Dr. Ronan Gautier
Theoretical Physicist @ Alice & Bob
Cat qubits encode quantum information in the metastable states of a quantum harmonic oscillator, offering robust protection to bit-flip errors. This talk presents a cat qubit with bit-flip durations over ten seconds, greatly surpassing both previous implementations of the qubit and the lifetime of its components. This is achieved through a new quantum tomography method that preserves bit-flip protection, and allows the control and readout of quantum superposition states with phase-flip times over several hundreds of nanoseconds. This progress in controlling the qubit phase while maintaining long bit-flip times is key for scalable, fault-tolerant and hardware-efficient architectures of quantum computers.