Diamond Materials

Diamond Materials for Quantum Application

23. September 2014: The DFG research group FOR 1493 “Diamond Materials and Quantum Applications” goes into its second funding period. FOR1493 is a national research consortium funded by the Deutsche Forsch-ungsgemeinschaft.

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ERC Advanced Grant


Doktorandenstellen / PhD-Positons

Single molecule quantum optics

Single molecules are among the brightest single photon sources and can be well used in quantum optics. Furthermore, under cryogenic conditions their lines might be as narrow as 15MHz. Their spectral lines cover the entire visible spectrum and can be tailored to match also to atomic lines. Therefore, we combined single molecules and atomic spectroscopy in the last years.

We seek a highly motivated candidate to continue our experimental efforts to build the brightest and narrowest single photon source and to combine these photons with atomic vapors. Experimental challenges such as photonic quantum storage inside atomic vapor, and optical quantum gates are your daily business. Besides a lot of work, we offer a vibrant and international working environment.

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To apply, please send your CV and a motivation letter to Ilja Gerhardt

Postdoctoral Positions

Quantum Optical Microphone

Laser and fibre microphones are used for high sensitivity recording of acoustic signals, especially in harsh environments. Applications comprise sound recording in long-distance espionage and surveillance, intestinal exams in medicine and materials inspection. However, as for all classical sensors, sensitivity and maximum sampling rates are ultimately limited by shot noise.

The 3rd physics institute plans to overcome those issues with a quantum optical microphone based on delocalised entangled photon pairs. A major advantage in our novel scheme is that quantum correlations will be revealed using low-cost photodiodes which is a key for future integration and application.

With the quantum microphone, acoustic signals will be recorded with much better signal-to-noise and higher sampling rates. To demonstrate the quantum advantage in real-life, we will perform a standardised medical word recognition test. The target is to demonstrate that human patients recognise words significantly better if they have been recorded with the quantum microphone.
Depending on the results in this project, we plan also to use this technique for highly sensitive distance measurements and optical materials analysis.

Link (intern): PDF

To apply, please send your CV and a motivation letter to Florian Kaiser or Mr. Wrachtrup

Quantum Optical Microscope for Cell Analysis

The 3rd physics institute in Stuttgart is a leader in the development of high-resolution quantum sensors for the life sciences.

A landmark achievement was the single-molecule detection using magnetic resonance imaging. In this project, we seek to extend and combine our competencies with optical imaging. However, standard high-resolution optical microscopy techniques require usually light intensity levels surpassing the Sun's intensity by at least 1000 times. In most cells, this induces severe 'sunburn' and ultimately leads to cell death. To overcome these problems, we will build a quantum optical microscope taking advantage of entangled photon pairs to tremendously increase optical resolution and the absorption of target biomarkers and fluorophores. This allows us to drastically reduce optical intensity levels and perform long-term studies on molecular motors and embryonic cell development.

This project is supervised by Dr. Florian Kaiser who is an expert in the development of high-efficiency entangled photon pair sources, and by Prof. Christof Gebhardt who is a cell biologist at Ulm University.

Link (intern): PDF

To apply, please send your CV and a motivation letter to Florian Kaiser or Mr. Wrachtrup

Entangled Photon Source for Light Matter Interaction

The 3rd physics institute plans the realisation of a quantum repeater node based on spins in the solid state.

In this framework, we will store entangled photons in the repeater node and subsequently release them, while still preserving entanglement. The goal of this MSc or PhD project is to set up an efficient bi-color entangled photon pair source and subsequently use it for high-level quantum information applications. More precisely, a scalable repeater-based quantum internet architecture will be demonstrated, and a human controlled quantum delayed choice experiment will be conducted. In all schemes, one of the photons will be stored and manipulated in the repeater node, while the other photon is either used for heralding or long-distance distribution at a telecom wavelength.

The project will be supervised by Dr. Florian Kaiser who is a well-experienced expert in the development of entangled photon pair sources for light-matter interaction.

Link (intern): PDF

To apply, please send your CV and a motivation letter to Florian Kaiser or Mr. Wrachtrup

PhD thesis: Diamond-based quantum repeater for long-distance quantum communication

The 3rd physics institute in Stuttgart seeks two PhD candidates to join us in our efforts to realise a national quantum communication network based on photons and quantum repeaters in diamond. This project is funded by the Federal Ministry of Education and Research (BMBF) and in line with German quantum technologies roadmap. In strong collaboration with several other German research institutes and companies, the team in Stuttgart will set up a scalable quantum repeater based on colour defects in diamond and associated nuclear spins.

We encourage highly motivated PhD candidates to join us in this adventure.

You should apply if you meet the following requirements:

  • Master degree in physics, electrical engineering or computer science.
  • Demonstrated track record in working in at least one research project.

Additionally, the following assets are considered as a plus:

  • Experience in programming with Python.
  • Knowledge in quantum information and quantum optics.
  • Knowledge in classical communication.

The 3rd physics institute offers you:

  • Working at a world-leading institute in quantum information.
  • Being part of the development of the future quantum internet.
  • Software and hardware development in collaboration with industries.

Starting date: As soon as possible.
Salary: 75 – 100% TVL-E13

To apply, please send your CV and a motivation letter to Florian Kaiser or Mr. Wrachtrup

The single spin group at the Institute is inviting application of candidates for a postdoctoral position. The team pursues research in the area of spin quantum physics and quantum information processing at an internationally highly competitive level. The successful candidate should have a strong background in electron- and nuclear magnetic resonance. The contract is initially limited to 2 years with the possibility of an extension.
Salary and benefits are commensurate with public service organizations (TVöD).

Prof. Dr. Jörg Wrachtrup, Universität Stuttgart, 3. Physikal. Institut, Pfaffenwaldring 57, 70550 Stuttgart.

The Volkmer Lab at the Institute is inviting applications for a Postdoc Position. The successful candidate will take part in a collaborative project that involves fundamental research on improving the detection sensitivity and chemical specificity of Coherent Raman Scattering microspectroscopy, as well as the realization of a variety of applications targeted at the noninvasive chemical mapping of live cells and tissue. The duration of this position is at first one year, with a possible one-year extension. The annual salary is according to E13 (German public service salary scale). More …

Dr. A. Volkmer, 3. Institute of Physics, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.

The Volkmer Lab at the Institute is inviting applications for a Ph.D. Student Position. The group's research activities encompass single-molecule biophysics by means of advanced optical fluorescence microscopy and the non-invasive optical diagnostics of living cells and tissue by coherent Raman scattering (CRS) microspectroscopy. The suitable candidate should have a Diploma or an equivalent degree in Physics, Biophysics or Physical Chemistry with a solid knowledge in one of the following fields: single-molecule Biophysics, ultrafast laser spectroscopy, nonlinear optics, or experimental quantum optics. A vital interest in interdisciplinary research with groups working in the Life Sciences is an asset. The payment for a duration of 36 months will be according to the German public service salary scale of E13/2.
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Dr. A. Volkmer, 3. Institute of Physics, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.