Frequency management for quantum control

Patent metadata

Field	Value
Publication number	US-12273111-B2
Application number	US-202418420330-A
Country	US
Kind code	B2
Filing date	Jan 23, 2024
Priority date	Aug 5, 2020
Publication date	Apr 8, 2025
Grant date	Apr 8, 2025

Abstract

A system comprises quantum control interconnect circuitry configured to receive a plurality of fixed-frequency signals, a variable-frequency signal, a quantum control pulse, a quantum element readout pulse, and a quantum element return pulse. The circuitry is operable to upconvert the quantum control pulse using the fixed-frequency signals. The circuitry is operable to upconvert the readout pulse using the variable-frequency signal. The circuitry is operable to downconvert the return pulse using the variable-frequency signal.

First claim

What is claimed is:

1. A system comprising:
circuitry operable to:
generate a quantum control pulse;
upconvert the quantum control pulse according to a plurality of fixed-frequency signals;
upconvert a quantum readout pulse using one or more of the plurality of fixed-frequency signals; and
convey the upconverted quantum readout pulse to a quantum element readout circuit.

2. The system of claim 1 , wherein the circuitry is operable to:
generate a baseband pulse; and
upconvert the baseband pulse to an intermediate frequency to generate the quantum control pulse.

3. The system of claim 1 , wherein the circuitry is operable to:
convey the upconverted quantum control pulses to one or more qubits.

4. The system of claim 1 , wherein the circuitry is operable to:
route one or more of the plurality of fixed-frequency signals.

5. The system of claim 4 , wherein the routing is controllable via one or more digital control signals.

6. The system of claim 1 , wherein the circuitry is operable to:
downconvert a return pulse from the quantum element readout circuit.

7. The system of claim 1 , wherein:
the circuitry comprises a crystal oscillator and a signal processor;
the crystal oscillator is configured to generate a fixed-frequency intermediary signal; and
the signal processor is configured to process the fixed-frequency intermediary signal to generate a plurality of fixed-frequency signals.

8. The system of claim 7 , wherein one or more of the plurality of fixed-frequency signals are generated from two or more outputs of a plurality of resonators.

9. The system of claim 1 , wherein a frequency of each of the plurality of fixed-frequency signals is an integer multiple of a frequency of a fixed-frequency intermediary signal.

10. A method comprising:
generating a quantum control pulse; and
upconverting the quantum control pulse according to a plurality of fixed-frequency signals;
upconverting a quantum readout pulse using one or more of the plurality of fixed-frequency signals; and
conveying the upconverted quantum readout pulse to a quantum element readout circuit.

11. The method of claim 10 , wherein the method comprises:
generating a baseband pulse; and
upconverting the baseband pulse to an intermediate frequency to generate the quantum control pulse.

12. The method of claim 10 , wherein the method comprises:
conveying the upconverted quantum control pulses to one or more qubits.

13. The method of claim 10 , wherein the method comprises:
routing one or more of the plurality of fixed-frequency signals.

14. The method of claim 13 , wherein the method comprises:
controlling the routing via one or more digital control signals.

15. The method of claim 10 , wherein the method comprises:
downconverting a return pulse from the quantum element readout circuit.

16. The method of claim 10 , wherein the method comprises:
generating, via a crystal oscillator, a fixed-frequency intermediary signal; and
processing, via a signal processor, the fixed-frequency signal to generate the plurality of fixed-frequency signals.

17. The method of claim 16 , wherein the method comprises:
generating one or more of the plurality of fixed-frequency signals from a plurality of resonators.

18. The method of claim 10 , wherein a frequency of each of the plurality of fixed-frequency signals is an integer multiple of a frequency of a fixed-frequency intermediary signal.

19. A system comprising:
circuitry operable to:
generate a quantum control pulse; and
upconvert the quantum control pulse according to a plurality of fixed-frequency signals, wherein:
the circuitry comprises a crystal oscillator and a signal processor,
the crystal oscillator is configured to generate a fixed-frequency intermediary signal,
the signal processor is configured to process the fixed-frequency intermediary signal to generate a plurality of fixed-frequency signals, and
one or more of the plurality of fixed-frequency signals are generated from two or more outputs of a plurality of resonators.

20. The system of claim 19 , wherein the circuitry is operable to:
generate a baseband pulse; and
upconvert the baseband pulse to an intermediate frequency to generate the quantum control pulse.

21. The system of claim 19 , wherein the circuitry is operable to:
convey the upconverted quantum control pulses to one or more qubits.

22. The system of claim 19 , wherein the circuitry is operable to:
route one or more of the plurality of fixed-frequency signals.

23. The system of claim 22 , wherein the routing is controllable via one or more digital control signals.

24. The system of claim 19 , wherein a frequency of each of the plurality of fixed-frequency signals is an integer multiple of a frequency of a fixed-frequency intermediary signal.

25. A method comprising:
generating a quantum control pulse;
upconverting the quantum control pulse according to a plurality of fixed-frequency signals;
generating, via a crystal oscillator, a fixed-frequency intermediary signal;
processing, via a signal processor, the fixed-frequency signal to generate the plurality of fixed-frequency signals; and
generating one or more of the plurality of fixed-frequency signals from a plurality of resonators.

26. The method of claim 25 , wherein the method comprises:
generating a baseband pulse; and
upconverting the baseband pulse to an intermediate frequency to generate the quantum control pulse.

27. The method of claim 25 , wherein the method comprises:
conveying the upconverted quantum control pulses to one or more qubits.

28. The method of claim 25 , wherein the method comprises:
routing one or more of the plurality of fixed-frequency signals.

29. The method of claim 28 , wherein the method comprises:
controlling the routing via one or more digital control signals.

30. The method of claim 25 , wherein a frequency of each of the plurality of fixed-frequency signals is an integer multiple of a frequency of a fixed-frequency intermediary signal.

Assignees

• Quantum Machines
• Q M Tech Ltd

Inventors

• Szmuk Ramon
• Ella Lior
• Cohen Yonatan
• Sivan Itamar
• Ofek Nissim

Classifications

• G06N10/80

  Quantum programming, e.g. interfaces, languages or software-development kits for creating or handling programs capable of running on quantum computers; Platforms for simulating or accessing quantum computers, e.g. cloud-based quantum computing · CPC title

• G06N10/40

  Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control · CPC title

• H03L7/099

  concerning mainly the controlled oscillator of the loop · CPC title

• H03K3/38 Primary

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

• H03K19/195 Primary

  using superconductive devices · CPC title