APPARATUS AND METHOD FOR INJECTED SPIN ECHO IN A QUANTUM PROCESSOR

• US 20190042972A1
• Filed: 09/27/2018
• Published: 02/07/2019
• Est. Priority Date: 09/27/2018
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Justin Hogaboam
• Inventors: Zou, Xiang, Hogaboam, Justin
• Granted Patent: US 11,704,588 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 9/22 Microcontrol or microprogram arrangements
• CPC Class Codes: G06F 9/30101 Special purpose registers
• CPC Class Codes: G06F 9/3017 Runtime instruction translation, e.g. macros
• CPC Class Codes: G06F 9/3877 using a slave processor, e.g. coprocessor peripheral processor G06F13/12; vector processor G06F15/8053
• CPC Class Codes: G06N 10/00 Quantum computing, i.e. information processing based on quantum-mechanical phenomena
• CPC Class Codes: G06N 10/70 Quantum error correction, detection or prevention, e.g. surface codes or magic state distillation
• CPC Class Codes: G06N 20/00 Machine learning

Abstract

Apparatus and method for injected spin echo sequences in a quantum processor. For example, one embodiment of a processor comprises a decoder to decode quantum instructions to generate quantum microoperations (uops) and non-quantum instructions to generate non-quantum uops; execution circuitry to execute the quantum uops and non-quantum uops; a corrective sequence data structure to identify and/or store corrective sets of uops for one or more of the quantum instructions; wherein the decoder is to query the corrective sequence data structure upon receiving a first quantum instruction to determine if one or more corrective uops exist and if the one or more corrective uops exist, then to submit the one or more corrective uops for execution by the execution circuitry.

Claims

1. A processor comprising:

a decoder to decode quantum instructions to generate quantum microoperations (uops) and non-quantum instructions to generate non-quantum uops;

execution circuitry to execute the quantum uops and non-quantum uops;

a corrective sequence data structure to identify and/or store corrective sets of uops for one or more of the quantum instructions;

wherein the decoder is to query the corrective sequence data structure upon receiving a first quantum instruction to determine if one or more corrective uops exist and if the one or more corrective uops exist, then to submit the one or more corrective uops for execution by the execution circuitry.

2. The processor of claim 1 wherein the corrective sequence data structure comprises a table having a plurality of entries, wherein a first entry is to be identified for the first instruction.

3. The processor of claim 2 wherein each entry in the table specifies a set of one or more uops to implement a spin echo operation on an associated one or more qubits.

4. The processor of claim 1 wherein the corrective sequence data structure comprises microcode storage and the one or more corrective uops are encoded in microcode.

5. The processor of claim 1 wherein the first quantum instruction comprises a logical two qubit instruction to perform an operation on a pair of qubits.

6. The processor of claim 5 wherein the two qubit instruction identifies a first qubit and a second qubit which require different correction pulses, and wherein the different correction pulses are encoded in the one or more corrective uops.

7. The processor of claim 6 further comprising:

quantum index generation circuitry to generate first and second index values to identify the first and second qubits, respectively, within the quantum processor.

8. The processor of claim 7 wherein to generate the first index value for the first qubit, the quantum index generation circuitry is to read the first index value from a first architectural register identified by a first quantum uop generated by the decoder and wherein to generate the second index value, the quantum index generation circuitry is to perform an operation using the first index value.

9. The processor of claim 1 further comprising:

execution circuitry to execute the one or more corrective uops; and

a classical-quantum (C-Q) interface to couple the execution circuitry to a quantum processor, the C-Q interface comprising digital-to-analog circuitry to generate analog signals to manipulate a current state of one or more qubits of the quantum processor in response to execution of the one or more corrective uops.

10. The processor of claim 9 wherein the digital-to-analog circuitry of the C-Q interface comprises a codeword triggered pulse generation (CTPG) unit to generate one or more analog pulses to control the one or more qubits in response to receipt of the first codeword.

11. The processor of claim 1 wherein the one or more corrective uops are submitted for execution in place of a first set of uops normally generated in response to non-corrective decoding of the first quantum instruction.

12. The processor of claim 1 wherein the one or more corrective uops are submitted for execution in combination with a first set of uops generated in response to non-corrective decoding of the first quantum instruction.

