Quantum Physicist
Infleqtion
Quantum Physicist
Infleqtion
Full-stack quantum hardware and software
Infleqtion · Louisville, United States · Full-time · Posted 2026-10-16
Salary: USD 135,000–175,000
Workplace: on_site
Department: Quantum Computing
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.
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.
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Full-stack quantum hardware and software
Infleqtion develops neutral-atom quantum hardware and software for computing, sensing, and security. Its hardware uses lasers to cool and trap neutral atoms to perform quantum operations, with products like the Sqale quantum processor, Tiqker optical atomic clocks, quantum RF receivers, and inertial sensors. The software is Superstaq, a hardware-agnostic compiler that optimizes quantum algorithms for execution on different quantum devices, potentially improving performance for some workloads. The company differentiates itself through vertical integration of core hardware and software and by pursuing a broad neutral-atom platform, serving government and commercial customers with a goal of accelerating practical quantum adoption and expanding its addressable markets.
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