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Comptes Rendus Physique
Volume 17, n° 7
pages 778-787 (août 2016)
Doi : 10.1016/j.crhy.2016.07.011
Cat-qubits for quantum computation
Qubits de chat pour le calcul quantique
 

Fig. 1




Fig. 1 : 

(a) A protected logical qubit consisting of a register of many qubits: here, we see a possible architecture for the Steane code [11] consisting of 7 qubits requiring the measurement of 6 error syndromes. In this sketch, 7 transmon qubits in a high-Q resonator and the measurement of the 6 error syndromes is ensured through 6 additional ancillary qubits with the possibility of individual readout of the ancillary qubits via independent low-Q resonators. (b) Minimal architecture for a protected logical qubit, adapted to circuit quantum electrodynamics experiments. Quantum information is encoded in a Schrödinger cat state of a single high-Q resonator mode and a single error syndrome is measured, using a single ancillary transmon qubit and the associated readout low-Q resonator.

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