In this work, we propose a robust control protocol for achieving high-fidelity control of cat-state qubits. The cat-state qubits are generated in a Kerr nonlinear cavity by a single-photon drive. For high-fidelity control of these qubits, we apply a polychromatic pulse train (PPT), which consists of a sequence of $N$ pulses with different driving amplitudes. By optimizing the parameters of individual pulses in the PPT, errors in the single-photon drive can be suppressed. The ability to suppress such errors can be further enhanced by increasing the pulse-sequence length $N$, albeit at the cost of an extended bit-flip time. Numerical simulations demonstrate that the protocol exhibits strong robustness not only against single-photon drive-strength errors but also against errors in the tunable parameter itself. Furthermore, it maintains high fidelity even under the influence of single-photon losses. We expect that this protocol may provide an effective approach for the robust control of cat-state qubits.

Close

PrevNext

View figure in article

• Quantum computation
• Quantum control
• Quantum error correction
• Quantum information with solid state qubits
• Quantum state engineering
• Superconducting quantum optics
• Superconducting qubits
• Microwave techniques