104 citations · 299 across the 7 of their papers we have counts for
7 papers
Dispersive readout scheme for a Josephson phase qubit
T. Wirth, J. Lisenfeld, A. Lukashenko +1
We present experimental results on a dispersive scheme for reading out a Josephson phase qubit. A capacitively shunted dc-SQUID is used as a nonlinear resonator which is inductivel…
A Superconducting 180° Hybrid Ring Coupler for circuit Quantum Electrodynamics
E. Hoffmann, F. Deppe, T. Niemczyk +11
Superconducting circuit quantum electrodynamics experiments with propagating microwaves require devices acting as beam splitters. Using niobium thin films on silicon and sapphire s…
Functional Bethe ansatz methods for the open XXX chain
Holger Frahm, Jan H. Grelik, Alexander Seel +1
We study the spectrum of the integrable open XXX Heisenberg spin chain subject to non-diagonal boundary magnetic fields. The spectral problem for this model can be formulated in te…
Separation of variables for integrable spin-boson models
Luigi Amico, Holger Frahm, Andreas Osterloh +1
We formulate the functional Bethe ansatz for bosonic (infinite dimensional) representations of the Yang-Baxter algebra. The main deviation from the standard approach consists in a…
The XXZ model with anti-periodic twisted boundary conditions
Sönke Niekamp, Tobias Wirth, Holger Frahm
We derive functional equations for the eigenvalues of the XXZ model subject to anti-diagonal twisted boundary conditions by means of fusion of transfer matrices and by Sklyanin's m…
Non-linear Integral Equations and Determinant Formulae of the Open XXZ Spin Chain
A. Seel, T. Wirth
We derive a non-linear integral equation for the Bethe-ansatz solvable open XXZ spin chain of arbitrary length describing the lowest lying state with zero magnetization. For this c…