Quantum Physicist, AMO & Quantum Theory

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.

Location

Infleqtion has offices in the USA United Kingdom and Australia. This is a full-time hybrid position in our Oxford Offices.

Role and 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.
• Analyse 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 behaviour and guide experimental design.
• Support experimental efforts by interpreting data diagnosing unexpected behaviour and proposing theory-driven mitigation or design changes.
• Self-start and execute new theoretical and modelling 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.

• 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 atomlight interactions.
• 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.

It is a plus if you have:

• Experience with neutral-atom quantum computing Rydberg-based entangling gates and/or optical tweezer arrays.
• 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.

Note

This position may require access to information protected under U.S. export control laws and regulations for quantum computing technology. Please note that any offer for employment may be conditioned on authorisation to receive software or technology controlled under these U.S. export control laws and regulations without sponsorship for an export license.

TRAVEL

Up to 10% travel may be required.

EQUAL OPPORTUNITY

Regardless of your interest in the quantum industry you can take pride in the fact that Infleqtion is building an ecosystem of quantum technologies and commercial products driving the industry towards the future. Studies reveal that while men apply for jobs when they meet an average of 60% of the requirements women and other groups tend to apply only when they meet all the criteria. If you believe you have the potential but dont meet every single point in our job advertisement please dont hesitate to contact us! We would love to chat with you and see how you could bring great value to our team. Our goal is to find exceptional individuals who can enrich our team culture actively contribute and have a genuine passion for their work. Here you have freedom to embrace your whole self: who you love your gender identity and expression skin colour age appearance disability neurodiversity DNA military/veteran status citizenship and other factors that make up who you are. Your uniqueness is valued welcomed and appreciated here. We are dedicated to providing a positive workplace and base all employment decisions on your qualifications performance merits as well as business needs. We are proud to be an Equal Employment Opportunity Employer.

In addition to your base compensation we offer a generous Total Rewards program which includes:

• Competitive salary
• Incentive Stock Option Plan
• Generous company 10% pension contribution regardless of employee contribution
• Unlimited PTO
• BUPA healthcare after probation period
• Cycle to work and Technology scheme

Required Experience:

IC