TY - BOOK

T1 - High frequency techniques for detection of Majorana zero modes in hybrid InAs/Al nanowires

AU - Sabonis, Deividas

PY - 2019

Y1 - 2019

N2 - Topological quantum computing has traveled a long road, from theoretical proposals to recently becoming an experimental reality. Starting from the first set of experiments performed in Delft in 2012 by Mourik et al., several other groups reported data consistent with Majorana bound states in a one-dimensional superconductor-semiconductor system. This was quickly followed by the advances in the nanofabrication methods, that led to the improved quality of devices with better resolved transport signatures going as far as the observation of exponential energy splitting by Albrecht et al. as a strong support for Majorana bound states.In topological quantum computing a well defined quantum state could be destroyed b yphysical processes that change the parity of the superconductor. For example, a quasiparticle entering the islands from one of the outer parts of the system can take the qubit out of the computational subspace. Protection against such errors requires qubit manipulation and readout on a time scale shorter than the typical parity switching and internal dynamics of the system. This contribution in a form of PhD thesis further investigates hybrid one dimensional structures as a potential future platform for topological quantum information processing. However, differently than in the previous theses and publications, here low frequency transport makes only a small part of characterization methods. Instead, the work concerns with the development and implementation of high frequency measurement techniques for detection, readout and eventually in the future, manipulation of Majorana zero modes in hybrid InAs/Al nanowires. In particular, fast radio frequency nanowire-based charge sensors working in magnetic fields up to 1 T both for state readout and gate-space mapping are realized. Later on, dispersive sensing results in InAs/Al nanowires are presented laying the foundation for the compact

AB - Topological quantum computing has traveled a long road, from theoretical proposals to recently becoming an experimental reality. Starting from the first set of experiments performed in Delft in 2012 by Mourik et al., several other groups reported data consistent with Majorana bound states in a one-dimensional superconductor-semiconductor system. This was quickly followed by the advances in the nanofabrication methods, that led to the improved quality of devices with better resolved transport signatures going as far as the observation of exponential energy splitting by Albrecht et al. as a strong support for Majorana bound states.In topological quantum computing a well defined quantum state could be destroyed b yphysical processes that change the parity of the superconductor. For example, a quasiparticle entering the islands from one of the outer parts of the system can take the qubit out of the computational subspace. Protection against such errors requires qubit manipulation and readout on a time scale shorter than the typical parity switching and internal dynamics of the system. This contribution in a form of PhD thesis further investigates hybrid one dimensional structures as a potential future platform for topological quantum information processing. However, differently than in the previous theses and publications, here low frequency transport makes only a small part of characterization methods. Instead, the work concerns with the development and implementation of high frequency measurement techniques for detection, readout and eventually in the future, manipulation of Majorana zero modes in hybrid InAs/Al nanowires. In particular, fast radio frequency nanowire-based charge sensors working in magnetic fields up to 1 T both for state readout and gate-space mapping are realized. Later on, dispersive sensing results in InAs/Al nanowires are presented laying the foundation for the compact

M3 - Ph.D. thesis

BT - High frequency techniques for detection of Majorana zero modes in hybrid InAs/Al nanowires

PB - Niels Bohr Institute, Faculty of Science, University of Copenhagen

ER -