Remuneration Group 13 TVöD Bund o Three-year fixed term o Part-time (33.You will support us by performing the following activities: Automating clock operation for the two clock transitions of 173Yb+ Investigating stability improvement by simultaneously interrogating multiple ions by various means, including entanglement Developing protocols for investigating and using the hyperfine transitions of 173Yb+ ions Determining systematic frequency shifts for the two clock transitions and drawing up an uncertainty budget Expanding the existing Python-based experimental control system with ARTIQ Enhancing existing laser setups Performing, evaluating, and analyzing comparison measurements with other optical clocks to verify the systematic uncertainties and to identify violations of the equivalence principle and other effects beyond the standard model Presenting the research results at international conferences and in scientific journals Your profile: You have completed your university studies (master's degree or German Diplom) in physics with an overall grade of «very good» or the equivalent for non-German degrees. You ideally possess knowledge and experience in the following fields: atomic physics, atom-light interaction, laser cooling of atoms, laser spectroscopy, experimental optics, automated data acquisition, electronics and programming. You are highly committed and capable of working independently You are a strong team player with excellent communication skills. You have achieved C1 level in English. German language skills would be an advantage. You will carry out research as part of an internationally renowned team and will benefit from PTB's excellent infrastructure. Our support program for doctoral candidates additionally gives you the opportunity to network with your peers at the national and international levels, for example, at scientific conferences. We offer flexible working arrangements and conditions (part time, flextime, work from home, telework, compensation days) to help you manage your family, care and career responsibilities in all of life's phases. Remuneration in accordance with Germany's collective agreement for federal-level public service employees (TVöD Bund), 30 days of paid vacation and an employment-based pension plan for employees covered by the collective agreement are just some of the benefits of working at PTB. Location benefits: Our attractive campus offers an easy commute for drivers and cyclists as well as very good direct bus services. Plenty of free parking is available. Jobticket: We take environmental and climate protection seriously. To encourage commuting by public transportation, we offer a subsidy towards the cost of the Deutschlandticket Job. From daycare and dedicated parent-child offices to school holiday childcare, we offer a variety of ways to help you master the family-work balancing act. Learning opportunities: We want to help you get ahead by offering a wide range of training and development programs to expand and enhance your skills. Your health is important to us, which is why we offer health promotion and maintenance programs, including workplace sports, a mobile massage service and back care classes. Canteen: Situated on our park-like campus grounds, our canteen offers a wide variety of culinary choices every day, including vegetarian/vegan options. We look forward to receiving your online application by 18 September 2025 under Ref. Please click on the following button: online application. Physikalisch-Technische Bundesanstalt (PTB) | Referat Personal | Bundesallee 100 | 38116 BraunschweigPhysik Physik Doktorand, Doktorandin Lehre & Forschung, Wissenschaft Forschungseinrichtung Teilzeit