Entanglement driven self-organization via a quantum seesaw mechanism

Details Entanglement driven self-organization via a quantum seesaw mechanism Entanglement driven self-organization via a quantum seesaw mechanism

2005-12-13

arxiv.org/abs/quant-ph/0512101v1

Physics

Quantum Physics

4 pages, 6 figures

Scientific paper

Atom-field entanglement is shown to play a crucial role for the onset of spatial self-organization of ultracold atoms in an optical lattice within a high-Q cavity. Like particles on a seesaw, the atoms feel a different potential depending on their spatial distribution. The system possesses two stable configurations, where all atoms occupy either only even or only odd lattice sites. While for a classical cavity field description a distribution balanced between even and odd sites is a stationary equilibrium state at zero temperature, the possibility of atom-field entanglement in a quantum field description yields an instant simultaneous decay of the homogeneous atomic cloud into an entangled superposition of the two stable atomic patterns correlated with different cavity fields. This effect could be generic for a wide class of quantum phase transitions, whenever the quantum state can act back on the control parameter.

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