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14 papers · 2 filters
Experimental investigation of enviroment--induced entanglement using an all--optical setup
M. H. M. Passos, W. F. Balthazar, A. Z. Khoury +3
We investigate the generation of entanglement between two non interacting qubits coupled to a common reservoir. An experimental setup was conceived to encode one qubit on the polar…
Intrinsic bounds of a two-qudit random evolution
A. Z. Khoury, A. M. Souza, L. E. Oxman +3
We investigate entangled qudits evolving under random, local operations and demonstrate that this evolution is constrained by intrinsic bounds, showing robust features of t…
Violation of the Bell inequality in quantum critical random spin- chains
João C. Getelina, Thiago R. de Oliveira, José A. Hoyos
We investigate the entanglement and nonlocality properties of two random XX spin-1/2 critical chains, in order to better understand the role of breaking translational invariance to…
Photonic Counterparts of Cooper Pairs
Andre Saraiva, Filomeno S. de Aguiar Junior, Reinaldo de Melo e Souza +5
The microscopic theory of superconductivity raised the disruptive idea that electrons couple through the elusive exchange of virtual phonons, overcoming the strong Coulomb repulsio…
The Unruh Quantum Otto Engine
Enrique Arias, Thiago R. de Oliveira, M. S. Sarandy
We introduce a quantum heat engine performing an Otto cycle by using the thermal properties of the quantum vacuum. Since Hawking and Unruh, it has been established that the vacuum…
Mutual Unbiasedness in Coarse-grained Continuous Variables
Daniel S. Tasca, Piero Sánchez, Stephen P. Walborn +1
The notion of mutual unbiasedness for coarse-grained measurements of quantum continuous variable systems is considered. It is shown that while the procedure of "standard" coarse gr…