Fortschritte der Physik

Cover image for Vol. 61 Issue 9

September 2013

Volume 61, Issue 9

Pages 779–870

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
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      Cover Picture: Fortschritte der Physik 9 / 2013

      Version of Record online: 2 SEP 2013 | DOI: 10.1002/prop.201370073

      Thumbnail image of graphical abstract

      The cover page shows snapshots of a decaying Schrödinger cat Wigner function. This is a quasi-probability distribution for the amplitude of a microwave field stored in an ultra-high quality superconducting cavity. A single circular Rydberg atom interacting with a coherent state produces a quantum superposition of two fields with different phases. The two positive peaks in the Wigner function (front) are centered on the classical amplitudes of these components. The interference pattern in-between indicates the quantum nature of the superposition. As time proceeds (from front to rear), the interference pattern vanishes, revealing the rapid decoherence of a mesoscopic quantum state superposition.

  2. Issue Information

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. You have free access to this content
      Issue Information: Fortschritte der Physik 9 / 2013

      Version of Record online: 2 SEP 2013 | DOI: 10.1002/prop.201370074

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. You have free access to this content
  4. Original Papers

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. You have free access to this content
      Cool horizons for entangled black holes (pages 781–811)

      J. Maldacena and L. Susskind

      Version of Record online: 1 AUG 2013 | DOI: 10.1002/prop.201300020

      Thumbnail image of graphical abstract

      General relativity contains solutions in which two distant black holes are connected through the interior via a wormhole, or Einstein-Rosen bridge. These solutions can be interpreted as maximally entangled states of two black holes that form a complex EPR pair. The authors suggest that similar bridges might be present for more general entangled states. In the case of entangled black holes one can formulate versions of the AMPS(S) paradoxes and resolve them. Possible resolutions of the firewall paradoxes for more general situations might emerge.

    2. You have free access to this content
      Polylogarithms, multiple zeta values and superstring amplitudes (pages 812–870)

      J. Broedel, O. Schlotterer and S. Stieberger

      Version of Record online: 1 AUG 2013 | DOI: 10.1002/prop.201300019

      Thumbnail image of graphical abstract

      A formalism is provided to calculate tree amplitudes in open superstring theory for any multiplicity at any order in the inverse string tension. In particular, the world-sheet integrands of open-string tree amplitudes are closely related to the Kawai-Lewellen-Tye representation of supergravity amplitudes. This helps to reduce the singular parts of world-sheet disk integrals – including their string corrections – to lower-point results.

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