Highly robust logical qubit encoding in an ensemble of V-symmetrical qutrits
The authors propose encoding a logical qubit using even and odd Schrödinger cat states derived from U(3) coherent states of an ensemble of V-configured qutrits. These stationary states are parameter-independent dark states, offering immunity to dissipation and correlated collective dephasing. This method enables robust quantum gates, including a NOT gate, making the encoded logical qubit highly resilient against noise.