Dr. Kirill Fedorov

Lehrveranstaltungen und Termine

Ausgeschriebene Angebote für Abschlussarbeiten

Entwicklung einer schnellen Rückkopplung für Quanteninformationsverarbeitungsprotokolle

Quantum information processing is based on rapid operations with fragile, and often short-lived, quantum states. In particular, superconducting nonlinear systems, such as quantum bits or Josephson parametric amplifiers, are offering outstanding capabilities in this field. In order to implement useful quantum protocols with these circuits, one often needs to perform local nonlinear operations on quantum states. One way to achieve the latter is to employ fast feedback schemes, when the state of interest is being quickly measured, and then, affected by an externally  generated signal, dependent on the measurement outcome. This allows one to implement many novel and important protocols such as quantum teleportation or quantum state stabilization. The particular implementation of is going to be based on FPGA-based real-time tomography measurements and a subsequent digital signal generation. To this end, one needs to program the FPGA and perform cryogenic  microwave measurements and data analysis in the framework of quantum physics.
Kategorie: Quantum information processing; Quantum microwaves; Feedback; FPGA programming.

Betreuer: Kirill.Fedorov@wmi.badw.de, Frank.Deppe@wmi.badw.de, Achim.Marx@wmi.badw.de , Rudolf.Gross@wmi.badw.de

geeignet als

• Masterarbeit Physik der kondensierten Materie
• Masterarbeit Applied and Engineering Physics

Themensteller(in): Rudolf Gross

Entwicklung von experimentellen Millikelvin-Techniken für die supraleitende Quantentechnologie

Quantum science with superconducting circuits has recently been recognized as the most promising quantum technology hardware platform by industry (IBM, Google, various startups) and large efforts have been started to develop the underlying technologies. For this reason, 'quantum engineering' has become an important qualification for physicists. In this master thesis, you take one of the central experimental tool into operation: a cryostat operating only few hundreds of millikelvin above absolute zero. You then use this cryostat  to characterize low-loss superconducting quantum circuits.
Categoy: Cryogenics, Quantum information processing, Qunatum technology

Betreuer: Kirill.Fedorov@wmi.badw.de, Frank.Deppe@wmi.badw.de, Achim.Marx@wmi.badw.de , Rudolf.Gross@wmi.badw.de

geeignet als

• Masterarbeit Physik der kondensierten Materie
• Masterarbeit Applied and Engineering Physics

Themensteller(in): Rudolf Gross

Herstellung und Charakterisierung von breitbandigen parametrischen Verstärkern auf der Basis von Josephson-Kontakten

Josephson parametric amplifiers (JPAs) are microwave devices based on nonlinear superconducting resonators. JPAs are important building blocks in experiments with quantum circuits as they allow for  quantum-limited amplification of incoming signals, which is crucial for fast and reliable operation of future quantum computers. A critical limitation of conventional JPAs is their relatively narrow  bandwidths. One possible way to increase the bandwidth, is to carefully engineer the resonator quality factor and the strength of its nonlinearity. Another, a more novel and difficult approach, is to use a microwave transmission line, instead of the resonator, strongly coupled to an ensemble of nonlinear elements provided by Josephson junctions. Such devices are also known under the name of traveling-wave Josephson parametric amplifiers (TWPA) and present a more flexible way of building of quantum-limited broadband microwave amplifiers. The main goal of this thesis is to design, fabricate, and characterize prototypes of broadband JPAs, and possibly TWPA. The fabrication is going to be based on the thin-film aluminum shadow evaporation process.                                                                                                                                                                                                             
Kategorie: Thin-film fabrication; Microwave measurements; Cryogenics.

Betreuer: Kirill.Fedorov@wmi.badw.de, Frank.Deppe@wmi.badw.de, Achim.Marx@wmi.badw.de , Rudolf.Gross@wmi.badw.de

geeignet als

• Masterarbeit Physik der kondensierten Materie
• Masterarbeit Applied and Engineering Physics

Themensteller(in): Rudolf Gross

Korrelationsmessungen in einem Bose-Hubbard Dimer

Nonlinear superconducting quantum circuits allow one to model artificial matter in a bottom-up approach the laboratory. At the WMI, we have recently implemented a Bose-Hubbard dimer with tunable on-site nonlinearity. Your task will be to participate in correlation measurements of such structures. By means of this technique, which is a specialty of our group, you will investigate phase transitions of this system in the driven-dissipative regime.
Kategorie: Superconducting quantum circuits; Quantum simulation; Bose-Hubbard model

Betreuer: Kirill.Fedorov@wmi.badw.de, Frank.Deppe@wmi.badw.de, Achim.Marx@wmi.badw.de , Rudolf.Gross@wmi.badw.de

geeignet als

• Masterarbeit Physik der kondensierten Materie
• Masterarbeit Applied and Engineering Physics

Themensteller(in): Rudolf Gross