1. A quantum processor comprising: a first set of qubits and a first set of coupling devices providing communicative coupling between qubits in the first set of qubits; a first set of replica qubits and a first set of replica coupling devices providing communicative coupling between the first set of replica qubits, wherein for each qubit in the first set of qubits a corresponding replica qubit exists in the first set of replica qubits, and for each coupling device in the first set of coupling devices a replica coupling device exists in the first set of replica coupling devices; and a second set of coupling devices, wherein each coupling device in the second set of coupling devices provides communicative coupling between a qubit in the first set of qubits and the corresponding replica qubit in the first set of replica qubits.