum Machines
• Original Assignee: Quantum Machines
• Inventors: Cohen, Yonatan, Ofek, Nissim, Sivan, Itamar
• Primary Examiner(s): Chang, Daniel D
• Application Number:
  US16/247,115
• Time in Patent Office: 281 Days
• Field of Search: 326 1
• CPC Class Codes: G06N 10/00 Quantum computing, i.e. information processing based on quantum-mechanical phenomena
• CPC Class Codes: G06N 10/40 Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control
• CPC Class Codes: H03K 19/195 using superconductive devices
• CPC Class Codes: H03K 3/38 by the use, as active elements, of superconductive devices

Abstract

A quantum controller comprises a first outbound quantum control pulse generation circuit, a second outbound quantum control pulse generation circuit, and an outbound quantum control pulse modification circuit. The first outbound quantum control pulse generation circuit is operable to generate a first raw outbound quantum control pulse. The second outbound quantum control pulse generation circuit operable to generate a second raw outbound quantum control pulse. The outbound quantum control pulse modification circuit is operable to dynamically determine whether to process the first raw outbound quantum control pulse and the second outbound quantum control pulse as a multi-pulse pair or as two independent pulses. The determination of may be based on to which one or more quantum elements and/or signal paths the first raw outbound quantum control pulse and the second raw outbound quantum control pulse are to be routed.

Claims

1. A system comprising:

a quantum controller comprising a first raw outbound quantum control pulse generation circuit, a second raw outbound quantum control pulse generation circuit, and an outbound quantum control pulse modification circuit, wherein;

the first raw outbound quantum control pulse generation circuit is operable to generate a first raw outbound quantum control pulse;

the second raw outbound quantum control pulse generation circuit is operable to generate a second raw outbound quantum control pulse;

the outbound quantum control pulse modification circuit is operable to;

dynamically determine whether to process the first raw outbound quantum control pulse and the second raw outbound quantum control pulse as a multi-pulse pair to be mixed together or as two independent pulses; and

process the first raw outbound quantum control pulse and/or the second raw outbound quantum control pulse as determined.

2. The system of claim 1, wherein the dynamic determination of whether to process the first raw outbound quantum control pulse and the second raw outbound quantum control pulse as a multi-pulse pair or as two independent pulses is based on to which one or more signal paths and/or quantum elements the first raw outbound quantum control pulse and the second raw outbound quantum control pulse are to be routed.

3. The system of claim 1, wherein the outbound quantum control pulse modification circuit is operable to, when the first raw outbound quantum control pulse and the second raw outbound quantum control pulse are to be processed as a multi-pulse pair:

determine a N by N matrix representation of the one or more signal paths and/or quantum elements to which a generated outbound quantum control pulse is to be output, where N is an integer; and

mix the multi-pulse pair using the N by N matrix and a N by 1 matrix representation of the first raw outbound quantum control pulse and the second raw outbound quantum control pulse.

4. The system of claim 1, wherein:

the first raw outbound quantum control pulse generation circuit comprises pulse memory configured to store pulse templates comprising one or more samples; and

the generation of the first raw outbound quantum control pulse comprises;

a retrieval of one of the pulse templates from the pulse memory; and

a manipulation of the one or more samples of the pulse templates.

5. The system of claim 1, wherein the outbound quantum control pulse modification circuit is:

operable to store a plurality of pulse modification settings; and

dynamically configurable such that which of the plurality of pulse modification settings is applied to the first raw outbound quantum control pulse, and which of the plurality of pulse modification settings is applied to the second raw outbound quantum control pulse, is selectable during execution of instructions of a quantum computing algorithm by the quantum controller.

6. The system of claim 5, wherein each pulse modification setting of the plurality of pulse modification settings is configured for use with a respective one of a plurality of signal paths onto which the first raw outbound quantum control pulse and/or the second raw outbound quantum control pulse can be routed.

7. The system of claim 5, wherein each pulse modification setting of the plurality of pulse modification settings is configured for use with a respective one or more of a plurality of quantum elements to which the first raw outbound quantum control pulse and/or the second raw outbound quantum control pulse can be routed.

8. The system of claim 6, wherein each pulse modification setting of the plurality of pulse modification settings is a N by N matrix of complex and/or real numbers.

9. The system of claim 1, wherein the outbound quantum control pulse modification circuit is operable to:

in instances that the first raw outbound quantum control pulse and the second raw outbound quantum control pulse are to be processed as two independent pulses;

process the first raw outbound quantum control pulse using a first pulse modification setting for use with a first signal path; and

process the second raw outbound quantum control pulse using a second pulse modification setting for use with a second signal path; and

in instances that the first raw outbound quantum control pulse and the second raw outbound quantum control pulse are to be processed as a multi-pulse pair to be mixed together;

process the first raw outbound quantum control pulse and the second raw outbound quantum control pulse using a third pulse modification setting for use with a third one or more signal paths.

