Entanglement in the Bogoliubov vacuum
We analyze the entanglement properties of the Bogoliubov vacuum, which is obtained as a second-order approximation to the ground state of an interacting Bose-Einstein condensate. We work on one- and two-dimensional lattices and study the entanglement between two groups of lattice sites as a function...
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| Veröffentlicht in: | Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2005-06, Vol.71 (6), Article 063605 |
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| container_title | Physical review. A, Atomic, molecular, and optical physics |
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| creator | Poulsen, U. V. Meyer, T. Lewenstein, M. |
| description | We analyze the entanglement properties of the Bogoliubov vacuum, which is obtained as a second-order approximation to the ground state of an interacting Bose-Einstein condensate. We work on one- and two-dimensional lattices and study the entanglement between two groups of lattice sites as a function of the geometry of the configuration and the strength of the interactions. As our measure of entanglement we use the logarithmic negativity, supplemented by an algorithmic check [G. Giedke et al., Phys. Rev. Lett. 87, 167904 (2001)] for bound entanglement where appropriate. The short-range entanglement is found to grow approximately linearly with the group sizes and to be favored by strong interactions. Conversely, long-range entanglement is favored by relatively weak interactions. No examples of bound entanglement are found. |
| doi_str_mv | 10.1103/PhysRevA.71.063605 |
| format | Article |
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| source | American Physical Society Journals |
| subjects | ATOMIC AND MOLECULAR PHYSICS BOSE-EINSTEIN CONDENSATION GEOMETRY GROUND STATES QUANTUM ENTANGLEMENT STRONG INTERACTIONS TWO-DIMENSIONAL CALCULATIONS WEAK INTERACTIONS |
| title | Entanglement in the Bogoliubov vacuum |
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