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10 papers · 2 filters
Dimension witnesses and quantum state discrimination
Nicolas Brunner, Miguel Navascués, Tamás Vértesi
Dimension witnesses allow one to test the dimension of an unknown physical system in a device-independent manner, that is, without placing assumptions about the functioning of the…
Algorithmic Superactivation of Asymptotic Quantum Capacity of Zero-Capacity Quantum Channels
Laszlo Gyongyosi, Sandor Imre
The superactivation of zero-capacity quantum channels makes it possible to use two zero-capacity quantum channels with a positive joint capacity for their output. Currently, we hav…
Closing the detection loophole in multipartite Bell tests using GHZ states
Karoly F. Pal, Tamas Vertesi, Nicolas Brunner
We investigate the problem of closing the detection loophole in multipartite Bell tests, and show that the required detection efficiencies can be significantly lowered compared to…
All quantum states useful for teleportation are nonlocal resources
Daniel Cavalcanti, Antonio Acin, Nicolas Brunner +1
Understanding the relation between the different forms of inseparability in quantum mechanics is a longstanding problem in the foundations of quantum theory and has implications fo…
Persistency of entanglement and nonlocality in multipartite quantum systems
Nicolas Brunner, Tamas Vertesi
The behaviour under particle loss of entanglement and nonlocality is investigated in multipartite quantum systems. In particular, we define a notion of persistency of nonlocality,…
Adequacy of the Dicke model in cavity QED: a counter-"no-go" statement
András Vukics, Peter Domokos
The long-standing debate whether the phase transition in the Dicke model can be realized with dipoles in electromagnetic fields is yet an unsettled one. The well-known statement of…