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Standard super-activation for Gaussian channels requires squeezing
Daniel Lercher, Géza Giedke, Michael M. Wolf
The quantum capacity of bosonic Gaussian quantum channels can be non-additive in a particularly striking way: a pair of such optical-fiber type channels can individually have zero…
Dissipative spin chains: Implementation with cold atoms and steady-state properties
Heike Schwager, J. Ignacio Cirac, Géza Giedke
We propose a quantum optical implementation of a class of dissipative spin systems, including the XXZ and Ising model, with ultra-cold atoms in optical lattices. Employing the moti…
Dissipative Dynamics and Phase Transitions in Fermionic Systems
Birger Horstmann, J. Ignacio Cirac, Géza Giedke
We study abrupt changes in the dynamics and/or steady state of fermionic dissipative systems produced by small changes of the system parameters. Specifically, we consider open ferm…
Dissipative Phase Transition in Central Spin Systems
Eric M. Kessler, Geza Giedke, Atac Imamoglu +3
We investigate dissipative phase transitions in an open central spin system. In our model the central spin interacts coherently with the surrounding many-particle spin environment…