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Infleqtion is a global quantum technology company developing quantum computers, sensors, and networks. The Quantum Spectrum (QRF) team builds fieldable radio-frequency sensing systems based on Rydberg atoms, combining atomic physics, lasers, photonics, RF electronics, embedded controls, and precision hardware.
You will establish and own the RF and electromagnetics discipline within the QRF team, reporting to the QRF Product Engineer. This is a hands-on role centered on calibrated electromagnetic field generation and delivery, sensor interfaces, low-noise signal chains, RF structures, and traceable measurement—not conventional communications modem or protocol design.
Key responsibilities include:
- Own RF and electromagnetic requirements, architectures, interfaces, performance budgets, and verification methods for sensor heads, test systems, and integrated hardware
- Design, simulate, build, and characterize RF structures (electrodes, resonators, antennas, fixtures, interconnects, shielding, field delivery hardware)
- Develop RF signal generation, amplification, filtering, frequency conversion, and analog interface approaches for broadband sensor operations
- Build and improve controlled conducted and radiated RF test environments with field generation, mapping, and calibration
- Define and execute measurements for field strength, frequency response, impedance, insertion/return loss, phase, coupling, shielding, noise, linearity, dynamic range, and spurious response
- Build and maintain RF performance budgets for gain, loss, noise, phase noise, leakage, coupling, compression, harmonics, and spurious signals
- Lead RF hardware bring-up, characterization, troubleshooting, and root-cause analysis across benchtop, subsystem, and integrated configurations
- Use electromagnetic and circuit simulation (HFSS, CST, ADS, AWR, COMSOL, FEKO) to guide design, component selection, and interpretation of results
- Develop Python or comparable automation for instrument control, parameter sweeps, calibration, regression testing, and data analysis
- Collaborate with applied physicists to relate RF field delivery and signal-chain behavior to atomic response, sensitivity, bandwidth, stability, and repeatability
- Work across optical-mechanical, electrical, embedded-systems, software, manufacturing, and technician teams to define interfaces and resolve cross-domain problems
- Document designs, models, interfaces, calibration methods, test procedures, and trade studies for technical reviews and verification
Required qualifications:
- Bachelor's degree in electrical engineering, applied physics, electromagnetics, or closely related field (or equivalent practical experience)
- At least 5 years of professional experience in RF, microwave, electromagnetics, antenna, advanced sensor, or related hardware development
- Demonstrated experience independently designing, building, integrating, characterizing, and troubleshooting RF or microwave hardware and test systems
- Hands-on laboratory experience with vector network analyzers, spectrum/vector-signal analyzers, signal generators, oscilloscopes, power meters, and RF probes
- Practical knowledge of impedance matching, gain/loss, noise, dynamic range, linearity, phase noise, spurious response, leakage, coupling, shielding, grounding, and measurement uncertainty
- Experience developing RF requirements, signal-chain budgets, test methods, calibration approaches, and quantitative acceptance criteria
- Experience with RF, circuit, or electromagnetic simulation tools
- Experience with Python, MATLAB, LabVIEW, or comparable environments for instrument control, test automation, modeling, or data analysis
- Ability to own the RF domain, document technical work clearly, collaborate across disciplines, and learn atomic physics and Rydberg sensing concepts
Preferred: Experience with Rydberg atoms, electromagnetically induced transparency, atomic RF electrometry, quantum sensing, atomic clocks, or related atomic physics instrumentation; experience with calibrated free-space or radiated RF measurement and field mapping.