10. The system of claim 1, wherein the outbound quantum control pulse modification circuit is operable to:

in instances that the first raw outbound quantum control pulse and the second raw outbound quantum control pulse are to be processed as two independent pulses;

process the first raw outbound quantum control pulse using a first pulse modification setting to perform frequency, phase and/or amplitude modulation corresponding to a first quantum element or quantum transition; and

process the second raw outbound quantum control pulse using a second pulse modification setting to perform frequency, phase and/or amplitude modulation corresponding to a second quantum element or quantum transition; and

in instances that the first raw outbound quantum control pulse and the second raw outbound quantum control pulse are to be processed as a multi-pulse pair to be mixed together;

process the first raw outbound quantum control pulse and the second raw outbound quantum control pulse using a third pulse modification setting to perform frequency modulation, phase modulation, frame-of-reference rotation, and/or a linear transformation on a vector representation of the first raw outbound quantum control pulse and the second raw outbound quantum control pulse.

11. The system of claim 1, wherein the dynamic determination of whether to process the first raw outbound quantum control pulse and the second raw outbound quantum control pulse as a multi-pulse set to be mixed together or as two independent pulses is based on real-time calculations performed by the first raw outbound quantum control pulse generation circuit and/or the second raw outbound quantum control pulse generation circuit.

12. The system of claim 11, wherein the real-time calculations are based on feedback from a quantum element coupled to the quantum controller.

13. The system of claim 1, comprising output manager circuitry operable to:

in instances that the first raw outbound quantum control pulse and the second raw outbound quantum control pulse are to be processed as two independent pulses;

route a first outbound quantum control pulse generated from the first raw outbound quantum control pulse onto a first signal path; and

route a second outbound quantum control pulse generated from the second raw outbound quantum control pulse onto a second signal path; and

in instances that the first raw outbound quantum control pulse and the second raw outbound quantum control pulse are to be processed as a multi-pulse pair to be mixed together;

route a first outbound quantum control pulse generated from the first raw outbound quantum control pulse and the second raw outbound quantum control pulse onto a third signal path; and

route a second outbound quantum control pulse generated from the first raw outbound quantum control pulse and the second raw outbound quantum control pulse onto a fourth signal path.

14. A system comprising:

a quantum controller comprising a first raw outbound quantum control pulse generation circuit, a second raw outbound quantum control pulse generation circuit, and an outbound quantum control pulse modification circuit, wherein;

the first raw outbound quantum control pulse generation circuit is operable to generate a first raw outbound quantum control pulse; and

generate a second raw outbound quantum control pulse;

the second raw outbound quantum control pulse generation circuit is operable to generate a third raw outbound quantum control pulse;

generate a fourth raw outbound quantum control pulse;

the outbound quantum control pulse modification circuit is operable to;

dynamically determine to process the first raw outbound quantum control pulse and the third raw outbound quantum control pulse as a multi-pulse pair to be mixed together;

dynamically determine to process the second raw outbound quantum control pulse and the fourth raw outbound quantum control pulse as two independent pulses; and

process the first, second, third, and fourth raw outbound quantum pulses as determined to generate first, second, third, and fourth outbound quantum control pulses.

15. The system of claim 14, comprising output manager circuitry operable to:

route the first outbound quantum control pulse to a first signal path;

route the second outbound quantum control pulse onto a second signal path;

route the third outbound quantum control pulse onto a third signal path; and

route the fourth outbound quantum control pulse onto a fourth signal path.

16. The system of claim 14, comprising output manager circuitry operable to:

route the first outbound quantum control pulse to a first quantum element;

route the second outbound quantum control pulse onto a second quantum element;

route the third outbound quantum control pulse onto a third quantum element; and

route the fourth outbound quantum control pulse onto a fourth quantum element.

17. The system of claim 14, wherein:

the determination to process the second raw outbound quantum control pulse and the fourth raw outbound quantum control pulse as two independent pulses is based on characteristics of a first one or more quantum elements for which the second outbound quantum control pulse and fourth outbound quantum control pulse are intended; and

the determination to process the first raw outbound quantum control pulse and the third raw outbound quantum control pulse as a multi-pulse pair is based on characteristics of a second one or more quantum elements for which the first outbound quantum control pulse and third outbound quantum control pulse are intended.

18. The system of claim 14, wherein:

the outbound quantum control pulse modification circuit is operable to;

store first pulse modification settings configured for a first signal path and/or first quantum element;

apply the first pulse modification settings to the first raw outbound quantum control pulse;

store second pulse modification settings configured for a second signal path and/or second quantum element;

apply the second pulse modification settings to the second raw outbound quantum control pulse;

store third pulse modification settings configured for a third signal path and/or third quantum element;

apply the third pulse modification settings to the third raw outbound quantum control pulse;

store fourth pulse modification settings configured for a fourth signal path and/or first quantum element; and

apply the fourth pulse modification settings to the fourth raw outbound quantum control pulse.