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1. WO2019105715 - ACCORD DE FRÉQUENCE DE SYSTÈMES À BITS QUANTIQUES MULTIPLES

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CLAIMS

1. A method of forming a multi-qubit chip, the method comprising:

forming a plurality of qubits on a chip, wherein each qubit comprises a Josephson junction;

determining an initial frequency of each qubit on the chip;

based on the initial frequency of each qubit, determining a desired frequency for each qubit of the chip; and annealing a first Josephson junction of a first qubit of the plurality of qubits, wherein annealing the first Josephson junction causes the first qubit to change from a first frequency to about the desired frequency.

2. The method of claim 1 , wherein annealing the first Josephson junction comprises localized laser annealing of the first Josephson junction.

3. The method of claim 1 or claim 2, wherein annealing the first Josephson junction causes the first frequency to increase.

4. The method of claim 3, further comprising annealing a second Josephson junction of a second qubit of the plurality of qubits, wherein annealing the second Josephson junction causes a second frequency of the second qubit to decrease to a second desired frequency.

5. The method of claim 1 or claim 2, wherein annealing the first Josephson junction causes the first frequency to decrease.

6. The method of claim 1 , wherein a parameter for annealing the first Josephson junction is based on a historical anneal database relating anneal parameters to frequency shifts.

7. A method of forming a multi-qubit chip, the method comprising:

determining a desired frequency for each of the plurality of qubits on the chip;

forming the plurality of qubits on the chip, wherein each qubit comprises a Josephson junction;

determining a first frequency of a first qubit of the plurality of qubits; and

annealing the Josephson junction of the first qubit, wherein annealing the Josephson junction causes the qubit to change from the first frequency to about the desired frequency.

8. The method of claim 7, wherein annealing the first Josephson junction comprises localized laser annealing of the first Josephson junction.

9. The method of claim 7, wherein annealing the first Josephson junction causes the first frequency to increase.

10. The method of claim 9, further comprising annealing a second Josephson junction of a second qubit of the plurality of qubits, wherein annealing the second Josephson junction causes a second frequency of the second qubit to decrease to a second desired frequency.

11. The method of claim 7, wherein annealing the first Josephson junction causes the first frequency to decrease.

12. The method of claim 7, wherein forming the plurality of qubits is based on the desired frequency for each of the plurality of qubits, and wherein dimensions of the first qubit are different from dimensions of a second qubit of the plurality of qubits.

13. A multi-qubit chip formed by:

forming a plurality of qubits on a chip, wherein each qubit comprises a Josephson junction;

determining an initial frequency of each qubit on the chip;

based on the initial frequency, determine a desired frequency for each qubit of the chip; and

annealing a first Josephson junction of a first qubit of the plurality of qubits, wherein annealing the first Josephson junction causes the first qubit to change from the first frequency to about the desired frequency.

14. The multi-qubit chip of claim 13, wherein annealing the first Josephson junction comprises localized annealing of the first Josephson junction.

15. The multi-qubit chip of claim 13, wherein annealing the first Josephson junction causes the first frequency to increase.

16. The multi-qubit chip of claim 15, further comprising annealing a second Josephson junction of a second qubit of the plurality of qubits, wherein annealing the second Josephson junction causes a second frequency of the second qubit to decrease to a second desired frequency.

17. The multi-qubit chip of claim 13, wherein annealing the first Josephson junction causes the first frequency to decrease.

18. A multi-qubit chip formed by:

determining a desired frequency for a plurality of qubits on a chip;

forming the plurality of qubits on the chip, wherein each qubit comprises a Josephson junction;

determining a first frequency of a first qubit of a plurality of qubits;

annealing the Josephson junction, wherein annealing the Josephson junction causes the qubit to change from the first frequency to about the desired frequency.

19. The multi-qubit chip of claim 18, wherein annealing the first Josephson junction comprises localized annealing of the first Josephson junction.

20. The multi-qubit chip of claim 18, wherein annealing the first Josephson junction causes the first frequency to increase.

21. The multi-qubit chip of claim 20, further comprising annealing a second Josephson junction of a second qubit of the plurality of qubits, wherein annealing the second Josephson junction causes a second frequency of the second qubit to decrease to a second desired frequency.

22. The multi-qubit chip of claim 18, wherein annealing the first Josephson junction causes the first frequency to decrease.

23. The multi-qubit chip of claim 18, wherein forming the plurality of qubits is based on the desired frequency for each of the plurality of qubits, and wherein the dimensions of the first qubit is different from the dimensions of a second qubit of the plurality of qubits.

24. A multi-qubit chip comprising:

a first qubit containing a first Josephson junction; and

a second qubit containing a second Josephson junction, wherein a first resistance of the first Josephson junction is different from a second resistance of the second Josephson junction.

25. The multi-qubit chip of claim 24, wherein a difference between the first resistance and the second resistance causes a first frequency of the first qubit to not collide with a second frequency of the second qubit.