Photonic circuit with embedded control

The nanophotonic circuit proposed by Kerckhoff and coworkers stores one logical qubit in three physical qubits (shown in yellow), which can, for example, be stored in nanooptical cavities. The state of any one physical qubit is continuously compared to the other two (shown in the blue beam lines) and automatically corrected as soon as it is different (shown in the red beam lines, which are controlled via dedicated cavities, here shown in green). Picture: Joseph Kerckhoff/MabuchiLab.
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