Atomic clocks, the most accurate instruments ever developed, can now operate at the Standard Quantum Limit; their uncertainty dominated by the uncorrelated projection of individual atoms into eigenstates. Using entanglement, quantum mechanics allows one to correlate the atoms so as to redistribute or squeeze such quantum noise, reducing the uncertainty in a variable of interest.
A. Widera, S. Trotzky, P. Cheinet, S. Foelling, F. Gerbier, M. D. Lukin, E. Demler, I. Bloch, and V. Gritsev, Quantum Spin Dynamics of Mode-Squeezed Luttinger Liquids in Two-Component Atomic Gases, Phys. Rev. Lett. 100, 140401 (2008).
The pairing of fermions is at the heart of superconductivity and superfluidity. The stability of these pairs determines the robustness of the superfluid state, and the quest for superconductors with high critical temperature is a search for systems with strong pairing mechanisms. Ultracold atomic Fermi gases have emerged as a highly controllable model system for...
A. Gorshkov, P. R. G. Pupillo, A. Micheli, P. Zoller, M. D. Lukin, and H. P. Buchler, Suppression of Inelastic Collisions between Polar Molecules with a Repulsive Shield, Phys. Rev. Lett. 101, 073201 (2008).
N. Brahms, B. Newman, C. Johnson, T. Greytak, D. Kleppner, and J. M. Doyle, Magnetic Trapping of Silver and Copper, and Anomalous Spin Relaxation in the Ag-He System, Phys. Rev. Lett. 101, 103002 (2008).