Patent ID: 11194659

Abstract:
A method for executing a quantum error correction cycle in a quantum computer provided with a substrate of qubits arranged in repeated unit cells, wherein data qubits (D1, D2, D3, D4) are coupled to respective X- and Z-ancillary qubits (X1, X2, Z1, Z2), wherein a nearest neighbor interaction is provided by detuning a transition frequency of any of the data qubits and ancillary qubits into a coupling frequency for providing a coherent 2-qubit gate, wherein said method comprises the steps of simultaneous coupling of first ones (X1, X2 or Z1, Z2) of the ancillary qubits (X1, X2, Z1, Z2) with a respective neighboring data qubit; and subsequent couplings of said first ones with the other neighboring data qubits; followed by simultaneous coupling of second ones (Z1, Z2 or X1, X2) of the ancillary qubits with a neighboring data qubit; and subsequent couplings of said second ancillary qubit with the other neighboring data qubits.