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8 papers · 2 filters
Coupling molecular spin states by photon-assisted tunneling
L. R. Schreiber, F. R. Braakman, T. Meunier +5
Artificial molecules containing just one or two electrons provide a powerful platform for studies of orbital and spin quantum dynamics in nanoscale devices. A well-known example of…
Entangled inputs cannot make imperfect quantum channels perfect
Fernando G. S. L. Brandao, Jens Eisert, Michal Horodecki +1
Entangled inputs can enhance the capacity of quantum channels, this being one of the consequences of the celebrated result showing the non-additivity of several quantities relevant…
The optimal unitary dilation for bosonic Gaussian channels
Filippo Caruso, Jens Eisert, Vittorio Giovannetti +1
A generic quantum channel can be represented in terms of a unitary interaction between the information-carrying system and a noisy environment. Here, the minimal number of quantum…
Monotonically convergent optimization in quantum control using Krotov's method
Daniel Reich, Mamadou Ndong, Christiane P. Koch
The non-linear optimization method developed by Konnov and Krotov [Automation and Remote Control 60, 1427 (1999)] has been used previously to extend the capabilities of optimal con…
Preparing the bound instance of quantum entanglement
J. DiGuglielmo, A. Samblowski, B. Hage +3
Among the possibly most intriguing aspects of quantum entanglement is that it comes in "free" and "bound" instances. Bound entangled states require entangled states in preparation…
Extracting dynamical equations from experimental data is NP-hard
Toby S. Cubitt, Jens Eisert, Michael M. Wolf
The behavior of any physical system is governed by its underlying dynamical equations. Much of physics is concerned with discovering these dynamical equations and understanding the…