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Prof. Dr. Rudolf Gross

Photo von Prof. Dr. rer. nat. habil. Rudolf Gross.
Phone
+49 89 289-14249
Room
E-Mail
rudolf.gross@tum.de
Links
Homepage
Page in TUMonline
Group
Technical Physics
Job Title
Professorship on Technical Physics
Consultation Hour
on appointment

Courses and Dates

Title and Module Assignment
ArtSWSLecturer(s)Dates
Condensed Matter Physics 1
course documents
Assigned to modules:
VO 4 Filipp, S. Gross, R. Thu, 10:00–12:00, virtuell
Tue, 12:00–14:00, virtuell
Superconductivity and Low Temperature Physics 1
eLearning course course documents
Assigned to modules:
VO 2 Deppe, F.
Responsible/Coordination: Gross, R.
Thu, 12:00–14:00, virtuell
Advances in Solid State Physics
course documents
Assigned to modules:
PS 2 Gross, R. Tue, 10:15–11:30, virtuell
and singular or moved dates
Superconducting Quantum Circuits
course documents
Assigned to modules:
PS 2 Deppe, F. Filipp, S.
Responsible/Coordination: Gross, R.
Assisstants: Fedorov, K.Marx, A.
Tue, 14:30–16:00, WMI 142
Exercise to Condensed Matter Physics 1
course documents
Assigned to modules:
UE 2 Geprägs, S.
Responsible/Coordination: Gross, R.
dates in groups
Exercise to Superconductivity and Low Temperature Physics 1
eLearning course course documents
Assigned to modules:
UE 2 Deppe, F.
Responsible/Coordination: Gross, R.
dates in groups
Colloquium on Solid State Physics
current information
Assigned to modules:
KO 2 Gross, R. Thu, 17:00–19:00, PH HS3
FOPRA Experiment 16: Josephson Effects in Superconductors
current information
Assigned to modules:
PR 1 Gross, R.
Assisstants: Chen, Q.Nojiri, Y.
Revision Course to Advances in Solid State Physics
Assigned to modules:
RE 2
Responsible/Coordination: Gross, R.
Revision Course to Superconducting Quantum Circuits
Assigned to modules:
RE 2
Responsible/Coordination: Gross, R.
Walther-Meißner-Seminar on Topical Problems of Low Temperature Physics
current information
Assigned to modules:
SE 2 Filipp, S. Gross, R. Fri, 11:00–12:30, WMI 143

Offered Bachelor’s or Master’s Theses Topics

Breitbandiges dispersives Auslesen von supraleitenden Qubits

An essential step for implementation of quantum computing architectures is an efficient readout of qubits. In the field of superconducting quantum circuits, this is typically realized by dispersively coupling a superconducting qubit to a microwave resonator. Then, the frequency of the resonator depends on the state of the qubit. The former can be extracted by probing the resonator with a coherent  tone. However, efficiency of this readout approach is fundamentally limited by quantum  laws. The corresponding threshold is commonly known as the standard quantum limit and bounds quantum efficiency of the readout process by 50%. Nevertheless, recent investigations have shown that it is possible to circumvent this limit and reach quantum efficiency of the qubit readout of 100% by exploiting broadband readout signal combined with Josephson parametric amplifiers.

 

The goal of this Master project is to build a proof-of-principle experimental setup and perform microwave cryogenic measurements on a superconducting transmon qubit in the broadband regime in order to demonstrate violation of the standard quantum limit in the dispersive readout.

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
Elektronenspindynamik in einer stark koppelnden Umgebung

Modern quantum circuits allow to study strong light-matter interaction in a variety of systems. This so-called strong-coupling regime is key for many aspects of quantum information processing. This project focusses on strong coupling between a paramagnetic electron spin ensemble and a superconducting microwave resonator. Strong coupling is an established phenomenon in this system. However, many aspects regarding the dynamics of this coupled system as well as the non-linear response properties are not fully understood, yet, and we will address these aspects within this project. For this project, we will use superconducting microwave resonators based on NbTiN and spin paramagnetic spin ensembles of phosphorous donors and erbium centers in silicon.

 

We are looking for a highly motivated master student joining this project. Within your thesis, you will address questions regarding the dynamic response of a strongly coupled system based on a paramagnetic spin ensemble and a microwave resonator. In this context, you will fabricate and optimize microwave resonators and operate them at cryogenic temperatures. In addition, you will use complex microwave pulses, to control the coupled system and experimentally investigate its dynamical response. Within the project, you will learn how to fabricate superconducting microwave resonators in our in-house cleanroom and how to synthesize microwave pulses using arbitrary waveform generators

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Hans Hübl
FPGA-basiertes Rückkopplungsverfahren für die Mikrowellen-basierte Quantenkommunikation

Quantum experiments often require fast and versatile data processing which allows for a quantum feedback operation. This approach opens the road to many fascinating experiments such as quantum teleportation, entanglement purification,  quantum error correction, among others. Here, we would like to develop a specific measurement and feedback setup, based on a field programmable gate array (FPGA), for experiments with propagating quantum microwaves.

