Job offers

Applications for internships, bachelor's or master's theses as well as PhD and PostDoc candidates are welcome at any time.

Please contact the responsible person for each research project

Quantum Logic SpectroscopyProf. Dr. Piet O. Schmidt
Quantum Clocks and Complex SystemsProf. Dr. Tanja E. Mehlstäubler
Trapped-Ion Quantum EngineeringProf. Dr. Christian Ospelkaus

 

 

 

 

 

Open Positions

Highly charged ions (HCIs) are ubiquitous in the observable universe and have many advantageous properties for fundamental physics tests and use as next-generation optical clocks. Building on our recent breakthrough in the clock-like laser spectroscopy of highly charged ions with a precision jump of nine orders of magnitude, the following tasks will be pursued:

  • Working with our team to install and characterize an improved ion trap based on precision-machined wafer technology to further improve the performance of the system

  • Developing quantum logic search techniques to enable the rapid localization and identification of narrow optical transitions in HCIs

  • Performing optical frequency measurements at the technological limit and analyzing isotopic shift data with respect to the exclusion of 5th forces

 

The post is initially limited to three years; an extension of the contract is possible. You will be employed at our Braunschweig site. The remuneration will be paid in accordance with remuneration group 13 TVöD Bund.

 

We offer:

  • An excellent research environment with access to PTB’s unique infrastructure

  • Hands-on training in modern experimental techniques in laser and quantum physics and active participation in the development of experiments at the forefront of quantum physics research

  • The opportunity to present scientific results at international conferences

  • We support research trips abroad in cooperation with our international partners

Your profile:

  • You have completed your university studies (diploma/master’s) in physics with a very good degree; a doctorate would be an advantage

  • You are interested in developing and performing high-precision experiments

  • You have a high level of commitment, you work well both independently and in a team, and you have a willingness to learn

  • You are a strong team player with excellent communication skills

  • You have a very good command of both spoken and written German and English

  • Having a good knowledge of atomic physics, quantum optics, laser cooling, laser spectroscopy, or related fields is an advantage

  • The physical ability to work in a laboratory and to perform experiments at external sites is required

Project Website

Flyer

If you are interested, please contact Prof. Dr. Piet O. Schmidt

The advertised position will deal with high precision spectroscopy of one of the following systems:

Aluminium - Calcium quantum logic clock for high frequency accuracy

  • Continued development with focus on automation and frequency comparison with other clocks

Calcium multi-ion clock for novel interrogation schemes

  • Investigation of multi-ion clock properties
  • Development of entanglement enhanced interrogation schemes


The post is initially limited to three years; an extension of the contract is possible. You will be employed at our
Braunschweig site. The remuneration will be paid in accordance with remuneration group 13 TVöD Bund (85 %).

We offer:

  • An excellent research environment (DQ-mat CRC 1227, Excellence Cluster 2123) with access to PTB's unique infrastructure
  • Possibility to present scientific results at international conferences
  • We encourage research stays abroad with our international collaborators

Your profile:

  • You have obtained an excellent university degree in physics
  • You are interested in developing and realising precision experiments
  • You are highly committed and capable of working both autonomously and together as part of a team, and you are willing to improve your skills
  • You are a team player and have good communication skills
  • Sound knowledge of atomic physics and experience in the field of quantum optics, laser cooling, laser
    spectroscopy or related subjects is advantageous
  • You have the physical ability to work in a laboratory and to perform experiments outside the institute

Flyer

If you are interested, please contact Prof. Dr. Piet O. Schmidt

In the research group "Quantum Logic Spectroscopy" we deal with precision spectroscopy of trapped and laser-cooled atomic ions. Therefore, we develop quantum computer-inspired techniques for the coherent manipulation of ions and their spectroscopy for applications such as high-precision optical atomic clocks.

Your tasks:

  • Development of compact optical setups with automated optimisation of operating parameters

  • Integration of the resulting hardware in a transportable Al+ quantum logic clock

  • Participation in the automation of the clock for continuous operation and characterisation of the clock

  • Participation in in-field measurement campaigns outside the laboratory environment for relativistic geodesy

The post is initially limited to three years; an extension of the contract is possible. You will be employed at our
Hannover site in the brand-new HITec lab building. The remuneration will be paid in accordance with remuneration group 13 TVöD Bund (85 %).

