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Distillability and partial transposition in bipartite systems
W. Dür, J. I. Cirac, M. Lewenstein +1
We study the distillability of a certain class of bipartite density operators which can be obtained via depolarization starting from an arbitrary one. Our results suggest that non-…
Optical Generation of Vortices in trapped Bose-Einstein Condensates
L. Dobrek, M. Gajda, M. Lewenstein +3
We demonstrate numerically the efficient generation of vortices in Bose-Einstein condensates (BEC) by using a ``phase imprinting'' method. The method consist of passing a far off r…
Collisional effects on the collective laser cooling of trapped bosonic gases
Luis Santos, Maciej Lewenstein
We analyse the effects of atom-atom collisions on collective laser cooling scheme. We derive a quantum Master equation which describes the laser cooling in presence of atom-atom co…
Separability and entanglement in 2xN composite quantum systems
M. Lewenstein, J. I. Cirac, S. Karnas
We show that all density operators of 2--dimensional quantum systems that remain invariant after partial transposition with respect to the first system are separable. Bas…
Quantum Anti-Zeno Effect
Maciej Lewenstein, Kazimierz Rzazewski
We demonstrate that near threshold decay processes may be accelerated by repeated measurements. Examples include near threshold photodetachment of an electron from a negative ion,…