Project information
- Title: Gate sensing poor man’s Majoranas in a two-site Kitaev chain
- Category: Condensed Matter Physics, Quantum Physics
- Location: QuTech, Delft, the Netherlands
- Project date: Sep. 2023 – May 2024
- Promoter: Dr. Srijit Goswami
- Supervisors: Bas ten Haaf, Ivan Kulesh
- Other committee members: Prof. Dr. Anton Akhmerov, Dr. Anasua Chatterjee
- Grade: 8.5/10
- This thesis can be shared upon request.
Abstract
Majorana bound states have been of significant interest in the field of condensed matter physics. They can be hosted in a chain of at least two coupled, hybridised quantum dots, as recently realised in the nanowire and the 2DEG platform. These observations have led towards a series of proposed experiments towards Majorana-based qubits. However, scaling existing Majorana systems can be challenging for future applications in quantum computing. Tuning and measuring longer Kitaev chains is a complex process. To facilitate these future experiments, a secondary tuning technique can be useful to extract information from the system. Gate sensing is a suitable candidate. It employs the gates already present in the system as an alternative radio-frequency reflectometry technique, and doesn’t necessitate the same on-chip complexity as in the case of traditional lead-based reflectometry. This thesis presents an investigation towards using gate sensing methods for Kitaev chains in 2DEG semiconductor-superconductor hybrids. We present a way to use gate sensing to tune single-lead systems and analyse the less trivial behaviour of gate sensing in floated chains.