We offer:

  • An excellent research environment (DQ-mat CRC 1227, Excellence Cluster 2123) with access to PTB's unique infrastructure [TODO!]
  • Practical training in modern experimental techniques in laser and quantum physics and active participation in the development of experiments at the forefront of quantum physics research.
  • Possibility to present scientific results at international conferences
  • We encourage research stays abroad with our international collaborators

Your profile:

  • You have obtained an excellent university degree in physics
  • You are interested in developing and realising precision experiments
  • You are highly committed and capable of working both autonomously and together as part of a team, and you are willing to improve your skills
  • You are a team player and have good communication skills
  • Sound knowledge of atomic physics and experience in the field of quantum optics, laser cooling, laser
    spectroscopy or related subjects is advantageous
  • You have the physical ability to work in a laboratory and to perform experiments outside the institute

Flyer

If you are interested, please contact Prof. Dr. Piet O. Schmidt

In unserem Labor entwickeln wir eine optische Atomuhr, bei der die Frequenz eines Lasers mit der
Energiedifferenz zweier Quantenzustände (Referenz) von 40Ca+ verglichen und anschließend darauf
stabilisiert wird. Insbesondere fokussieren wir uns dabei auf die Möglichkeit durch die gezielte
Manipulation dieser Quantenzustände den Messprozess zu verbessern und dadurch die Stabilität
unserer Atomuhr zu erhöhen. Mithilfe von Verfahren wie die Verschränkung mehrerer Ionen oder die
Entkopplung der Quantenzustände von externen Störungen (Dynamical Decoupling) lassen sich die
Sensitivität des Messsignals und die Messdauer bei der Abfrage vergrößern. Auch das gleichzeitige
Abfragen vieler atomarer Zustände in einem Ionenkristall dient einer verbesserten Sensitivität, da in
gleicher Zeit mehr Informationen aus dem System ausgelesen werden können. Mit steigender Anzahl an
Ionen entstehen immer mehr Störungen in dem Quantensystem. Dadurch wird ein hohes Maß an
Kontrolle der Ionen in unserer Paul-Falle erfordert und die Messung an speziell konstruierte
Quantenzustände durchgeführt.

Mögliche Aufgabenfelder:

  • Charakterisierung der Temperatur und der Stabilität von Ionenkristallen
  • Programmierung und Entwicklung von Messequenzen und Auswertung mit Python (ARTIQ)


Ihr Profil:

  • Interesse an Laserphysik, Atomphysik und Quantenoptik
  • Hohes Engagement, eigenverantwortliches Arbeiten sowie Lernbereitschaft
  • Team und Kommunikationsfähigkeit

Flyer

Bei Interesse bitte Prof. Dr. P. O. Schmidt kontaktieren.

In unserem Labor an der PTB in Braunschweig ist ab sofort eine Masterarbeit zu vergeben.

In unserem Experiment werden hochgeladene Ionen (HCI), z.B. Ar13+ oder Ca15+, mit bisher unerreichter Präzision spektroskopiert. Bis vor wenigen Jahren war dies unmöglich, da HCI bei hohen Temperaturen erzeugt werden. Innerhalb unserer Kollaboration mit dem Max-Planck-Institut für Kernphysik in Heidelberg konnten dies erstmal gelöst werden. Dazu werden HCI aus einem Plasma in eine Paul-Falle transportiert, wo sie sympathetisch mit Be+ gekühlt werden. Dies erlaubt uns die Anwendung von Techniken der Quantenoptik zur Manipulation des internen Zustands des HCI.

Innerhalb dieses Projektes soll ein neuer Helixresonator gebaut werden welcher die Radiofrequenzspannung für unsere Ionenfalle zur Verfügung stellt. Da unser Experiment kryogen (~4 K) betrieben wird, bietet sich hierfür die Verwendung von supraleitenden Materialien an um Restwiderstände zur verringern.

Aufgabengebiete:

  • Design und Entwicklung eines supraleitenden Helixresonators.

  • Test des Resonators in einem kroygenen Aufbau, und Messung der Güte.

  • Integration des Resonators in Ionenfalle und Experimente an gefangenen Ionen.

Ihr Profil:

  • Gute abgeschlossenes Bachelorstudium der Physik oder vergleichbar

  • Gute Kenntnisse in Elektronik und CAD sind hilfreich

  • Hohes Engagement, eigenverantwortliches Arbeiten sowie Lernbereitschaft

  • Team- und Kommunikationsfähigkeit

  • Deutsch- und Englischkenntnisse (in Wort und Schrift)

  • Die physische Möglichkeit zur Laborarbeit und Durchführung von Experimenten muss gegeben sein.

Project Website

Flyer

Bei Interesse bitte Prof. Dr. P. O. Schmidt kontaktieren.