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26.
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Physics 2, 41 (2009) – Published May 18, 2009 Atomic & Molecular Physics Quantum Information Optics Loading cold atoms into a hollow-core optical fiber enables all-optical switching with just several hundred photons. |
27.
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Physics 2, 31 (2009) – Published April 20, 2009 In a cooled and trapped cloud of ytterbium atoms, the transition from a superfluid to an insulating state has been observed, opening up new possibilities for precision measurements, optical clocks, and quantum computing. |
28.
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Physics 2, 29 (2009) – Published April 13, 2009 Inelastic light scattering is used to study correlated phases of one-dimensional Bose gases. This spectroscopic technique can distinguish superfluid and insulating phases and allow identification of the transition from one to the other. |
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Physics 2, 26 (2009) – Published April 6, 2009 An ultracold atomic physics experiment reveals universal physics in a four-body system. |
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Physics 2, 25 (2009) – Published March 30, 2009 Trapped cold atom gases mimic much of the behavior of electrons in a solid, but because the atoms are neutral, it is difficult to imitate the physics of electrons moving in a magnetic field. Now, experiments show that a suitable combination of lasers can create an artificial magnetic field for cold atoms. |
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Physics 2, 23 (2009) – Published March 23, 2009 Atomic & Molecular Physics Interdisciplinary Physics Stochastic resonance, in which a periodic signal applied to a nonlinear system can be amplified by adding noise, has been observed in a mechanical system and predicted to occur in a Bose-Einstein condensate. |
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Published March 16, 2009 New measurements have pinned down the frequency of a long-lived optical transition in ytterbium with the potential for better atomic clocks. |
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Physics 2, 19 (2009) – Published March 9, 2009 An atomic physics experiment demonstrates a solution to an eighty-year-old quantum conundrum by mimicking in an atom the astronomical problem of a satellite moving in a sun-earth system. |
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Published March 9, 2009 The hyperfine levels of a calcium ion form the basis of a qubit that stores quantum information with high fidelity for nearly 100 ms. |
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Physics 2, 9 (2009) – Published February 2, 2009 Atomic & Molecular Physics Superfluidity Recent calculations of the properties of ultracold atoms have revealed how two-body interactions at very short distances determine essential properties of many-body systems. |
36.
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Published January 22, 2009 Trapping atoms inside of a submicron volume for applications such as quantum computing and nanoscale optics poses a host of experimental difficulties. One idea for doing this takes advantage of the strong electric field that can be excited on the surface of metal nanoparticles. |
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Published January 16, 2009 Ultracold atoms in an optical lattice share a lot of physics with electrons in a crystalline solid and it is a system that is often much easier to control. By forcing an optical lattice to vary with time, it is possible to engineer the energy of cold atoms and essentially bring them to a halt. |
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Published December 22, 2008 A new method for computing electron properties in many-electron molecules yields better results at lower computational cost. |
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Physics 1, 41 (2008) – Published December 15, 2008 Disorder in a crystal tends to localize electrons and drive a transition from a metallic to an insulating state. The same localization can occur in cold atom gasses in a periodic optical trap, but since the trap is tunable it may be possible to explore this effect in multiple dimensions. |
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Published December 15, 2008 Atomic & Molecular Physics Optics Lasers can make an opaque material transparent, but to determine how long this state survives, you have to shut off the lights. |
41.
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Published October 30, 2008 Atomic & Molecular Physics Optics Successive and rapid measurements of a quantum system can prevent it from evolving in time. This quantum Zeno effect has now been demonstrated for light inside a cavity. |
42.
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Physics 1, 27 (2008) – Published October 6, 2008 Spin dependence of atomic and electronic interactions can give rise to propagating regions of aligned spins in solids called spin waves. These have now been observed in a gas of ultracold fermionic atoms. |
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Physics 1, 25 (2008) – Published September 29, 2008 Paramagnetic atoms and molecules experience a force in a magnetic field and scientists have now used this force to decelerate and trap hydrogen atoms. This method promises new opportunities for precision measurements on hydrogen isotopes and may be applied to a host of atoms and molecules for which existing cooling techniques fail. |
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Physics 1, 24 (2008) – Published September 25, 2008 Atoms colliding in a magnetic field can form weakly bound states called Feshbach molecules. These states have now been used in combination with advanced laser techniques to create tightly bound ground-state molecules close to quantum degeneracy. |
45.
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Published September 22, 2008 Tuning the interactions between ultracold atoms leads to a strongly interacting superfluid with properties more akin to liquid helium than a dilute Bose-Einstein condensate. |
46.
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Published September 9, 2008 Atoms subjected to strong optical fields exhibit splitting of energy levels. The same effect has now been observed when an atom moves through the periodic field of a crystal lattice. |
47.
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Published September 2, 2008 When an atom is bombarded with just enough energy to fully ionize it, how do the electrons and nucleus break apart from each other? Experimentalists are now able to study such a four-body breakup by bombarding a helium atom with an electron. |
48.
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Physics 1, 13 (2008) – Published August 18, 2008 A Bose-Einstein condensate (BEC) can dramatically collapse and explode when the interactions between the atoms are sufficiently strong and attractive. Now, scientists have imaged the anisotropic, clover-leaf shape of such a collapsing gas when the attractive atomic interactions are strongly dipolar. |
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Physics 1, 10 (2008) – Published August 4, 2008 Atomic & Molecular Physics String Theory Results from string theory, generalizing the anti-de Sitter/conformal field theory correspondence, may offer a fresh set of mathematical tools for understanding some kinds of phase transitions that occur in cold atomic systems. |
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Published July 28, 2008 The atoms in highly excited vibrational states of a diatomic molecule can be quite far apart near their maximum excursion. Physicists are now using laser spectroscopy to carefully measure the long-range effective interaction between potassium atoms in these states—an essential parameter to understanding ultracold atomic collisions. |
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