Bi-Directional Tuning of Josephson Junction Resistance

One of the main components used in superconducting quantum chips is the Josephson junction. Currently when fabricating Josephson junctions, the resistance uniformity at wafer-scale is not optimal. It is also known that an annealing process can alter the junction resistance and with it the qubit frequency. However, laser annealing has only shown...

Enhanced Filterbanks for THz On-Chip Spectrometers

Terahertz astronomy has been exceptionally unexplored until the last decades due to a technological gap, but exactly at these wavelengths the most distant galaxies appear very bright. Efficient instruments that are capable of spectrometry are essential in understanding the physics of these distant objects. Within the framework of this thesis, an...

Superconducting Magnetic field Generator: Zeeman Splitting Tuning for Defects in Diamond

Color centers in diamond offer exciting opportunities for implementing an effective solid-state spinphoton interface. Access to and control of spin-photon interaction can help realize a scalable, modular quantum computer using the color center spins. A large magnetic field is needed for splitting the color center spin states, enabling definition...

Vertically-Aligned Multi-Walled Carbon Nano Tube Pillars with Various Diameters under Compression: Pristine and NbTiN Coated

In this paper, the compressive stress of pristine and coated vertically-aligned (VA) multi-walled (MW) carbon nanotube (CNT) pillars were investigated using flat-punch nano-indentation. VA-MWCNT pillars of various diameters (30–150 µm) grown by low-pressure chemical vapor deposition on silicon wafer. A conformal brittle coating of niobium...

Dielectric Loss Measurements at Sub-K Temperatures and Terahertz Frequencies

On-chip spectrometers, such as DESHIMA and SuperSpec, require transmission lines with very low loss of tanδ < 10^-4 to achieve sufficient system efficiency. Transmission lines with higher loss would introduce too much signal attenuation in the line from antenna to filter and in the filters themselves. Data regarding the losses of...