Two-state behavior in N-state quantum systems: The Morris–Shore transformation reviewed

BW Shore - Journal of Modern Optics, 2014 - Taylor & Francis
Descriptions of coherent excitation of multi-state quantum systems model changes through
coupled ordinary differential equations that become more cumbersome as the number of …

Two-dimensional cluster-state preparation with linear ion traps

H Wunderlich, C Wunderlich, K Singer… - Physical Review A …, 2009 - APS
We present schemes to prepare two-dimensional cluster states [HJ Briegel and R.
Raussendorf, Phys. Rev. Lett. 86, 910 (2001)] with atomic ions confined in a microstructured …

Parameter estimation with cluster states

M Rosenkranz, D Jaksch - Physical Review A—Atomic, Molecular, and Optical …, 2009 - APS
We propose a scheme for parameter estimation with cluster states. We find that phase
estimation with cluster states under a many-body Hamiltonian and separable measurements …

Bipartite quantum channels using multipartite cluster-type entangled coherent states

PP Munhoz, JA Roversi, A Vidiella-Barranco… - Physical Review A …, 2010 - APS
We propose a particular encoding for bipartite entangled states derived from multipartite
cluster-type entangled coherent states (CTECSs). We investigate the effects of amplitude …

Optimal verification of entanglement in a photonic cluster state experiment

H Wunderlich, G Vallone, P Mataloni… - New Journal of …, 2011 - iopscience.iop.org
We report on the quantification of entanglement by means of entanglement measures on a
four-and a six-qubit cluster state realized by using photons entangled both in polarization …

Highly efficient estimation of entanglement measures for large experimentally created graph states via simple measurements

H Wunderlich, S Virmani, MB Plenio - New Journal of Physics, 2010 - iopscience.iop.org
Quantifying experimentally created entanglement could in principle be accomplished by
measuring the entire density matrix and calculating an entanglement measure of choice …

Quantum gate in the decoherence-free subspace of trapped-ion qubits

PA Ivanov, UG Poschinger, K Singer… - Europhysics …, 2010 - iopscience.iop.org
We propose a geometric phase gate in a decoherence-free subspace with trapped ions. The
quantum information is encoded in the Zeeman sublevels of the ground state and two …

Multipartite entangled states with two bosonic modes and qubits

PP Munhoz, FL Semião - The European Physical Journal D, 2010 - Springer
We theoretically investigate the role of different phases of coupling constants in the
dynamics of atoms and two cavity modes, observing deterministic generation of prototype or …

Generation of singlet states with Rydberg blockade mechanism and driven by adiabatic passage

RC Yang, X Lin, LX Ye, X Chen, J He… - Quantum Information …, 2016 - Springer
A single state is a special state that entangles multi-state quantum systems and plays a
significant role in the field of quantum computation. In this paper, we propose a scheme to …

Phase shifts in nonresonant coherent excitation

BT Torosov, NV Vitanov - Physical Review A—Atomic, Molecular, and Optical …, 2009 - APS
Far-off-resonant pulsed laser fields produce negligible excitation between two atomic states
but may induce considerable phase shifts. The acquired phases are usually calculated by …