2 Postdoc Positions in Experimental Atomic Physics
University of Amsterdam, Faculty of Science – Institute of Physics

2 Postdoc positions in experimental atomic physics

Faculty of Science – Institute of Physics

Publication date
24 August 2018

Level of education

Salary indication
€2,640 to €4,166 gross per month

Closing date
31 December 2018

38 hours per week

Vacancy number


We are looking for two highly-motivated Postdocs with excellent laboratory skills for performing state-of-the-art atomic physics experiments within the Quantum Flagship project iqClock.


The strontium quantum gases group, headed by Prof. Florian Schreck, is part of the Quantum Gases and Quantum Information (QG&QI) cluster at the University of Amsterdam. The main focus of the group is the exploitation of Sr quantum gases for novel precision measurement techniques and the study of many-body physics.


Project description

In the project you will develop a new type of optical clock: a continuously operating superradiant clock. Optical clocks exploit mHz linewidth transitions of atoms as frequency references and can achieve an accuracy that corresponds to going one second wrong over the lifetime of the universe (10-18). Conventional clocks operate by stabilizing a laser on the atomic clock transition and reading out the laser by using an optical frequency comb. The interrogated atoms have to be extremely cold in order for the Doppler effect not to distort the measurement. Preparing a sample of atoms at ultracold temperatures takes time. To bridge that time the clock laser is short-term stabilized on a cavity.


Here we want to improve and simplify the clock by creating a laser from direct emission of light on the clock transition. Since the transition is so narrow an atom will spontaneously emit a photon only every minute or so, which doesn’t give us enough photons to do anything with. To enhance emission we use superradiance. By making it impossible to know which atom in an ensemble emitted a photon, the ensemble will enter a superposition state that is more likely to emit another photon, creating an avalanche effect and usually resulting in a “superradiant” flash of light [1]. The main challenge of this project is to prolong this flash to eternity by feeding new atoms into the superradiantly lasing ensemble. This is challenging since the light used to laser cool the atoms from room temperature to the microKelvin regime decoherers the superradiantly lasing ensemble. This challenge can be solved using a new technique that we have developed over the last years in another project that has the goal to build a continuous atom laser [2]. We are able to create the Sr atomic beams with unprecedented brilliance and steady-state Sr samples close to quantum degeneracy. Crucially, this beam of ultracold Sr atoms is available in a region with very little laser cooling straylight, an important ingredient in feeding a superradiantly lasing ensemble forever.


This project has three parts. In one part we will create a superradiant laser on a kHz line transition, collaborating with the group of Jan Thomsen in Copenhagen. In the second part we’ll attempt to build a superradiant clock on the mHz line of Sr together with the group of Michał Zawada in Torun. The third part will be the exploration of the foundations of superradiant lasing in Amsterdam. Our ideas for this part range from the study of many-body effects in driven-interacting systems to cavity-cooling of a stream of atoms to quantum degeneracy, forming a continuous atom laser. The work will be executed in a team of two PhD students, another postdoc, Florian Schreck and an extensive network of collaborators.


We also expect you to assist in guiding PhD students and master students.



[1] Matthew A. Norcia, Matthew N. Winchester, Julia R. K. Cline and James K. Thompson,Superradiance on the millihertz linewidth strontium clock transition, Science Advances 2, e1601231 (2016).

[2] Shayne Bennetts, Chun-Chia Chen (陳俊嘉), Benjamin Pasquiou, and Florian Schreck, Steady-State Magneto-Optical Trap with 100-Fold Improved Phase-Space Density, Phys. Rev. Lett. 119, 223202 (2017).



You hold a PhD in physics or a related field and are requested to motivate why you apply for the position and to supply a CV.


Other skills/experiences/documents that would benefit your application are:

  • previous laboratory experience in an atomic physics lab;

  • working knowledge of a programming language (matlab, C++ or equivalent);

  • excellent English oral and written communication skills;

  • scientific publications.

To foster diversity in our research group, we will especially appreciate applications from excellent female candidates.


Further information

For informal enquiries about the position please contact:

  • Florian Schreck

You may find more information on this project on:

  • iqClock - Integrated Quantum Clock



The appointment will be on a temporary basis for the period of two to maximum three years (initial appointment will be for a period of 12 months and after satisfactory evaluation it can be extended).


The monthly gross salary will range between €2,640 and €4,166 (scale 10), based on a full-time appointment. We offer a pension scheme, a holiday allowance of 8% per year, an end-of-year bonus of 8,3% and flexible employment conditions. Conditions are based on the Collective Labour Agreement for Dutch Universities. Favourable tax agreements may apply to non-Dutch applicants.


Job application

The UvA is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We value a spirit of enquiry and endurance, provide the space to keep asking questions and cherish a diverse atmosphere of curiosity and creativity. 


You may apply using the link below. Your application must include:

  • a curriculum vitae;

  • a motivation letter that explains why you have chosen to apply for this specific position with a statement of your research experience and interests and how these relate to this project;

  • title and summary of your PhD thesis.


Please make sure all your material is attached in only one pdf. The single pdf can be uploaded in the field marked CV in the application form.


We will consider applications as they are received with flexible starting dates, and the positions will remain open until two suitable candidates have been identified (Formal closing date is 31 December 2018). #LI-DNP

If you apply for this position please say you saw it on Physicaloxy


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