Article (Scientific journals)
Microwave-controlled coupling of Majorana bound states
Schmidt, Thomas; Nunnenkamp, Andreas; Bruder, Christoph
2013In New Journal of Physics, 15, p. 025043
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Abstract :
[en] We propose microwave-controlled rotations for qubits realized as Majorana bound states. To this end, we study an inhomogeneous Kitaev chain in a microwave cavity. The chain consists of two topologically nontrivial regions separated by a topologically trivial, gapped region. The Majorana bound states at the interfaces between the left (right) regions and the central region are coupled, and their energies are split by virtual cotunneling processes. The amplitude for these cotunneling processes decreases exponentially with the number of sites of the gapped region, and the decay length diverges as the gap of the topologically trivial region closes. We demonstrate that microwave radiation can exponentially enhance the coupling between the Majorana bound states, both for classical and quantized electric fields. By solving the appropriate Liouville equation numerically, we show that microwaves can drive Rabi oscillations in the Majorana sector. Our model emerges as an effective description of a topological semiconductor nanowire in a microwave cavity. Thus, our proposal provides an experimentally feasible way to obtain full single-qubit control necessary for universal quantum computation with Majorana qubits.
Disciplines :
Physics
Author, co-author :
Schmidt, Thomas ;  University of Basel > Department of Physics
Nunnenkamp, Andreas
Bruder, Christoph
External co-authors :
yes
Language :
English
Title :
Microwave-controlled coupling of Majorana bound states
Publication date :
2013
Journal title :
New Journal of Physics
ISSN :
1367-2630
Publisher :
Institute of Physics Publishing, United Kingdom
Volume :
15
Pages :
025043
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 18 February 2015

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