One-step multi-qubit GHZ state generation in a circuit QED system (2009)
Wang, Ying-Dan, Chesi, Stefano, Loss, Daniel, Bruder, Christoph
We propose a one-step scheme to generate GHZ states for superconducting flux qubits or charge qubits in a circuit QED setup. The GHZ state can be produced within the coherence time of the multi-qubit...
Graph criterion for algebraic controllability of quantum networks (2008)
Burgarth, Daniel, Bose, Sougato, Bruder, Christoph, Giovannetti, Vittorio
We give a graph-theoretical criterion sufficient to decide if a quantum system can be controlled by properly manipulating the local Hamiltonian of one of its subsystem (algebraic control). As a...
Aharonov-Bohm-type oscillations of thermopower in a quantum dot ring geometry. (2007)
Blanter, Ya.M., Bruder, Christoph, Fazio, Rosario, Schoeller, Herbert
Photon-assisted transport through ultrasmall quantum dots: influence of intradot transitions. (2007)
Broadening of Andreev bound states in d(xx-yy) superconductors. (2007)
Poenicke, Andreas, Barash, Yu.S., Bruder, Christoph, Istyukov, V.
Nanospintronics with carbon nanotubes (2007)
Cottet, Audrey, Kontos, Takis, Sahoo, Sangeeta, Man, Hon Tin, Choi, Mahn-Soo, Belzig, Wolfgang, ...
One of the actual challenges of spintronics is the realization of a spin-transistor allowing to control spin transport through an electrostatic gate. In this review, we report on different...
Density correlations in ultracold atomic Fermi gases (2007)
Belzig, Wolfgang, Schroll, Christian, Bruder, Christoph
We investigate density fluctuations in a coherent ensemble of interacting fermionic atoms. Adapting the concept of full counting statistics, well known from quantum optics and mesoscopic electron...
Overscreening Diamagnetism in Cylindrical Superconductor-normal Metal-heterostructures (2007)
Belzig, Wolfgang, Bruder, Christoph, Nazarov, Yuli V.
We study the linear diamagnetic response of a superconducting cylinder coated by a normal-metal layer due to the proximity effect using the clean limit quasiclassical Eilenberger equations. We...
Controlling spin in a ballistic electron interferometer with spin active interfaces (2006)
Cottet, Audrey, Kontos, Takis, Belzig, Wolfgang, Schönenberger, Christian, Bruder, Christoph
We consider electronic current transport through a ballistic one-dimensional quantum wire connected to two ferromagnetic leads. We study the effects of the spin-dependence of interfacial phase shifts...
Nanospintronics with carbon nanotubes (2006)
Cottet, A., Kontos, T., Sahoo, S., Man, H.T., Belzig, Wolfgang, ...
One of the actual challenges of spintronics is the realization of a spin transistor allowing control of spin transport through an electrostatic gate. In this paper, we report on different experiments...
Electrical transport through a single-electron transistor strongly coupled to an oscillator (2006)
Doiron, Charles B., Belzig, Wolfgang, Bruder, Christoph
We investigate electrical transport through a single-electron transistor coupled to a nanomechanical oscillator. Using a combination of a master-equation approach and a numerical Monte Carlo method,...
Controlling spin in an electronic interferometer with spin-active interfaces (2006)
Cottet, Audrey, Kontos, Takis, Belzig, Wolfgang, Schönenberger, Christian, Bruder, Christoph
We consider electronic current transport through a ballistic one-dimensional quantum wire connected to two ferromagnetic leads. We study the effects of the spin-dependence of interfacial phase shifts...
Charge and spin density modulations in semiconductor quantum wires (2005)
Lee, Minchul, Bruder, Christoph
We investigate static charge and spin density modulation patterns along a ferromagnet/semiconductor single junction quantum wire in the presence of spin-orbit coupling. Coherent scattering theory is...
Positive cross-correlations due to dynamical channel blockade in a three-terminal quantum dot (2004)
Cottet, Audrey, Belzig, Wolfgang, Bruder, Christoph
We investigate current fluctuations in a three-terminal quantum dot in the sequential tunneling regime. In the voltage-bias configuration chosen here, the circuit is operated as a beam splitter,...
Charge transport through a single-electron transistor with a mechanically oscillating island (2004)
Chtchelkatchev, Nikolai M., Belzig, Wolfgang, Bruder, Christoph
We consider a single-electron transistor (SET) whose central island is a nanomechanical oscillator. The gate capacitance of the SET depends on the mechanical displacement, thus, the vibrations of the...
Positive cross correlations in a three-terminal quantum dot with ferromagnetic contacts (2004)
Cottet, Audrey, Belzig, Wolfgang, Bruder, Christoph
We study current fluctuations in an interacting three-terminal quantum dot with ferromagnetic leads. For appropriately polarized contacts, the transport through the dot is governed by dynamical spin...
