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12 papers · 2 filters
Mutual information-energy inequality for thermal states of a bipartite quantum system
Aleksey Fedorov, Evgeny Kiktenko
In this work, we consider an upper bound for the quantum mutual information in thermal states of a bipartite quantum system. This bound is related with the interaction energy and l…
Coherent control of light transport in a dense and disordered atomic ensemble
A. S. Sheremet, D. F. Kornovan, L. V. Gerasimov +3
Light transport in a dense and disordered cold atomic ensemble, where the cooperation of atomic dipoles essentially modifies their coupling with the radiation modes, offers an alte…
Multilevel superconducting circuits as two-qubit systems: Operations, state preparation, and entropic inequalities
E. O. Kiktenko, A. K. Fedorov, O. V. Man'ko +1
We theoretically study operations with a four-level superconducting circuit as a two-qubit system. Using a mapping on a two-qubit system, we show how to implement iSWAP gates and H…
PPT-inducing, distillation-prohibiting, and entanglement-binding quantum channels
Sergey N. Filippov
Entanglement degradation in open quantum systems is reviewed in the Choi-Jamiołkowski representation of linear maps. In addition to physical processes of entanglement dissociation…
Tomographic discord for a system of two coupled nanoelectric circuits
A. K. Fedorov, E. O. Kiktenko, O. V. Man'ko +1
We consider quantum correlations and quantum discord phenomena for two-qubit states with -type density matrices in the tomographic framework of quantum mechanics. By introducing…
Quantum vampire: collapse-free action at a distance by the photon annihilation operator
Ilya A. Fedorov, Alexander E. Ulanov, Yury V. Kurochkin +1
A nonclassical state of light is distributed, via a beam splitter, between two remote parties. One of the parties applies the photon annihilation operator to its portion of the sta…