Principal Physicist

Superlinear Computing · Palo Alto, CA · Full-time

Superlinear Computing is a quantum research and infrastructure company headquartered in Palo Alto. We design, deploy, and operate on-premises superconducting QPU systems, apply machine learning to characterize quantum system behavior, and translate those findings into specialized hardware products.

We work at the frontier of quantum hardware and real-world applications, giving researchers, enterprises, and government partners access to quantum capabilities that were previously out of reach. We believe the transition to quantum computing will be defined not just by the machines themselves, but by the infrastructure built around them.

The Role

This is the physics role at Superlinear Computing. You will own the physical understanding of every system we operate or build, including superconducting QPUs today, and of entropy sources spanning optical and semiconductor hardware, as our roadmap develops. You work alongside our electronics engineers, setting the physical parameters and theoretical foundations for their implementations. The role is senior, independent, and self-directed. The scope grows with the company.

• Own QPU performance across all systems: calibration, characterization, benchmarking, and diagnosis
• Investigate hardware at the physics level, coherence dynamics, noise sources, gate error mechanisms
• Design and validate entropy sources across hardware modalities: optical, semiconductor, and superconducting
• Define physical figures of merit and characterization targets for ML-driven analysis of quantum output streams
• Collaborate with electronics and software engineers on calibration automation and system integration
• Surface and pursue research directions that emerge from operating real hardware across all system types

Required

• PhD in experimental physics or quantum engineering
• Hands-on superconducting qubit characterization: spectroscopy, Rabi, Ramsey, T₁/T₂, randomized benchmarking, two-qubit gate tune-up
• Working knowledge of microwave measurement: IQ mixing, heterodyne readout, pulse shaping

Preferred

• Dilution refrigerator experience at the operator level
• Rigetti hardware, pyQuil, or equivalent gate-level SDK familiarity
• Exposure to automated calibration frameworks (QuantrolOx, QUAlibrate, Q-CTRL, or similar)
• Depth in TLS physics, flux noise, readout optimization, or crosstalk characterization

What We Offer

• Direct access to on-premises superconducting QPU hardware at the Illinois Quantum and Microelectronics Park, the kind of access most researchers only find at national labs
• Small, rigorous team, your technical judgment shapes outcomes directly
• Competitive salary, equity, and full benefits
• Travel to IQMP as needed for system operation and characterization

This is a senior individual contributor role with real strategic weight. The Principal Physicist is the translation layer between what Superlinear Computing envisions and where the boundaries of the physical world are still being drawn.