% IMPORTANT: The following is UTF-8 encoded. This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.
@PHDTHESIS{Ohm:680898,
author = {Ohm, Christoph},
othercontributors = {Hassler, Fabian and Schmidt, Thomas and DiVincenzo, David
P.},
title = {{Q}uantum measurements in {M}ajorana circuit quantum
electrodynamics},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
reportid = {RWTH-2016-12079},
pages = {1 Online-Ressource (xiv, 160 Seiten) : Illustrationen,
Diagramme},
year = {2016},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2017; Dissertation, RWTH Aachen University, 2016},
abstract = {Quantum computation is a multifaceted field of research
aiming for the physical realization of quantum systems and
their manipulation. This thesis discusses the combination of
two notable approaches in the pursuit of a fully operational
quantum computer---circuit quantum electrodynamics and
topological quantum computation based on Majorana
quasiparticles. In circuit quantum electrodynamics quantum
information is stored into small superconducting circuit
elements whose interaction with electromagnetic radiation in
the range of microwaves allows to process quantum
information very efficiently. This approach has proven
extremely useful for control and readout of superconducting
qubits, i.e., small circuit elements that carry quantum
information. Because of remarkably strong light-matter
couplings that can be achieved for superconducting qubits in
microwave resonators, the circuit quantum electrodynamics
architecture is particularly useful to perform highly
sensitive quantum measurements.Superconductivity by itself
is an intriguing state of matter that shows a great variety
of different phenomena. In particular, the discovery of
topological phases in superconductors opened new horizons
for quantum computation. One notable system that admits
topological superconductivity is a
semiconductor-superconductor nanowire with special zero
modes occurring at its ends. These so-called Majorana zero
modes are remarkably robust against decoherence and
therefore well-suited for fault-tolerant quantum
computation.The first part of this thesis examines the
coupling of Majorana zero modes to electromagnetic radiation
with microwave frequencies. The light-matter coupling
mechanism that is considered here arises for Majorana zero
modes located at a voltage-biased superconducting tunneling
junction. The emission of microwave radiation in presence of
Majorana zero modes gives rise to coherent radiation which
is emitted at half of the usual Josephson frequency. On the
basis of this fractional Josephson radiation, we propose a
microwave readout scheme for Majorana qubits. As usual for
typical measurements in circuit quantum electrodynamics, the
proposed readout implements a quantum non-demolition
measurement for Majorana qubit.In the last part of the
thesis we propose a novel scheme for the implementation of
measurement-induced entanglement between remote
superconducting qubits as required for quantum
communication. By detecting a single photon, that passes a
Mach-Zehnder interferometric setup, deterministic
entanglement with single-shot efficiency is achieved. This
scheme essentially relies on the strong coupling between the
qubits and the photon.},
cin = {137230 / 130000},
ddc = {530},
cid = {$I:(DE-82)137230_20140620$ / $I:(DE-82)130000_20140620$},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:hbz:82-rwth-2016-120797},
doi = {10.18154/RWTH-2016-12079},
url = {https://publications.rwth-aachen.de/record/680898},
}
guest ::