13. A method comprising:

decoding quantum instructions to generate quantum microoperations (uops);

decoding non-quantum instructions to generate non-quantum uops; and

querying a corrective sequence data structure to identify corrective sets of uops for one or more of the quantum instructions, wherein if one or more corrective uops exist for a first quantum instruction, then using the one or more corrective uops when decoding the first instruction.

14. The method of claim 13 wherein the corrective sequence data structure comprises a table having a plurality of entries, wherein a first entry is to be identified for a first quantum instruction.

15. The method of claim 14 wherein each entry in the table specifies a set of one or more uops to implement a spin echo operation on an associated one or more qubits.

16. The method of claim 13 wherein the corrective sequence data structure comprises microcode storage and the one or more corrective uops are encoded in microcode.

17. The method of claim 13 wherein the first quantum instruction comprises a logical two qubit instruction to perform an operation on a pair of qubits.

18. The method of claim 17 wherein the two qubit instruction identifies a first qubit and a second qubit which require different correction pulses, and wherein the different correction pulses are encoded in the one or more corrective uops.

19. The method of claim 18 further comprising:

generating first and second index values to identify the first and second qubits, respectively, within the quantum processor.

20. The method of claim 19 wherein to generate the first index value for the first qubit, the quantum index generation circuitry is to read the first index value from a first architectural register identified by a first quantum uop generated by the decoder and wherein to generate the second index value, the quantum index generation circuitry is to perform an operation using the first index value.

21. The method of claim 13 further comprising:

executing the one or more corrective uops; and

generating analog signals to manipulate a current state of one or more qubits of the quantum processor in response to execution of the one or more corrective uops.

22. The method of claim 21 further comprising:

generating one or more analog pulses to control the one or more qubits in response to receipt of the first codeword.

23. The method of claim 13 wherein the one or more corrective uops are submitted for execution in place of a first set of uops normally generated in response to non-corrective decoding of the first quantum instruction.

24. The method of claim 13 wherein the one or more corrective uops are submitted for execution in combination with a first set of uops generated in response to non-corrective decoding of the first quantum instruction.

25. A machine-readable medium having program code stored thereon which, when executed by a machine, causes the machine to perform the operations of:

decoding quantum instructions to generate quantum microoperations (uops);

decoding non-quantum instructions to generate non-quantum uops; and

querying a corrective sequence data structure to identify corrective sets of uops for one or more of the quantum instructions, wherein if one or more corrective uops exist for a first quantum instruction, then using the one or more corrective uops when decoding the first instruction.

26. The machine-readable medium of claim 25 wherein the corrective sequence data structure comprises a table having a plurality of entries, wherein a first entry is to be identified for a first quantum instruction.

27. The machine-readable medium of claim 26 wherein each entry in the table specifies a set of one or more uops to implement a spin echo operation on an associated one or more qubits.

28. The machine-readable medium of claim 25 wherein the corrective sequence data structure comprises microcode storage and the one or more corrective uops are encoded in microcode.

29. The machine-readable medium of claim 25 wherein the first quantum instruction comprises a logical two qubit instruction to perform an operation on a pair of qubits.

30. The machine-readable medium of claim 29 wherein the two qubit instruction identifies a first qubit and a second qubit which require different correction pulses, and wherein the different correction pulses are encoded in the one or more corrective uops.

31. The machine-readable medium of claim 30 further comprising program code to cause the machine to perform the operations of:

generating first and second index values to identify the first and second qubits, respectively, within the quantum processor.

32. The machine-readable medium of claim 31 wherein to generate the first index value for the first qubit, the quantum index generation circuitry is to read the first index value from a first architectural register identified by a first quantum uop generated by the decoder and wherein to generate the second index value, the quantum index generation circuitry is to perform an operation using the first index value.

33. The machine-readable medium of claim 25 further comprising program code to cause the machine to perform the operations of:

executing the one or more corrective uops; and

generating analog signals to manipulate a current state of one or more qubits of the quantum processor in response to execution of the one or more corrective uops.

34. The machine-readable medium of claim 33 further comprising program code to cause the machine to perform the operations of:

generating one or more analog pulses to control the one or more qubits in response to receipt of the first codeword.

35. The machine-readable medium of claim 25 wherein the one or more corrective uops are submitted for execution in place of a first set of uops normally generated in response to non-corrective decoding of the first quantum instruction.

36. The machine-readable medium of claim 25 wherein the one or more corrective uops are submitted for execution in combination with a first set of uops generated in response to non-corrective decoding of the first quantum instruction.