The main goal is to program and experimentally test a specific image for an FPGA  which would allow for acquisition of microwave signals and feedback generation over few hundred of nanoseconds. This timescale is the prerequisite for exploiting quantum correlations effects for quantum communication and cryptography protocols with propagating squeezed microwaves which are conducted in our lab. This project will offer a deep insight into the state‑of‑the‑art FPGA devices, microwave measurements, and cryogenic experiments with superconductors.

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
High-field magnetotransport in an organic superconductor in proximity to the spin-liquid state

A member of the k-(ET)2X family to be studied in this Master thesis exhibits a novel state of matter, quantum spin liquid at ambient pressure. Under a moderate pressure of about 3 kbar the material becomes metallic and superconducting. The aim of the work is to trace the evolution of the conducting system, particularly, of correlation effects, in close proximity to the superconductor-insulator phase boundary. The intrinsic properties of charge carriers will be probed by high-field magnetoresistance effects with the focus on magnetic quantum oscillations. A part of the experiments will be done at the European Magnetic Field Laboratory in steady fields up to 30 T or in pulsed fields up to 80 T.

Physics: Correlated electron systems; magnetic quantum oscillations; unconventional superconductivity.

Techniques: Strong magnetic fields; high pressures; cryogenic (liquid 4He; 3He; dilution fridge) techniques; high-precision magnetoresistance measurements.

Contact person:  Mark Kartsovnik (mark.kartsovnik@wmi.badw.de

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Rudolf Gross
Interaction between magnetic and conducting layers in molecular antiferromagnetic superconductors

Hybrid materials combining nontrivial conducting and magnetic properties are of high current interest, especially in the context of potential spintronic applications. The organic charge transfer salts (BETS)2FeX4 with X = Cl, Br provide perfect natural structures of conducting and magnetic layers alternating on the single-molecule level. Our project is aimed at a quantitative study of the interaction between the two subsystems and of the role of the subtle structural modifications in this family. To this end, high-precision measurements of quantum oscillations in the electrical resistance and magnetization will be carried out on single crystals of these compounds under strong magnetic fields. The results will be analyzed in terms of electronic correlation and magnetic interaction effects.

Physics: Correlated electronic systems; magnetic ordering and superconductivity; magnetic quantum oscillations.

Techniques: Strong magnetic fields; magnetotransport; magnetic torque; cryogenic (liquid 4He and 3He) techniques.

Contact person:  Mark Kartsovnik (mark.kartsovnik@wmi.badw.de)

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Rudolf Gross
Kalibrierung von Frequenz und Nichtlinearität in einem Bose-Hubbard-System

Bose-Hubbard systems offer an intriguing opportunity of studying quantum driven-dissipative dynamics. Nowadays, these systems can be conveniently implemented by combining superconducting resonators with Josephson junctions. In order to successfully measure nonclassical effects in these systems, such as generation of antibunched light, one needs to accurately quantify their respective frequency range and nonlinearity strength. This goal can be achieved by cryogenic microwave measurements of a Bose-Hubbard dimer with superconducting quantum circuits and numerical modelling of the respective Hamiltonian. These two steps comprise the main body of the current master project. The successful project will potentially lead to a development of robust single-photon microwave sources and further exploration of quantum matter in the form of networks of nonlinear superconducting resonators.

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
Study of the electromagnetically induced transparency in the rare-earth spin ensembles in the microwave regime
A reliable quantum memory system is being actively searched for among different types of solid-state systems. In particular, rare-earth doped spin ensembles, which possess favorable transitions in optical and microwave ranges, are promising candidates. The current project aims at developing a quantum memory system based on rare-earth spin ensembles. Such quantum memory elements should work at zero magnetic field at ultra-low temperatures. The major task of this project is to implement the electromagnetically induced transparency, widely used in optics, into the microwave regime. We are looking for a highly motivated master student joining this project. Within your thesis, you will couple the spin-ensembles to the superconducting transmission lines and will manipulate the spin-states with microwave pulses. You will learn about the nature of the electromagnetically induced transparency and its application in quantum memory. Within the project, you will get hands on experience in synthesizing microwave pulses; how to measure the time responses of the spin-systems and how to operate such systems at cryogenic temperatures.
suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
Time-domain study of the dynamics of microwave spectral holes in the rare-earth spin ensembles
A reliable quantum memory system is being actively searched for among different types of solid-state systems. In particular, rare-earth doped spin ensembles, which possess favorable transitions in optical and microwave ranges, are promising candidates. The current project aims at developing a quantum memory system based on rare-earth spin ensembles. Such quantum memory elements should work at zero magnetic field at ultra-low temperatures. The major task of this project is to implement the spectral hole burning technique, widely used in optics, into the microwave regime. We are looking for a highly motivated master student joining this project. Within your thesis, you will address questions regarding the dynamics of spectral holes in the absorption profiles of the rare-earth spin ensembles in the microwave regime. You will couple the spin-ensembles to the superconducting transmission lines and will manipulate the spin-states with microwave pulses. Within the project, you will learn about dynamics of the spin-states, how to synthesize microwave pulses, measure the time responses of the spin-systems and how to operate such systems at cryogenic temperatures.
suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Rudolf Gross
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