Decoherence of cold atomic gases in magnetic microtraps (2003)
Schroll, Christian, Belzig, Wolfgang, Bruder, Christoph
We derive a model to describe decoherence of atomic clouds in atom-chip traps taking the excited states of the trapping potential into account. We use this model to investigate decoherence for a...
Multiple Andreev reflections in a carbon nanotube quantum dot (2003)
Buitelaar, Mark R., Belzig, Wolfgang, Nussbaumer, Thomas, Babic, Bakir, Bruder, Christoph, Schönenberger, Christian
We report resonant multiple Andreev reflections in a multiwall carbon nanotube quantum dot coupled to superconducting leads. The position and magnitude of the subharmonic gap structure is found to...
Josephson fffect in SFXSF junctions (2002)
Chtchelkatchev, Nikolai M., Belzig, Wolfgang, Bruder, Christoph
We investigate the Josephson effect in SFXSF junctions, where SF is a superconducting material with a ferromagnetic exchange field, and X is a weak link. The critical current Ic increases with the...
Full counting statistics of a superconducting beam splitter (2002)
Börlin, Johannes, Belzig, Wolfgang, Bruder, Christoph
We study the statistics of charge transport in a mesoscopic three-terminal device with one superconducting terminal and two normal-metal terminals. We calculate the full distribution of transmitted...
Pi-o Transition in Superconductor-Ferromagnet-Superconductor Junctions (2001)
Chtchelkatchev, Nikolai M., Belzig, Wolfgang, Nazarov, Yuli V., Bruder, Christoph
Superconductorferromagnetsuperconductor (SFS) Josephson junctions are known to exhibit a transition between Pi and 0 states. In this letter, we find the Pi0 phase diagram of an SFS junction...
Excitation spectrum of mesoscopic proximity structures (2000)
Pilgram, Sebastian, Belzig, Wolfgang, Bruder, Christoph
We investigate one aspect of the proximity effect, viz., the local density of states of a superconductor-normal metal sandwich. In contrast to earlier work, we allow for the presence of an arbitrary...
Broadening of Andreev bound states in d(xx-yy) superconductors. (1999)
Poenicke, Andreas, Barash, Yu.S., Bruder, Christoph, Istyukov, V.
Quasiclassical Green's function approach to mesoscopic superconductivity (1998)
Belzig, Wolfgang, Wilhelm, Frank K., Bruder, Christoph, Schön, Gerd, Zaikin, Andrei D.
Recent experiments on mesoscopic normal-metal--superconductor heterostructures resolve properties on length scales and at low temperatures such that the temperature is below the Thouless energy $k_B...
Belzig, Wolfgang, Bruder, Christoph, Fauchére, Alban L.
We investigate the magnetic response of normal-metalsuperconductor proximity systems for arbitrary concentrations of impurities and at arbitrary temperatures. Using the quasiclassical theory of...
Quasiclassical Theory of Twin Boundaries in High-Tc Superconductors (1998)
Belzig, Wolfgang, Bruder, Christoph, Sigrist, Manfred
We investigate the electronic structure of twin boundaries in orthorhombically distorted high-Tc materials using the quasiclassical theory of superconductivity. At low temperatures we find a local...
Local density of states in a dirty normal metal connected to a superconductor (1998)
Belzig, Wolfgang, Bruder, Christoph, Schön, Gerd
A superconductor in contact with a normal metal not only induces superconducting correlations, known as the proximity effect, but also modifies the density of states at some distance from the...
Aharonov-Bohm-type oscillations of thermopower in a quantum dot ring geometry. (1997)
Blanter, Ya.M., Bruder, Christoph, Fazio, Rosario, Schoeller, Herbert
Photon-assisted transport through ultrasmall quantum dots: influence of intradot transitions. (1997)
Diamagnetic response of normal-metalsuperconductor double layers (1996)
Belzig, Wolfgang, Bruder, Christoph, Schön, Gerd
The magnetic response of a proximity-coupled superconductornormal-metal sandwich is studied within the framework of the quasiclassical theory. The magnetization is evaluated for finite values of...
Do the A4c60 Fullerides Have a Broken-Symmetry Ground State? (1993)
Erwin, Steven C., Bruder, Christoph
Band theory predicts both K3C60 and K4C60 to be metals; various experimental probes show that while K3C60 is indeed metallic, K4C60 appears to be insulating. The standard view of this apparent...
Andreev scattering in anisotropic superconductors / (1989)
Diss. no. 8931 nat. sc. SFIT Zürich.
Andreev scattering in anisotropic superconductors [microform] / (1989)
Thesis (doctoral)--Swiss Federal Institute of Technology, 1989.