Quantum Physicist (Quantum Computing)

Infleqtion, Inc.; Louisville (CO); On-site; USD 135,000 - 170,000; Full time

Benefits offered by this job

Medical coverage (100% company-paid)

Dental & vision coverage

Unlimited PTO

401(k) match

Life and AD&D insurance

Flexible Savings Account

Paid FMLA / parental leave

Employee Assistance Program

Student loan repayment

Equity program

Job summary

Infleqtion, Inc. is advancing atom-based quantum technologies, seeking physicists with AMO expertise to design and operate neutral-atom quantum systems in a fast‑paced, highly collaborative environment.

The role focuses on building and improving quantum hardware, running experiments, and developing Python tools for automation and data analysis, with opportunities to mentor interns and influence subsystem design.

Qualifications

• PhD in atomic/optical/AMO/quantum physics 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/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 and related technologies (AO/EO modulators, RF instrumentation, imaging, or vacuum equipment).
• Experience using Python for experiment control, data analysis, automation, or hardware integration.

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.

Skills

Python

Experiment control

Data analysis

Calibration

Automation

Hardware integration

Education

PhD in atomic/optical/AMO/quantum physics

Tools

Linux

Git

Command-line tools

RF instrumentation

Imaging systems

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.

If you are overqualified for this role, consider applying to our senior-level role

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.

• Salary Range: per year 135,000 - 170,000
• 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