Repetition Cat Qubits for Fault-Tolerant Quantum Computation

Understand

We present a 1D repetition code based on the so-called cat qubits as a viable approach toward hardware-efficient universal and fault-tolerant quantum computation.

• The cat qubits that are stabilized by a two-photon driven-dissipative process, exhibit a tunable noise bias where the effective bit-flip errors are exponentially suppressed with the average number of photons.
• We propose a realization of a set of gates on the cat qubits that preserve such a noise bias.
• Combining these base qubit operations, we build, at the level of the repetition cat qubit, a universal set of fully protected logical gates.