Quantum Information Processing
Our setups allow for full control over an atom residing inside a cavity as well as over all optical fields to which the atom is exposed. With these tools for quantum engineering at hand, we routine produce streams of single photons, whose shape, frequency, direction, polarization, and phase can independently be controlled. The cavity not only serves as an integral part of the photon creation process but also allows for the efficient and in principle deterministic emission into a well defined spatial mode. The coupling mechanism based on cavity QED allows for the creation of atom-photon and photon-photon entanglement with high fidelity, proven via full quantum-state tomography and also the violation of a Bell inequality.
Atom-cavity systems are naturally at the heart of intriguing concepts for quantum computing and quantum communication. Along these lines, we realized an elementary quantum network comprised of two nodes. Here, we investigate the building blocks of distributed quantum networks, such as quantum state transfer and remote entanglement generation.
Open PositionIf you are interested in joining our team as a PhD student, have a look at the job description.
Nondestructive Detection of an Optical Photon" by Andreas Reiserer et al. has been published in Science Express. We provide here free access to abstract and reprint of the manuscript. More information for the general audience can be found in our press release.
November 2013: We welcome Mahmood Sabooni in our goup! Mahmood did his PhD on quantum memories at Lund University in Sweden and is now working as a post-doc on the Qgate-Experiment.
October 2013: We welcome the new members of the QIP-team! Bastian Hacker and Josef Schupp are both joining the Qgate-Experiment for a PhD and a Master thesis, respectively. Matthias Körber is reinforcing the Photon Pistol Experiment as a PhD candidate.
September 2013: At the Conference on Resonator QED in Munich, Andreas Neuzner received the prize for the best poster presentation. The poster prize was sponsored by "Applied Physics B" and included a trophy money of 300 EUR. Gladly, Andi invested parts of it in a barrel of beer that he shared with the whole Quantum Dynamics Group!
"Efficient Teleportation Between Remote Single-Atom Quantum Memories" by Christian Nölleke et al. has been published in Physical Review Letters.
An elementary quantum network of single atoms in optical cavities" by Stephan Ritter et al. has been published in Nature. More information for the general audience can be found in our press release and on the websites of Science, Scientific American and IEEE Spectrum. Spektrum der Wissenschaft and Deutschlandfunk report in German.
March 2012: Manuel Uphoff wins best poster award at the YAO 2012 conference in Krakow, Poland.
"A single-atom quantum memory" by Holger Specht et al. has been published in Nature. The QGate team has realized the most fundamental implementation of an optical quantum memory: Arbitrary polarization states of light can be mapped into and out of a single atom trapped inside an optical cavity, achieving an average fidelity of 93% and storage times of more than 180µs. More information for the general audience can be found in our press release.