Quantum Systems Engineer at PsiQuantum · Daresbury

PsiQuantum’s mission is to build the first useful quantum computers—machines capable of delivering the breakthroughs the field has long promised. Since our founding in 2016, our singular focus has been to build and deploy million-qubit, fault-tolerant quantum systems. Quantum computers harness the laws of quantum mechanics to solve problems that even the most advanced supercomputers or AI systems will never reach. Their impact will span energy, pharmaceuticals, finance, agriculture, transportation, materials, and other foundational industries. Our architecture and approach is based on silicon photonics. By leveraging the advanced semiconductor manufacturing industry—including partners like GlobalFoundries—we use the same high-volume processes that already produce billions of chips for telecom and consumer electronics. Photonics offers natural advantages for scale: photons don’t feel heat, are immune to electromagnetic interference, and integrate with existing cryogenic cooling and standard fiber-optic infrastructure. In 2024, PsiQuantum announced government-funded projects to support the build-out of our first utility-scale quantum computers in Brisbane, Australia, and Chicago, Illinois. These initiatives reflect a growing recognition that quantum computing will be strategically and economically defining—and that now is the time to scale. PsiQuantum also develops the algorithms and software needed to make these systems commercially valuable. Our application, software, and industry teams work directly with leading Fortune 500 companies—including Lockheed Martin, Mercedes-Benz, Boehringer Ingelheim, and Mitsubishi Chemical—to prepare quantum solutions for real-world impact. Quantum computing is not an extension of classical computing. It represents a fundamental shift—and a path to mastering challenges that cannot be solved any other way. The potential is enormous, and we have a clear path to make it real. Come join us. Job Summary: PsiQuantum is looking for a Quantum Systems Engineer to design, build, and validate quantum subsystems for our photonic quantum computing platform. This role focuses on implementing and testing key quantum optical experiments and subsystems, contributing directly to the realization of fault-tolerant quantum computation. You will work across disciplines to integrate and validate system-level performance. Responsibilities: Design, build, and test quantum photonic subsystems and experiments. Implement and analyse quantum interference experiments, including Hong-Ou-Mandel measurements. Develop and validate systems involving single-photon sources and detectors. Perform time-tagged measurements and analyse photon correlation data. Contribute to the development and testing of entangling circuits and quantum state preparation. Collaborate with cross-functional teams to integrate subsystems into larger quantum architectures. Debug complex experimental systems and identify performance limitations. Document and communicate experimental results to inform system design improvements. Experience/Qualifications: PhD in Quantum Physics, Quantum Optics, or a related discipline. Strong experimental experience in quantum optics or photonic quantum systems. Hands-on experience with Hong-Ou-Mandel interference and related quantum optics experiments. Familiarity with single-photon sources, detectors, and time-tagging techniques. Strong data analysis and experimental design skills. Desired Skills: Experience with entangling circuits and single-qubit readout techniques. Knowledge of quantum information concepts and photonic quantum architectures. Experience with experimental automation and data processing (e.g., Python). Ability to work effectively in cross-disciplinary teams. PsiQuantum provides equal employment opportunity for all applicants and employees. PsiQuantum does not unlawfully discriminate on the basis of race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), gender identity, gender expression, national origin, ancestry, citizenship, age, physical or mental disability, military or veteran status, marital status, domestic partner status, sexual orientation, genetic information, or any other basis protected by applicable laws. Note: PsiQuantum will only reach out to you using an official PsiQuantum email address and will never ask you for bank account information as part of the interview process. Please report any suspicious activity to recruiting@psiquantum.com. We are not accepting unsolicited resumes from employment agencies. The ranges below reflect the target ranges for a new hire base salary. Actual compensation may vary outside of these ranges and is dependent on various factors including but not limited to a candidate's qualifications including relevant education and training, competencies, experience, geographic location, and business needs. Base pay is only one part of the total compensation package. Full time roles are eligible for equity and benefits. Base pay is subject to change and may be modified in the future. Daresbury, United Kingdom £63,000—£70,000 GBP