Abstract: Robust optimal control techniques are provided that may shape driving pulses such that the gates are realised with high fidelity despite experimental uncertainty in all or some of the physical parameters of the qubits, drives, qubit-qubit coupling, and qubit-drive coupling. For example, a method for controlling a quantum system comprising a plurality of coupled qubits may comprise: i) assigning the qubits to a plurality of subgroups, wherein the assigning comprises selecting at least one driven qubit and a plurality of undriven qubits for each subgroup, such that each undriven qubit in a subgroup is coupled to a driven qubit in that subgroup and such that any two adjacent subgroups share at least one undriven qubit and do not share any driven qubit; and ii) applying drive signals to each driven qubit to implement a set of desired quantum gates at the driven qubits, wherein the application of the drive signals to the driven qubits at the same time implements the identity gate at each undriven qubit.

Abstract: Robust optimal control techniques are provided that may shape driving pulses such that the gates are realised with high fidelity despite experimental uncertainty in all or some of the physical parameters of the qubits, drives, qubit-qubit coupling, and qubit-drive coupling. For example, a method for controlling a quantum system comprising a plurality of coupled qubits may comprise: i) assigning the qubits to a plurality of subgroups, wherein the assigning comprises selecting at least one driven qubit and a plurality of undriven qubits for each subgroup, such that each undriven qubit in a subgroup is coupled to a driven qubit in that subgroup and such that any two adjacent subgroups share at least one undriven qubit and do not share any driven qubit; and ii) applying drive signals to each driven qubit to implement a set of desired quantum gates at the driven qubits, wherein the application of the drive signals to the driven qubits at the same time implements the identity gate at each undriven qubit.