Expert Quantum Physicist

Alice & Bob is developing the first universal, fault-tolerant quantum computer, based on the Schrödinger cat qubit. The role is to own the numerical simulation strategy for superconducting qubits, setting direction, defining what counts as a trustworthy result, and identifying where methods need to improve. The role works across quantum physics, microwave engineering, and numerical methods. The technical lead will define the simulation approach from microwave design to qubit dynamics and will work closely with the physicists and engineers in the details.

Responsibilities

Own the predictive performance of the simulation stack end to end, covering accuracy, reliability, and efficiency from device physics through numerical implementation; Set the standard for what "trustworthy" means across microwave, quantum, and numerical simulations, defining accuracy, convergence, and validation practices and leading the theoretical justification of tools and methods; Find and fix what is holding the stack back, whether performance, robustness, or model fidelity; Shape the roadmap for simulation tools, working closely with domain experts across the company; Close the loop with experiment by validating simulations against measured device performance alongside experimentalists; Be the expert reference on simulation methodology across the team

Requirements

7+ years of post-PhD experience in a relevant academic field or industry; PhD or equivalent in quantum physics, applied physics, electrical engineering, quantum information, or computational physics; Proven track record of technical leadership in simulation or modeling methodology at the organizational level, with results that directly shaped device design decisions; Broad, hands-on mastery across the full simulation chain, from device physics to numerical implementation, with go-to depth in at least one area; Deep experience simulating superconducting qubits or comparable systems, including finite element methods (Ansys HFSS, COMSOL, Palace), circuit quantization (scQubits, Quantum Metal), and quantum simulation (QuTiP, Dynamiqs, CUDA-Q); Command of circuit QED, Hamiltonian modeling, open quantum systems, decoherence mechanisms, physical gates and measurement; Fluency in microwave engineering for quantum applications, including passive components, active devices, and measurement instrumentation (VNAs, spectrum analyzers, homodyne/heterodyne detection); Strong software engineering foundations for scientific computing (Python, NumPy/SciPy or JAX, Git); Judgment to determine when a simulation result can and cannot be trusted, and ability to build shared views among teams and domain experts; Track record of mentoring senior scientists and engineers and building consensus among specialists from different fields; Fluent English and excellent written and verbal communication skills

Nice to have

Hands-on experience with HPC or large-scale simulations; Publications in circuit QED or computational electromagnetics; Hands-on experience in experimental research with quantum devices

Benefits

BSPCE plan; Direct IP compensation through bonuses for driving core patents; Flexible remote policy, up to 40% a month; Parental plan including crèche support and additional days off for children under 12; Subsidized membership with Urban Sports Club; Mental health support with moka.care; 25-day vacation policy (as per French law) plus RTT; Half of transportation cost coverage (as per French law), or yearly allowance for bicycle users; Competitive health coverage with Alan; Meal vouchers with Swile and access to a fully equipped kitchen; French language courses covered by the company