511 citations · 4k across the 79 of their papers we have counts for
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Measurements of Phase Dynamics in Planar Josephson Junctions and SQUIDs
D. Z. Haxell, E. Cheah, F. Křížek +8
We experimentally investigate the stochastic phase dynamics of planar Josephson junctions (JJs) and superconducting quantum interference devices (SQUIDs) defined in epitaxial InAs/…
Controlling charge and spin transport in an Ising-superconductor Josephson junction
Gaomin Tang, Raffael L. Klees, Christoph Bruder +1
An in-plane magnetic field applied to an Ising superconductor converts spin-singlet Cooper pairs to spin-triplet ones. In this work, we study a Josephson junction formed by two Isi…
Signatures of the Higgs mode in transport through a normal-metal--superconductor junction
Gaomin Tang, Wolfgang Belzig, Ulrich Zülicke +1
A superconductor subject to electromagnetic irradiation in the terahertz range can show amplitude oscillations of its order parameter. However, coupling this so-called Higgs mode t…
Chiral 1D Floquet topological insulators beyond rotating wave approximation
Dante M. Kennes, Niclas Müller, Mikhail Pletyukhov +6
We study one-dimensional (1D) Floquet topological insulators with chiral symmetry going beyond the standard rotating wave approximation. The occurrence of many anticrossings betwee…
Spin transport in a graphene normal-superconductor junction in the quantum Hall regime
Tibor Sekera, Christoph Bruder, Rakesh P. Tiwari
The quantum Hall regime of graphene has many unusual properties. In particular, the presence of a Zeeman field opens up a region of energy within the zeroth Landau level, where the…
Interaction-induced time-symmetry breaking in driven quantum oscillators
M. I. Dykman, Christoph Bruder, Niels Lörch +1
We study parametrically driven quantum oscillators and show that, even for weak coupling between the oscillators, they can exhibit various many-body states with broken time-transla…
Indistinguishability of quantum states and rotation counting
Dmitri V. Averin, Christoph Bruder
We propose a quantum system in which the winding number of rotations of a particle around a ring can be monitored and emerges as a physical observable. We explicitly analyze the si…
Noninvasive Quantum Measurement of Arbitrary Operator Order by Engineered Non-Markovian Detectors
Johannes Bülte, Adam Bednorz, Christoph Bruder +1
The development of solid-state quantum technologies requires the understanding of quantum measurements in interacting, non-isolated quantum systems. In general, a permanent couplin…
The topological Anderson insulator phase in the Kane-Mele model
Christoph P. Orth, Tibor Sekera, Christoph Bruder +1
It has been proposed that adding disorder to a topologically trivial mercury telluride/cadmium telluride (HgTe/CdTe) quantum well can induce a transition to a topologically nontriv…
Full counting statistics of Majorana interferometers
Gregory Struebi, Wolfgang Belzig, Thomas L. Schmidt +1
We study the full counting statistics of interferometers for chiral Majorana fermions with two incoming and two outgoing Dirac fermion channels. In the absence of interactions, the…
Quantum synchronization of two Van der Pol oscillators
Stefan Walter, Andreas Nunnenkamp, Christoph Bruder
We study synchronization of two dissipatively coupled Van der Pol oscillators in the quantum regime. Due to quantum noise strict frequency locking is absent and is replaced by a cr…
Josephson effect in normal and ferromagnetic topological insulator planar, step and edge junctions
Jennifer Nussbaum, Thomas L. Schmidt, Christoph Bruder +1
We investigate Josephson junctions on the surface of a three-dimensional topological insulator in planar, step, and edge geometries. The elliptical nature of the Dirac cone represe…
Signatures of tunable Majorana-fermion edge states
Rakesh P. Tiwari, U. Zülicke, C. Bruder
Chiral Majorana-fermion modes are shown to emerge as edge excitations in a superconductor--topological-insulator hybrid structure that is subject to a magnetic field. The velocity…
Quantum synchronization of a driven self-sustained oscillator
Stefan Walter, Andreas Nunnenkamp, Christoph Bruder
Synchronization is a universal phenomenon that is important both in fundamental studies and in technical applications. Here we investigate synchronization in the simplest quantum-m…
Microwave-controlled coupling of Majorana bound states
Thomas L. Schmidt, Andreas Nunnenkamp, Christoph Bruder
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…
Majorana qubit rotations in microwave cavities
Thomas L. Schmidt, Andreas Nunnenkamp, Christoph Bruder
Majorana bound states have been proposed as building blocks for qubits on which certain operations can be performed in a topologically protected way using braiding. However, the se…
Greenberger-Horne-Zeilinger generation protocol for N superconducting transmon qubits capacitively coupled to a quantum bus
Samuel Aldana, Ying-Dan Wang, Christoph Bruder
We propose a circuit quantum electrodynamics (QED) realization of a protocol to generate a Greenberger-Horne-Zeilinger (GHZ) state for superconducting transmon qubits homogeneo…
Ideal Quantum non-demolishing measurement of a flux qubit at variable bias
Ying-Dan Wang, Xiaobo Zhu, Christoph Bruder
We propose a scheme to realize a quantum non-demolition (QND) measurement of a superconducting flux qubit by a Josephson bifurcation amplifier. Our scheme can implement a perfect Q…
Detection of qubit-oscillator entanglement in nanoelectromechanical systems
Thomas L. Schmidt, Kjetil Borkje, Christoph Bruder +1
Experiments over the past years have demonstrated that it is possible to bring nanomechanical resonators and superconducting qubits close to the quantum regime and to measure their…
One-step multi-qubit GHZ state generation in a circuit QED system
Ying-Dan Wang, Stefano Chesi, Daniel Loss +1
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…
Cooling a micro-mechanical resonator by quantum back-action from a noisy qubit
Ying-Dan Wang, Yong Li, Fei Xue +2
We study the role of qubit dephasing in cooling a mechanical resonator by quantum back-action. With a superconducting flux qubit as a specific example, we show that ground-state co…
The single-atom box: bosonic staircase and effects of parity
D. V. Averin, T. Bergeman, P. R. Hosur +1
We have developed a theory of a Josephson junction formed by two tunnel-coupled Bose-Einstein condensates in a double-well potential in the regime of strong atom-atom interaction f…
Improved position measurement of nano electromechanical systems using cross correlations
C. B. Doiron, B. Trauzettel, C. Bruder
We consider position measurements using the cross-correlated output of two tunnel junction position detectors. Using a fully quantum treatment, we calculate the equation of motion…
Spin-transfer torque in magnetic multilayer nanopillars
J. Peguiron, M. -S. Choi, C. Bruder
We consider a quasi one-dimensional configuration consisting of two small pieces of ferromagnetic material separated by a metallic one and contacted by two metallic leads. A spin-p…