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• Extremely useful to derive theExtremely useful to derive the classical macrodynamicsclassical macrodynamics from thefrom the quantum microdynamics (Ghiradi-Rimini- quantum microdynamics (Ghiradi-Rimini-Weber)Weber)
• Extremely dangerous inExtremely dangerous in quantum information quantum information andand computation computation based on persistencebased on persistence of linear of linear superpositionssuperpositions
• non-directly interacting non-directly interacting quantum systemsquantum systems in a in a same environmentsame environment may interactmay interact through the environmentthrough the environment andand become become entangledentangled
EES1S1
S2S2
A Theoretical and Experimental ScenarioA Theoretical and Experimental Scenario: Bose-Einstein Condensates (BEC)Bose-Einstein Condensates (BEC)
• Laser coolingLaser cooling• Magnetic trappingMagnetic trapping• Evaporative coolingEvaporative cooling
• Rubidium-87 atomsRubidium-87 atoms condensed condensed at the temperature ofat the temperature of in in 1D1D wells of width wells of width
105
50nK10¹m
400400 nK nK
200200 nK nK
5050 nK nK
BEC BEC in Double Well TrapsDouble Well Traps
Noise on the tunneling barrierNoise on the tunneling barrier
What are the effects of the environment?What are the effects of the environment?It decoheres, but not only. On short times,It decoheres, but not only. On short times,
• It can generate a current in an otherwise insulating state (poster S. Anderloni);
• it can generate entanglement in an otherwise separable state (poster A.M. Liguori);
• It can measurably alter transmission and reflection coefficients (poster G. Moras);• it allows to study the wave packet reduction in
an almost mesoscopic context: currently under study together with the experimental group of M. Inguscio at LENS (Florence)