A PhD position is available in the group of Prof. Stefan Willitsch at the University of Basel (Switzerland) on the development of quantum technologies for single trapped molecular ions and their application in precision spectroscopy.

Project description

In recent years, impressive advances in the quantum control of ultracold atoms and atomic ions have been achieved which enabled measurements with an unprecedented precision. Similarly precise experiments on molecules open up a range of new scientific perspectives owing to their rich level structure combining rotational and vibrational degrees of freedom. These include tests of new physical concepts, the implementation of new frequency standards, accurate evaluations of physical theories such as quantum electrodynamics and precise determinations of fundamental constants. They also lay the foundations for applications of molecules in the realm of modern quantum science such as quantum information and quantum sensing.  

We have recently developed a new experimental approach enabling the readout and coherent manipulation of the quantum state of a single trapped molecular ion without destroying the molecule and indeed its quantum state itself. In the present project, the potential of this new method will be harnessed to perform highly sensitive and precise spectroscopic measurements on single molecules. In the project, we will introduce completely new approaches to molecular spectroscopy, further develop quantum technologies for molecular systems and establish new limits for the measurement precision of trapped molecules. 

Further informations and applications

For further information, please refer to recent publications, e.g.,

• M. Sinhal et al., "Quantum non-demolition state detection and spectroscopy of single trapped molecules”, Science 367 (2020), 1213 
• M. Deiß, S. Willitsch and J. H. Denschlag, "Cold trapped molecular ions and hybrid platforms for ions and neutral particles”, Nat. Phys. 20 (2024), 713
• A. Shlykov et al., “Quantum-logic spectroscopy of forbidden vibrational transitions in single nitrogen molecular ions”, arXiv 2603.10553 (2026)

consult the group’s website at www.coldions.chemie.unibas.ch or contact Prof. Stefan Willitsch.

Applicants should have a MSc degree in physics or physical chemistry, preferably with experience in experimental quantum science, quantum optics or spectroscopy. The PhD positions will be embedded in the Basel PhD program on “Quantum Computing and Quantum Technology” (QCQT, https://phdschoolqcqt.unibas.ch/en/), the new Swiss National Competence Center for Research “Precision” (www.nccr-precision.ch) and the Basel Quantum Center (www.quantum.unibas.ch).

Inquiries and applications should be sent to Prof. Stefan Willitsch (stefan.willitsch@unibas.ch) and include a cover letter, a curriculum vitae, a list of publications, transcripts of degree certificates and the contact details of at least two referees. Applications are accepted until the position has been filled.

Undergraduate projects, master theses, PhD and postdoc positions

We are always looking for new members to join our group. If you are interested in an undergraduate project (Wahlpraktikum) or master thesis in our group, or would like to join as a Ph.D. student or postdoc, please contact Stefan Willitsch. We offer a vibrant and friendly research atmosphere in an exciting, highly interdisciplinary scientific field at the interface between chemistry and physics, the possibility to participate in international research collaborations, state-of-the-art laboratories and an excellent infrastructure.
Candidates should have degrees in chemistry or physics. Applications for PhD and postdoc positions should include a curriculum vitae, a letter of motivation, the contact details of at least two referees and a list of publications. PhD applicants should also include transcripts of their academic records.