C. Bäuerle |
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Directeur de Recherche (PhD)
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Publications (49) View all
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Article: Observation of conduction electron spin resonance in boron doped diamond
Péter Szirmai, Gábor Fábián, János Koltai, Bálint Náfrádi, László Forró, Thomas Pichler, Oliver A. Williams, Soumen Mandal, Christopher Bäuerle, Ferenc Simon[show abstract] [hide abstract]
ABSTRACT: We observe the electron spin resonance of conduction electrons in boron doped (6400 ppm) superconducting diamond (Tc =3.8 K). We clearly identify the benchmarks of conduction electron spin resonance (CESR): the nearly temperature independent ESR signal intensity and its magnitude which is in good agreement with that expected from the density of states through the Pauli spin-susceptibility. The temperature dependent CESR linewidth weakly increases with increasing temperature which can be understood in the framework of the Elliott-Yafet theory of spin-relaxation. An anomalous and yet unexplained relation is observed between the g-factor, CESR linewidth, and the resistivity using the empirical Elliott-Yafet relation.05/2013; -
SourceAvailable from: C. Bäuerle
Dataset: Supplementary Material "Electrical control of a solid state flying qubite"
Michihisa Yamamoto, Shintaro Takada, Christopher Bäuerle, Kenta Watanabe, Andreas D Wieck, Seigo Tarucha -
Article: A detailed analysis of the Raman spectra in superconducting boron doped nanocrystalline diamond
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ABSTRACT: The light scattering properties of superconducting (Tc ≈ 3.8 K) heavily boron doped nanocrystalline diamond has been investigated by Raman spectroscopy using visible excitations. Fano type interference of the zone-center phonon line and the electronic continuum was identified. Lineshape analysis reveals Fano lineshapes with a significant asymmetry (q ≈ −2). An anomalous wavelength dependence and small value of the Raman scattering amplitude is observed in agreement with previous studies.physica status solidi (b) 11/2012; 249(12):2656. · 1.32 Impact Factor -
Article: A few-electron quadruple quantum dot in a closed loop
Romain Thalineau, Sylain Hermelin, Andreas D. Wieck, Christopher Bäuerle, Laurent Saminadayar, Tristan Meunier[show abstract] [hide abstract]
ABSTRACT: We report the realization of a quadruple quantum dot device in a square-like configuration where a single electron can be transferred on a closed path free of other electrons. By studying the stability diagrams of this system, we demonstrate that we are able to reach the few-electron regime and to control the electronic population of each quantum dot with gate voltages. This allows us to control the transfer of a single electron on a closed path inside the quadruple dot system. This work opens the route towards electron spin manipulation using spin-orbit interaction by moving an electron on complex paths free of electrons09/2012; -
SourceAvailable from: C. Bäuerle
Article: Electrical control of a solid-state flying qubit.
Michihisa Yamamoto, Shintaro Takada, Christopher Bäuerle, Kenta Watanabe, Andreas D Wieck, Seigo Tarucha[show abstract] [hide abstract]
ABSTRACT: Solid-state approaches to quantum information technology are attractive because they are scalable. The coherent transport of quantum information over large distances is a requirement for any practical quantum computer and has been demonstrated by coupling super-conducting qubits to photons. Single electrons have also been transferred between distant quantum dots in times shorter than their spin coherence time. However, until now, there have been no demonstrations of scalable 'flying qubit' architectures-systems in which it is possible to perform quantum operations on qubits while they are being coherently transferred-in solid-state systems. These architectures allow for control over qubit separation and for non-local entanglement, which makes them more amenable to integration and scaling than static qubit approaches. Here, we report the transport and manipulation of qubits over distances of 6 µm within 40 ps, in an Aharonov-Bohm ring connected to two-channel wires that have a tunable tunnel coupling between channels. The flying qubit state is defined by the presence of a travelling electron in either channel of the wire, and can be controlled without a magnetic field. Our device has shorter quantum gates (<1 µm), longer coherence lengths (∼86 µm at 70 mK) and higher operating frequencies (∼100 GHz) than other solid-state implementations of flying qubits.Nature Nanotechnology 03/2012; 7(4):247-51. · 27.27 Impact Factor