Physics – Quantum Physics
Scientific paper
2006-09-26
J. Opt. Soc. Am. B 27, A30-A35 (2010)
Physics
Quantum Physics
Scientific paper
10.1364/JOSAB.27.000A30
I show how to perform a Loschmidt echo (time reversal) in the Bose-Hubbard model implemented with cold bosonic atoms in an optical lattice. The echo is obtained by applying a linear phase imprint on the lattice and a change in magnetic field to tune the boson-boson scattering length through a Feshbach resonance. I discuss how the echo can measure the fidelity of the quantum simulation, the intensity of an external potential (e.g. gravity), or the critical point of the superfluid-insulator quantum phase transition.
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