Efficient Cat Qubit Simulation Intern (Quantum Computing)

Location: Hybrid in Paris, France

Company

Alice & Bob is developing a universal, fault-tolerant quantum computer based on superconducting Schrödinger cat qubits with autonomous quantum error correction.

What you will do

• Develop tensor-network and quantum-trajectory simulation methods for many-mode cat-qubit systems using Lindblad master-equation unravelings.
• Extend efficient single-cat-qubit simulation methods to multi-mode operations and estimate bit-flip probabilities and rates from simulated trajectories.
• Verify numerical robustness through Hilbert-space and bond-dimension truncation, solver stability, precision, and convergence checks.
• Validate results against exact master-equation and single-qubit references, theoretical predictions, and standard Monte Carlo sampling.
• Analyse bit-flip trajectories, explain discrepancies with theoretical expectations, and quantify computational cost and scaling.
• Document methods, code, and results; present progress and recommendations to the Simulation Model team.

Requirements

• Master’s or final-year engineering student with a strong background in quantum physics and numerical methods.
• Proficient in English.
• Good understanding of quantum mechanics and open quantum systems, including density matrices and Lindblad master equations.
• Programming experience in Python or Julia for scientific computing.
• Autonomy and comfort with open-ended research questions without a guaranteed answer.
• Clear technical communication and a collaborative attitude within a multidisciplinary team.
• No prior professional experience is required.

Nice to have

• Familiarity with quantum trajectories and stochastic unraveling.
• Exposure to tensor-network methods such as matrix product states.
• Knowledge of Monte Carlo methods and statistical estimation.
• Experience with Julia, numerical ODE/SDE solvers, GPU-accelerated computing, or high-performance computing.
• Rigorous numerical practice, including convergence checks, truncation control, and solver and precision selection.
• Experience reading and applying current research literature.
• Previous research, project, or internship experience in quantum physics or scientific computing.

Culture & Benefits

• Join an early-stage French startup developing a practical fault-tolerant quantum computer.
• Work in a diverse team of more than 250 people from over 35 countries.
• One day off per month.
• Half of transportation costs covered according to French law.
• Meal vouchers through Swile and access to a fully equipped, regularly stocked kitchen.
• Friendly, collaborative environment with opportunities to share knowledge, innovate, and grow.