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- Centre National de la Recherche ScientifiqueFR256 papers
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20 papers · 2 filters
Are right angles special? The optimal primitive reference frame
David Jennings
We consider the smallest possible directional reference frames allowed and determine the best one can ever do in preserving quantum information in various scenarios. We find that f…
Controlling qubit arrays with anisotropic XXZ Heisenberg interaction by acting on a single qubit
Rahel Heule, C. Bruder, Daniel Burgarth +1
We investigate anisotropic Heisenberg spin-1/2 chains with control fields acting on one of the end spins, with the aim of exploring local quantum control in arrays of interac…
Wave packet evolution in non-Hermitian quantum systems
Eva-Maria Graefe, Roman Schubert
The quantum evolution of the Wigner function for Gaussian wave packets generated by a non-Hermitian Hamiltonian is investigated. In the semiclassical limit this yields…
Coherent and incoherent dynamics in excitonic energy transfer: correlated fluctuations and off-resonance effects
Dara P. S. McCutcheon, Ahsan Nazir
We study the nature of the energy transfer process within a pair of coupled two-level systems (donor and acceptor) subject to interactions with the surrounding environment. Going b…
Quantum counterpart of spontaneously broken classical PT symmetry
Carl M. Bender, Hugh F. Jones
The classical trajectories of a particle governed by the PT-symmetric Hamiltonian () have been studied in depth. It is known that almost all trajectories…
Optical pumping into many-body entanglement
Jaeyoon Cho, Sougato Bose, M. S. Kim
We propose a scheme of optical pumping by which a system of atoms coupled to harmonic oscillators is driven to an entangled steady state through the atomic spontaneous emission. It…