Patent ID: 9727823
Date: 2017-08-08
CPC Classifications: G06N

Claim:
1. A method of controlling qubit parameters in a quantum processor, wherein the quantum processor includes a plurality of qubits, each qubit having a respective first programmable parameter and a respective second programmable parameter that at least partially depends on the respective first programmable parameter, and a plurality of coupling devices that each selectively provide communicative coupling between respective pairs of the qubits, the method comprising: communicatively coupling at least three of the qubits to one another as a single logical qubit, the single logical qubit formed by a first outermost qubit, a second outermost qubit and at least one intermediary qubit, the at least one intermediary qubit communicatively coupled between the first and the second outermost qubits with sufficient coupling strength for the at least three qubits to act as a single qubit through an evolution of the quantum processor, the first outermost qubit being an outermost qubit of the qubits of the logical qubit in a first direction along a logical qubit communicative path defined by the qubits of the logical qubit and the second outermost qubit being an outermost qubit in a second direction along the logical qubit communicative path; for at least one of the at least one intermediate qubits of the logical qubit, communicatively coupling a control qubit to the respective intermediate qubit such that the control qubit is not communicatively coupled to any other qubit except via the respective intermediate qubit; programming the first and the second outermost qubits to have respective first programmable parameters less than or equal to a first value through the evolution of the quantum processor; and programming the control qubit to have a value of the first programmable parameter higher than the first value through the evolution of the quantum processor.