Quantum Physicist (Quantum Computing)

Infleqtion, Inc.; Madison (WI); On-site; USD 125,000 - 160,000; Full time

Benefits offered by this job

Unlimited PTO

401(k) match

HSA

Life and AD&D Insurance

Equity program

Paid FMLA

Job summary

Infleqtion, Inc. is seeking a highly motivated physicist to design, build, and optimize neutral-atom quantum computing systems. You will run R&D projects on quantum hardware, laser and optical systems, and subsystem integration, translating goals into actionable experimental plans.

The role requires hands-on experience with atomic/optical/quantum experiments, Python tooling for control and data analysis, and the ability to guide junior team members in a fast-paced, collaborative environment.

Qualifications

• PhD in atomic, optical, AMO, quantum physics or related field; or 4+ years of relevant research experience.
• Hands-on experience with atomic/optical/quantum experiments and precision measurement.
• Experience applying quantitative models to experimental design and hardware specs.

Responsibilities

• Design, build, calibrate, operate, and improve neutral-atom quantum computing systems.
• Execute R&D projects involving quantum processor hardware and laser systems.
• Translate goals into experimental plans and measurable performance targets.
• Design and analyze experiments and physics-based models to guide decisions.
• Independently execute well-defined technical work from planning to validation.
• Develop Python-based tools for experiment control, data analysis, and automation.
• Own assigned subsystems through testing, maintenance, and documentation.
• Collaborate with physics, software, electrical, mechanical, and systems teams.
• Provide technical guidance to junior team members and interns.

Skills

Python for experiment control

Experiment design & data analysis

Cross-disciplinary collaboration

Problem solving

Education

PhD in atomic, optical, AMO, quantum physics, or related field

Four years of comparable research or professional experience

Tools

Lasers and optical systems

RF instrumentation

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

• Design, build, calibrate, operate, and improve neutral-atom quantum computing systems and subsystems.
• Execute R&D projects involving quantum processor hardware, quantum-gate protocols, laser and optical systems, calibration, control, or system integration.
• Translate defined technical goals into experimental plans, subsystem requirements, and measurable performance targets.
• Design and analyze experiments and physics-based models to understand system behavior and guide technical decisions.
• Independently execute well-defined technical work from planning through implementation and validation.
• Develop Python-based tools for experiment control, data analysis, calibration, automation, and hardware integration.
• Own assigned subsystems through testing, troubleshooting, maintenance, documentation, and routine operation.
• Collaborate with physics, software, electrical, mechanical, and systems-engineering teams.
• Provide technical guidance to junior team members and supervise interns as appropriate.
• PhD in atomic, optical, AMO, quantum physics, or a related field, or at least four years of comparable research or professional experience.
• Hands‑on experience conducting experiments involving atomic, optical, quantum, or precision‑measurement systems.
• Experience applying quantitative atomic or optical physics models to experimental design or to the specification of laser, optical, RF, or control systems.
• Hands‑on experience with lasers and optical systems, together with related technologies such as acousto‑optic or electro‑optic modulators, RF instrumentation, imaging systems, or ultra‑high‑vacuum equipment.
• Experience using Python for experiment control, data analysis, automation, or hardware integration.
• Evidence of designing and analyzing physics experiments or developing an experimental subsystem.

It is a plus if you have:

• Experience with neutral atoms, trapped ions, Rydberg physics, optical tweezers, quantum-gate protocols, or another coherent‑control platform.
• Experience with high‑power or short‑wavelength lasers and optical power‑delivery systems.
• Experience characterizing or mitigating laser‑frequency, phase, pointing, or intensity noise.
• Experience with analog electronics, RF systems, or feedback control.
• Experience with high‑numerical‑aperture imaging, beam shaping, or optical projection.
• Experience integrating optical, electronic, vacuum, control, and software subsystems.
• Familiarity with Linux, Git, command‑line tools, and collaborative software‑development practices.

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.

NOTE

Infleqtion does not accept unsolicited resumes from agencies. Infleqtion is not responsible for any fees related to unsolicited resumes.

Notice to Recruitment Agencies

Infleqtion does not accept unsolicited resumes from agencies. Infleqtion is not responsible for any fees related to unsolicited resumes.

• Salary Range: per year 125,000 - 160,000
• 100% company‑paid medical, dental, vision, short/long‑term disability
• Employer‑funded Health Savings Account
• Unlimited PTO
• 401(k) match
• Company‑paid Life and AD&D Insurance
• Flexible Savings Account
• Paid FMLA, Maternity/Paternity Leave
• Employee Assistance Program
• Student Loan Repayment
• Equity Program