University of California

What you'll study

This PhD programme is built around independent, original research in areas that bridge optics, photochemistry, quantum chemistry and materials science. Early in the degree you take advanced coursework to consolidate foundations and acquire specialised methods; subsequently you focus on a supervised research project leading to a doctoral dissertation.

• Core topics: quantum mechanics and electronic structure theory, molecular spectroscopy, optical and nonlinear optics, quantum dynamics and decoherence, photochemistry and excited-state processes.
• Experimental streams: ultrafast spectroscopy, single‑molecule and single‑photon detection, laser development, integrated photonics and cryogenic quantum optics.
• Theoretical/computational streams: ab initio methods, density functional theory, multireference methods, quantum dynamics simulations, quantum information approaches to chemistry and photonic modelling.
• Methods and tools: time‑resolved spectroscopy, pump–probe and 2D spectroscopy techniques, femtosecond lasers, quantum optics instrumentation, high-performance computing and software for electronic structure and dynamics.
• Programme structure: taught and seminar courses in the first one to two years, qualifying/ comprehensive examinations or other milestone assessments, regular research group meetings, teaching or mentoring responsibilities, and completion and defence of an original research thesis.
• Interdisciplinary opportunities: collaborations across physics, electrical engineering, materials science and computer science enable projects in quantum materials, photonic devices, quantum sensing and computational method development.

Entry requirements

Successful applicants typically hold a bachelor’s degree with honours or a relevant master’s degree in chemistry, physics, chemical engineering or a closely related discipline and demonstrate strong performance in advanced physical chemistry and mathematics. Admissions committees look for evidence of quantitative aptitude and research potential.

• Academic record showing strength in physical chemistry, quantum mechanics and/or optics.
• Research experience in a laboratory or theoretical group, ideally with a clearly described project or publications/preprints where applicable.
• Letters of recommendation (usually three) from academic or research supervisors who can speak to research ability and potential for doctoral work.
• A statement of purpose outlining research interests, potential faculty collaborators and reasons for pursuing the PhD.
• Curriculum vitae listing research, technical skills (e.g. spectroscopy, laser safety, programming languages), and relevant coursework.
• Proof of English language proficiency for applicants whose first language is not English, in line with university requirements.

Career prospects

Graduates from this field are in demand across multiple sectors that exploit quantum and photonic technologies. Career paths typically pursued include:

• Academic research and teaching — postdoctoral positions leading to faculty roles in chemistry, physics or interdisciplinary departments.
• National and government research laboratories — roles in experimental and theoretical groups working on quantum sensors, photonics and materials.
• Quantum technology and photonics industry — positions in companies developing quantum computing hardware, quantum communications, single‑photon detectors, lasers and integrated photonic devices.
• Materials and semiconductor industry — R&D in novel optoelectronic materials, solar energy conversion and nanophotonics.
• Computational and software roles — development of electronic structure codes, machine‑learning models for materials discovery and simulation tools.
• Consulting, intellectual property and science policy — technical advisory roles where deep subject knowledge in optics and quantum chemistry is valued.

Why study at University of California

The University of California offers a research-intensive environment with world-class faculty in physical chemistry, optics and quantum science and access to sophisticated experimental and computational facilities. Students benefit from interdisciplinary centres and collaborations across departments, exposure to regional innovation ecosystems, and opportunities to work alongside industry partners and research consortia.

Doctoral candidates gain mentorship from established researchers, access to advanced instrumentation and high‑performance computing resources, and a vibrant graduate community. The programme emphasises original research, technical training and professional development to prepare graduates for leadership roles in science and technology.