Quantum Physicist, AMO & Quantum Theory

Infleqtion•Madison, WI

9h•$115,000 - $165,000

About The Position

Infleqtion is on a mission to commercialize atom-based quantum technologies that deliver orders-of-magnitude improvements in sensing and computing applications. As a deep-tech startup, we embrace a results-driven, fast-paced, and customer-focused approach to innovation. We are seeking self-motivated, energetic individuals with exceptional problem-solving and technical skills to help drive our Quantum Computing mission forward. For this theory-focused role, we encourage applications from physicists with expertise in theoretical or experimental Atomic, Molecular, and Optical (AMO) physics, particularly those with experience in the coherent control of quantum systems and design and characterization of quantum gates.

Requirements

PhD in atomic physics, quantum physics, theoretical physics, or a related field; or equivalent related professional experience (4+ years). If you have substantially more experience than this and are excited to apply, please do! We will also consider hiring at the Senior Quantum Physicist level.
Strong background in AMO physics and quantum mechanics, including atom–light interactions, driven quantum systems, and many-body dynamics.
Demonstrated experience modeling and analyzing error mechanisms in quantum systems and quantum gates using analytical methods and numerical simulations, and translating insights into improved designs.
Proficiency in scientific programming (Python required; experience with numerical, optimization, or simulation libraries preferred).
Ability to collaborate closely with experimental physicists and hardware engineers, translating between theoretical models, experimental results, and system-level requirements.
Excellent verbal and written communication skills, with the ability to clearly convey complex theoretical concepts to technical and non-technical audiences.
Strong problem-solving skills and the ability to rapidly learn and apply new concepts.
The ability to independently plan and execute new theoretical efforts given high-level goals and constraints.
Ability to work effectively in a collaborative, agile team environment where engagement, feedback, and shared ownership are essential to success.

Nice To Haves

Experience with neutral-atom quantum computing and Rydberg-based entangling gates.
Experience modeling open quantum systems, noise processes, and decoherence in realistic experimental settings.
Experience with quantum optimal control techniques for high-fidelity quantum gates.
Familiarity with calibration, benchmarking, and characterization protocols for quantum gates and quantum processors.
Experience working closely with experimental teams to iterate between theory, simulation, and laboratory results.
Familiarity with Git, Linux, and command-line tools for collaborative scientific software development.
Enthusiasm for staying up-to-date with the latest developments in AMO physics and quantum information, and for reviewing relevant literature for the team.

Responsibilities

Develop theoretical models of neutral-atom quantum systems to inform system architecture, gate design, and hardware requirements.
Work closely with experimental physicists and hardware engineers to translate physical models and performance targets into actionable system and subsystem requirements.
Analyze and quantify error mechanisms in quantum gates (e.g., decoherence, control errors, crosstalk, laser and atomic noise).
Design, simulate, optimize, and contribute to validation of protocols for quantum gates, calibration, error-mitigation, and compilation to improve fidelity, robustness, and scalability.
Build and maintain simulation, analysis, and optimization software used to predict system behavior and guide experimental design.
Support experimental efforts by interpreting data, diagnosing unexpected behavior, and proposing theory-driven mitigation or design changes.
Self-start and execute new theoretical and modeling efforts given well-defined goals and constraints; scope problems, prioritize approaches, and deliver results on realistic timelines.
Mentor and teach junior team members as indirect reports. Supervise interns.

Benefits

100% company paid Employee coverage for Medical, Dental, Vision, and Short/Long Term Disability insurance programs
Employer funded Health Savings Account
Unlimited Paid Time Off
401(k) Matching Programs
Company paid Life and AD&D Insurance
Flexible Healthcare Savings Account
Paid FMLA Leave
Paid Maternity/Paternity Leave
Employer Assistance Program
Student Loan Repayment
Equity Program