Staff Quantum Physicist

Infleqtion; Chicago (IL); On-site; USD 166,000 - 256,000; Full time

Benefits offered by this job

100% medical, dental, vision

HSA funded

Unlimited PTO

401(k) matching

Life insurance

Flexible HSA

Paid leave (FMLA)

Maternity/Paternity leave

Employee assistance program

Student loan repayment

Job summary

Infleqtion in Chicago, IL, is seeking a highly experienced quantum systems engineer to lead the design, integration, and optimization of neutral-atom quantum computing platforms. You will translate ambitious goals into concrete experimental plans and drive cross-functional delivery across processor design, laser systems, and control software.

Candidates should have a PhD in AMO/quantum physics or equivalent, strong hands-on experience, proficiency in Python and Linux, and a track record of

Qualifications

• PhD in atomic, optical, AMO, quantum physics, or related field; or equivalent post-PhD experience; typically 5+ years leading quantum/precision-measurement systems.
• Hands-on experience designing, operating, or improving AMO or coherent-control experiments; knowledge of atom-light interactions and laser tech.
• Proficiency with Python for experiment control, data analysis, or automation; Linux and version control experience.
• Ability to translate ambiguous goals into executable plans, lead cross-disciplinary system-level work, and communicate with technical and non-technical audiences.

Responsibilities

• Lead design, integration, calibration, operation, and improvement of neutral-atom quantum computing systems.
• Translate goals into experimental plans, performance targets, and technical direction across processor design and laser systems.
• Design and analyze experiments and models to improve gate fidelity, stability, and processor performance; guide tradeoffs.
• Own critical systems through validation, troubleshooting, and documentation; drive cross-functional delivery.
• Develop Python-based tools for experiment control, data analysis, calibration, and automation.
• Review technical work and uphold team standards.

Skills

Python

Linux

Experiment control

Leadership

Education

PhD in AMO/atomic physics

Tools

Laser systems

RF instrumentation

Ultra-high-vacuum systems

AC/EO modulators

Job description

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. We encourage applications from experimental physicists with expertise in Atomic, Molecular, and Optical (AMO) physics, particularly those with experience in the coherent control of quantum systems such as ultracold atoms, trapped ions, and diamond NV centers.

Role And Responsibilities

• Lead the design, integration, calibration, operation, and improvement of neutral-atom quantum computing systems and critical subsystems
• Translate program goals into technical requirements, experimental plans, performance targets, and technical direction across quantum processor design, Rydberg excitation, gate protocols, laser systems, calibration, and system integration
• Design and analyze experiments and physics-based models to improve gate fidelity, stability, availability, and processor performance; guide architecture and engineering tradeoffs
• Own critical systems through validation, troubleshooting, performance tuning, reliability improvement, and documentation; translate complex R&D objectives into prioritized work and drive cross-functional delivery
• Develop Python-based tools in Linux environments for experiment control, data analysis, calibration, automation, and operational support
• Review technical work and uphold team standards and best practices
• Manage up to six direct reports, including expectations, performance, coaching, and career development.
• Contribute to hiring, proposals, intellectual property, technical roadmaps, and external technical discussions

Requirements

• PhD in atomic, optical, AMO, quantum physics, or a related field, or equivalent professional experience; typically 5+ years of relevant post-PhD experience or comparable experience leading complex quantum, atomic, optical, or precision-measurement systems
• Deep hands-on experience designing, operating, or improving complex AMO or coherent-control experiments, with strong knowledge of atom-light interactions and technologies such as lasers, optical systems, acousto-optic or electro-optic modulators, RF instrumentation, and ultra-high-vacuum systems
• Proficiency with Python for experiment control, data analysis, automation, or hardware integration, plus working knowledge of Linux, command-line tools, and version control
• Demonstrated ability to turn ambiguous technical goals into executable plans and validated outcomes, lead system-level work across disciplines, and communicate effectively with specialist and non-specialist audiences

It is a plus if you have:

• Experience with neutral-atom quantum computing, Rydberg physics, optical-tweezer arrays, quantum-gate characterization and optimization, or related processor architectures; familiarity with physical error mechanisms and quantum-error-correction requirements
• Experience with advanced laser and optical systems, including short-wavelength lasers, beam delivery and shaping, optical projection, high-NA imaging, noise mitigation, feedback control, and subsystem stabilization
• Experience integrating optical, electronic, vacuum, control, and software subsystems into complex experimental platforms
• Demonstrated technical leadership through mentoring, cross-team coordination, and delivery of complex technical programs; experience contributing to proposals, patents, roadmaps, customer discussions, or government-funded R&D

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 authorization to receive software or technology controlled under these U.S. export control laws and regulations without sponsorship for an export license.

WORKING CONDITIONS And PHYSICAL REQUIREMENTS

Work will normally be performed in an office and laboratory environment and around technical equipment including computers and lasers. We ask that candidates be able to efficiently use automated office equipment such as laptops, copiers, and printers; able to effectively engage in communications (via phone, computer, or in-person). Any required Personal Protective Equipment will be provided and must be properly used in accordance with company requirements.

TRAVEL

Up to 10% travel may be required.

Benefits

The targeted salary range for this role is $166,000 to $256,000 on an annualized basis plus eligibility to participate in our annual incentive plan.

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

• 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

Equal Opportunity

Here you have freedom to embrace your whole self: who you love, your gender identity and expression, skin color, 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.

Contact Information

For disability accommodations, please feel free to contact us at [e-mail].