Seminar @ DF-TS - Mon 1 Aug 2:00 pm - K. Titimbo - "Distilling entanglement from qubits interacting with local common reservoirs"

[Rosita Glavina - Dip. Fisica UniTS]

  We are pleased to announce the next seminar @ DF-Theory Section UniTs:
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Kelvin Titimbo
Univ. S. Bolivar, Caracas, Venezuela

"Distilling entanglement from qubits interacting with local common 
reservoirs"

Monday, 1 August 2016 - 2:00 pm
Room 204, 2nd floor, LB, Strada Costiera, 11

ABSTRACT:
We study a system composed of four qubits in the presence of two local 
common
reservoirs, their markovian dissipative dynamics corresponding to that 
of vacuum
squeezed reservoirs. We consider two maximally entangled qubits AB as the
source, and two maximally entangled qubits A’B’ as the ancillae. The 
pair AA’
interacts with a common local reservoir in a squeezed vacuum state, 
characterized
by the squeezing parameters r and ϑ; while the pair BB’ interact with 
another
reservoir with identical characteristics. The Lindblad master equation 
is used to
describe the evolution of the whole system, concurrence and fidelity of 
the source
are computed when measurements are performed on the ancillae at time t. For
given initial conditions, concurrence in the source pair reach a 
stationary value
different from zero and its fidelity is f > ½ . For some squeezing 
parameters, a
substantial improvement of the entanglement in the source is obtained 
compared
with other protocols using independent reservoirs.

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