![]() ![]() (c) Geometry and quantum circuit for a measure- X qubit, which stabilizes X ̂ a X ̂ b X ̂ c X ̂ d. (b) Geometric sequence of operations (left), and quantum circuit (right) for one surface code cycle for a measure- Z qubit, which stabilizes Z ̂ a Z ̂ b Z ̂ c Z ̂ d. ![]() The solid line surrounding the array indicates the array boundary. ![]() On the boundaries, the measure qubits contact only three data qubits and perform three-terminal measurements, and the data qubits contact either two or three measure qubits. Away from the boundaries, each data qubit contacts four measure qubits, and each measure qubit contacts four data qubits the measure qubits perform four-terminal measurements.
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February 2023
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