Mediating coupling of quantum bits using chains of resonators and tunable inductive couplers
AssigneeInternational Business Machines Corporation
InventorsAaron Finck, David Zajac, Jiri Stehlik
Life of this patent
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Abstract
Techniques are provided for mediating interactions (e.g., long range interactions) between quantum bits to facilitate quantum computing operations such as two-qubit gate operations. A device comprises a first quantum bit, a second quantum bit, and a coupling bus connecting the first quantum bit and the second quantum bit. The coupling bus comprises a plurality of transmission line resonators which are coupled in series, and at least one tunable inductive coupler to control a coupling between a first transmission line resonator and a second transmission line resonator of the plurality of transmission line resonators.
Claims20
A device, comprising:
- a first quantum bit;
- a second quantum bit;
- and
- a coupling bus connecting the first quantum bit and the second quantum bit, wherein the coupling bus comprises a plurality of transmission line resonators which are coupled in series, and at least one tunable inductive coupler to control a coupling between a first transmission line resonator and a second transmission line resonator of the plurality of transmission line resonators.
A system, comprising;
- a quantum processor comprising a first quantum bit, a second quantum bit, and a coupling bus connecting the first quantum bit and the second quantum bit, wherein the coupling bus comprises a plurality of transmission line resonators which are coupled in series, and at least one tunable inductive coupler to control a coupling between a first transmission line resonator and a second transmission line resonator of the plurality of transmission line resonators;
- and
- a control system configured to generate a control signal to tune the at least one tunable inductive coupler of the coupling bus into one of:
- a first operating state to couple the first transmission line resonator and the second transmission line resonator to enable exchange coupling between the first quantum bit and the second quantum bit over the coupling bus;
- and a second operating state to decouple the first transmission line resonator and the second transmission line resonator to suppress exchange coupling between the first quantum bit and the second quantum bit over the coupling bus.
A method, comprising:
- controlling an exchange interaction between a first quantum bit and a second quantum bit that are connected by a coupling bus which comprises a plurality of transmission line resonators that are coupled in series, and at least one tunable inductive coupler to control a coupling between a first transmission line resonator and a second transmission line resonator of the plurality of transmission line resonators;
- wherein controlling the exchange interaction between the first quantum bit and the second quantum bit comprises:
- tuning the at least one tunable inductive coupler of the coupling bus into a first operating state to couple the first transmission line resonator and the second transmission line resonator to enable exchange coupling between the first quantum bit and the second quantum bit over the coupling bus;
- and
- tuning the at least one tunable inductive coupler of the coupling bus into a second operating state to decouple the first transmission line resonator and the second transmission line resonator to suppress exchange coupling between the first quantum bit and the second quantum bit over the coupling bus.
Dependencies are inferred from the claim text.