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Volume 4 Issue 6, June 2008

Solitons are encountered in a wide range of nonlinear systems, in water channels and in optical fibres, but also in Bose–Einstein condensates (BECs). Christoph Becker and colleagues now study the dynamics of 'BEC solitons' in detail. They create dark solitons — basically a notch in the condensate — as well as dark–bright solitons, where the notch is filled with atoms in another quantum state (the cover pictures the two components of such a dark–bright soliton). The experiments reveal the solitons' particle-like motion, including collisions between the two types of solitons. Article p496; News & Views p437

Cover design by David Shand

Volume 4 Issue 6

Editorial

  • Presenting your research to an auditorium of peers can be a daunting prospect, particularly for those at the start of their careers. But with a little thought and preparation, it needn't be.

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News & Views

  • Dark solitons in Bose–Einstein condensates have been made to live long enough for their dynamical properties to be observed. They might serve as a sensitive probe of the rich physics at the mesoscale.

    • James Anglin
    News & Views
  • The most precise calculations yet of how two quarks locked in a bound state annihilate have been achieved using lattice quantum chromodynamics — and signal a curious discrepancy.

    • Ian Shipsey
    News & Views
  • Gravitational wave detectors based on laser interferometry have reached an incredible level of sensitivity. But to develop to the level needed to explore the Universe, the next generation of detectors will probably need to use squeezed light.

    • Roman Schnabel
    News & Views
  • Many have reported evidence for a quantum spin liquid state — in which quantum fluctuations prevent spin order — but thermodynamic evidence has been lacking, until now. Although it points the way, is it enough?

    • Arthur P. Ramirez
    News & Views
  • Unprecedented control over the superposition of electronic states in a 'quantum corral', exerted by changing the position of a single atom within it, provides a powerful tool for studying the quantum behaviour of matter.

    • Eric J. Heller
    News & Views
  • The standard assumption in thermodynamics that a sufficiently slow change of external parameters will generate no entropy turns out to be wrong for low-dimensional, gapless systems. Its breakdown may be tested with ultracold gases.

    • Wilhelm Zwerger
    News & Views
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Review Article

  • The development of compact plasma accelerators, enabled by the advent of high-power lasers, could revolutionize the use of particle beams. This review presents the physical principles that underlie such devices and provides an outlook on the possibilities.

    • Victor Malka
    • Jérôme Faure
    • Kim Ta Phuoc
    Review Article
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Letter

  • Unprecedented control over the superposition of electronic states of a ‘quantum coral’, by changing the position of a single atom within it, provides a powerful tool for studying the quantum behaviour of matter.

    • Christopher R. Moon
    • Christopher P. Lutz
    • Hari C. Manoharan
    Letter
  • Spins in a two-dimensional triangular lattice are geometrically frustrated and cannot form an ordered ground state. Instead, a spin-liquid state is expected, and now thermodynamic measurements suggest that a spin liquid exists down to the lowest temperatures.

    • Satoshi Yamashita
    • Yasuhiro Nakazawa
    • Kazushi Kanoda
    Letter
  • Like their classical counterparts, quantum computers can, in theory, cope with imperfections—provided that these are small enough. The regime of fault-tolerant quantum computing has now been reached for a system based on trapped ions, in which a gate operation for entangling qubits has been implemented with a fidelity exceeding 99%.

    • Jan Benhelm
    • Gerhard Kirchmair
    • Rainer Blatt
    Letter
  • Four electrons in a semiconductor quantum dot exhibit similar correlation effects to those found in a molecule. Excitations of these electrons can be probed by inelastic light scattering, which reveals a decoupling of their rigid rotational motion from their spin excitations.

    • Sokratis Kalliakos
    • Massimo Rontani
    • Ken W. West
    Letter
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Article

  • When a thermodynamic system is changed sufficiently slowly, entropy is generally conserved and the process is adiabatic, and therefore reversible. However, this adiabaticity does not seem to hold for low-dimensional systems with a high-density of low-energy states.

    • Anatoli Polkovnikov
    • Vladimir Gritsev
    Article
  • A proposal describes how to detect topologically ordered states of ultracold matter in an optical lattice, and shows how these exotic states, which strongly correlated quantum systems can exhibit, could be harnessed for practical applications, such as robust quantum computation.

    • Liang Jiang
    • Gavin K. Brennen
    • Peter Zoller
    Article
  • The analysis of the interference fringes generated by initially independent one-dimensional Bose condensates reveals contributions of both quantum noise and thermal noise, advancing our fundamental understanding of quantum states in interacting many-body systems.

    • S. Hofferberth
    • I. Lesanovsky
    • J. Schmiedmayer
    Article
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