Bachelors / Masters Projects

Plastic Fantastic Qubit

A new Masters Project to experimentally develop superconducting transmon qubits fabricated on a flexible substrate, kapton. Numerous technical problems in realizing qubits will be addressed if kapton-based qubits can be realized, but it has never been done. Why? No one has tried! We have all the ingredients; someone just needs to dig in and do it. Is that you? Read more here>> 

If this sounds interesting, contact Charles Marcus (marcus@nbi.dk) or Morten Kjaergaard (mkjaergaard@nbi.ku.dk).

Quantum Hall Interferometry

A new Masters Project to experimentally investigate thermal transport in quantum Hall systems. The project aims to understand some subtle aspects of exotic carriers in the fractional quantum Hall regime, where excitations are neither fermions or bosons, but anyons with fractional or even nonabelian (braiding) statistics. Read more here>>

If this sounds interesting contact Charles Marcus (marcus@nbi.dk) or Anasua Chatterjee (anasua.chatterjee@nbi.ku.dk).

Thermal transport in quantum Hall systems

A new Masters Project is available to experimentally investigate thermal transport in quantum Hall systems. The project aims to understand some subtle aspects of exotic carriers in the fractional quantum Hall regime, where excitations are neither fermions nor bosons, but anyons with fractional or even nonabelian (braiding) statistics. These properties are sometimes invisible in electrical transport but can be seen in the transport of heat through the device. Read more here>>

If this project interests you, please contact Charles Marcus (marcus@nbi.dk) or Anasua Chatterjee (anasua.chatterjee@nbi.ku.dk).

Superconductors and ferromagnets: fight or compromise?

A new Masters Project is available in the Center for Quantum Devices to experimentally investigate the interaction of superconductors with ferromagnetic insulators as a route to producing spin-triplet superconductors. When simple metals become superconductors at low temperatures, electrons in the metal pair up with opposite spins, resulting in a total electron spin zero in the material. A ferromagnetic insulator grown on the surface of the metal favors spin alignment. Who wins, the superconductor or the ferromagnet? Under the right circumstances, it is predicted that the two opposing trends can find a compromise and form a new kind of superconducting state of electron pairs with aligned spins. Is it true? Read more here>>

If you are interested contact Saulius Vaitiekénas (saulius@nbi.ku.dk) or Charles Marcus (marcus@nbi.dk).

Two-dimensional Josephson Arrays

A new Masters Project to experimentally investigate quantum phases in two-dimensional arrays of Josephson junctions is available in the Center for Quantum Devices (QDev). Josephson arrays can be fabricated from superconductor-semiconductor heterostructures, allowing voltage control of phase transitions. What new phases of matter will emerge when a flux is thread and the gate voltage is changed? Can we generate unique ground states in different lattice geometries? Read more here>>

To learn more, contact Charles Marcus at marcus@nbi.dk or Saulius Vaitiekénas (saulius@nbi.ku.dk).

Single-mode SQUIDs for parity protected qubits

A new Masters Project to experimentally investigate how superconducting quantum interference devices (SQUIDs) functions with quantized conductances in their arms work. The goal to continue our investigation of protected qubits based on superconductor-semiconductor SQUIDs. The project involves design, fabrication, and measurement of these structures at millikelvin temperatures in collaboration with PhD students, postdocs, and faculty. Read more here >>

If you are interested, contact Morten Kjaergaard (mkjaergaard@nbi.ku.dk) or Charles Marcus (marcus@nbi.dk).

Experiments on quantum wires and hybrid quantum dots 

Student projects will focus on devices based on nanostructured materials synthesized in-house such as semiconductor nanowires or carbon-based materials. When superconducting electrodes are attached to such wires, they form quantum dots where we can study the states arising in such ”artificial superconducting atoms/molecules”. Currently we are investigating these quantum states and the coupling between them in different multi-quantum-dot geometries consisting of, e.g., serial or parallel double quantum dots contacted with one or more superconducting electrodes. Read more here >>

If you are interested in being involved please contact Kasper Grove-Rasmussen (k_grove@fys.ku.dk) or Jesper Nygård (nygard@nbi.dk).

Electron Spin Based Qubits 

Our spin qubit team is looking for bachelor and master students to work on several new projects to fabricate, control, read out, and couple single electron spins to make quantum mechanical bits, the building block for a quantum computer. Using state-of-the-art electron beam lithography at the center’s nanofabrication facilities we are able to fabricate semiconducting quantum dots of ~ 100 nm in size. These dots contain a single electron, like an artificial hydrogen atom. We work on the material platforms SiGe, silicon-on-insulator and GaAs. At sufficiently low temperatures (tens of millikelvin) we can couple these quantum dots to each other. By applying high frequency pulses (MHz to GHz regime) we can control and read out their spin state with high fidelity.

Silicon-28 spin qubit project, read more here >>

Foundry-fabricated spin qubit project, read more here >>

Multi-qubit operations in GaAs, read more here >>

FPGA-based qubit classification, read more here >>

If you are interested in these or other projects of the spin qubit team, please contact Ferdinand Kuemmeth (kuemmeth@nbi.dk).