Quantum logic circuit qubit layouts
One or more systems, devices and/or methods of use provided herein relate to a device that can facilitate reduction of inter-qubit cross talk and/or allow for increased interaction strengths between qubits as compared to existing technologies. A device can comprise a qubit lattice comprising a plurality of repeated and connected unit cells, and the unit cells comprising individual sets of qubits, wherein the unit cells comprise different cross talk groups of qubits having qubit islands connected together by couplers in different orders, and wherein the different cross talk groups are repeated among the unit cells of the qubit lattice. A device can comprise a qubit lattice comprising a plurality of different, interconnected cross talk groups of qubits, wherein the different cross talk groups are repeated within the qubit lattice.
1. A device, comprising:
a qubit layout comprising a plurality of repeated and connected unit cells, and the plurality of repeated and connected unit cells comprising individual sets of qubits; and
the plurality of repeated and connected unit cells comprising different cross talk groups of qubits having qubit islands connected together by couplers in different orders, wherein the different cross talk groups are repeated among the plurality of repeated and connected unit cells of the qubit layout, wherein the plurality of repeated and connected unit cells comprise first cross talk groups and second cross talk groups, and wherein the first cross talk groups are operable with greater cross talk than the second cross talk groups.
2. The device of claim 1 , wherein the plurality of repeated and connected unit cells comprising the first cross talk groups of qubits have qubit islands connected together in a first order by a plurality of couplers; and
wherein the unit cells comprising the second cross talk groups of qubits have qubit islands connected together in a second order by another plurality of couplers.
3. The device of claim 2 , wherein a quantity of the first cross talk groups are equal to or lesser than a quantity of the second cross talk groups in the qubit layout.
4. The device of claim 1 , wherein the plurality of repeated and connected unit cells comprise first qubits and second qubits of the sets of qubits, and wherein the first qubits have resonant frequencies higher than resonant frequencies of the second qubits.
5. The device of claim 4 , wherein the different cross talk groups individually comprise two first qubits connected in series with a second qubit connected between the two first qubits.
6. The device of claim 5 , wherein, of the different cross talk groups of the unit cells, different groups of the two first qubits and second qubit comprise:
a first island of the second qubit connected separately to the two first qubits; or
different islands of the second qubit connected separately to different ones of the first qubits.
7. The device of claim 4 , wherein the qubit layout comprises:
a greater number of first qubits than second qubits.
8. The device of claim 4 , wherein the qubit layout comprises:
rows of alternated first qubits and second qubits connected to one another in series by the couplers,
wherein adjacent rows are coupled to one another by one or more connector first qubits of the first qubits.
9. The device of claim 1 , wherein the qubit layout comprises:
a plurality of rows of the plurality of repeated and connected unit cells,
wherein plurality of repeated and connected unit cells of adjacent rows are connected to one another by single couplers.
10. A method, comprising:
fabricating, by a system operatively coupled to a processor, a qubit layout by arranging a plurality of repeated and connected unit cells, wherein the plurality of repeated and connected unit cells comprise individual sets of qubits; and
fabricating, by the system, the plurality of repeated and connected unit cells comprising different cross talk groups of qubits having qubit islands connected together by couplers in different orders, wherein the different cross talk groups are repeated among the unit cells of the qubit layout.
11. The method of claim 10 , further comprising:
connecting, by the system, qubit islands together in a first order by a plurality of couplers to fabricate, by the system, the first cross talk groups;
connecting, by the system, qubit islands together in a second order by a plurality of couplers to fabricate, by the system, the second cross talk groups; and
fabricating, by the system, the qubit layout to comprise an equal or lesser quantity of the first cross talk groups than a quantity of the second cross talk groups,
wherein the first cross talk groups are operable with greater cross talk than the second cross talk groups.
12. The method of claim 10 ,
wherein the fabricating the unit cells further comprises
including, by the system, first qubits and second qubits in the qubit layout, wherein the first qubits have resonant frequencies higher than resonant frequencies of the second qubits, and
wherein the fabricating the qubit layout further comprises
including, by the system, a greater number of first qubits than second qubits in the qubit layout.
13. The method of claim 12 , wherein the fabricating the unit cells further comprises:
connecting in series, by the system, two first qubits with a second qubit connected between the two first qubits to define the different cross talk groups.
14. The method of claim 12 , wherein the fabricating the unit cells further comprises:
separately connecting, by the system, a first island of the second qubit to the two first qubits; or
separately connecting, by the system, different islands of the second qubit to different ones of the first qubits.
15. The method of claim 10 , wherein the fabricating the qubit layout further comprises:
arranging in a plurality of rows, by the system, the repeated and connected unit cells; and
connecting, by the system, unit cells of adjacent rows to one another by single couplers.
16. A system, comprising:
a quantum processor; and
a qubit circuit coupled to the quantum processor, wherein the qubit circuit comprises:
a qubit layout comprising a plurality of repeated and connected unit cells, and the plurality of repeated and connected unit cells comprising individual sets of qubits;
the unit cells comprising different cross talk groups of qubits having qubit islands connected together by couplers in different orders, wherein the different cross talk groups are repeated among the unit cells of the qubit layout, and wherein the different cross talk groups have different cross talk ranges.
17. The system of claim 16 , wherein the qubit layout comprises:
a plurality of rows of the plurality of the repeated and connected unit cells,
wherein the plurality of repeated and connected unit cells of adjacent rows are connected to one another by single couplers.
18. The system of claim 16 , wherein the qubit layout is in the form of a heavy hex lattice or a square lattice.
19. A device, comprising:
a qubit layout comprising a plurality of different, interconnected cross talk groups of qubits, wherein the different cross talk groups are repeated within the qubit layout, wherein the different cross talk groups comprise first cross talk groups and second cross talk groups, wherein the first cross talk groups have a different cross talk range than the second cross talk groups, wherein the first cross talk groups comprise a same first connection order of qubit islands, and wherein the second cross talk groups comprise a same second connection order of qubit islands.
20. The device of claim 19 , wherein different rows of the qubit layout comprise a same repeated order of the different, interconnected cross talk groups.
21. The device of claim 19 , wherein pairs of cross talk groups, of the different cross talk groups, overlap by comprising one or more same qubits as one another, wherein the pair of cross talk groups have the same connection order of qubit islands.