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Volume 8 Issue 2, February 2014

A silicon-on-insulator device that combines two four-wave-mixing sources in an interferometer with a reconfigurable phase shifter is presented. It does not require any external photon sources, and represents a first step towards realizing fully integrated quantum technologies.

Letter p104; Interview p160

IMAGE: YUE ZHANG, JOSH SILVERSTONE, DAMIEN BONNEAU AND MARK THOMPSON

COVER DESIGN: TOM WILSON

Volume 8 Issue 2

Editorial

  • When promoting the value of their research or procuring funding, researchers often need to explain the significance of their work to the community — something that can be just as tricky as the research itself.

    Editorial

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Interview

  • Michele Svandrlik and Fulvio Parmigiani, respectively Project Director and Head of Science at FERMI, talk to Nature Photonics about building the first fully coherent seeded free-electron laser that outputs soft X-rays.

    • David Pile
    Interview
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Research Highlights

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News & Views

  • Reports of perovskite solar cells fabricated at temperatures compatible with polymer substrates indicate that high-performance flexible cells are now an exciting proposition. However, increasing the cell area and stability and addressing environmental concerns are aspects requiring attention.

    • Gary Hodes
    • David Cahen
    News & Views
  • An engineered defect in silicon carbide that acts as an artificial molecule is found to be the brightest room-temperature source of single photons presently available in a bulk material. This finding suggests that silicon carbide has a promising future for applications in quantum information processing.

    • Alberto Boretti
    News & Views
  • Quantum information processing provides novel methods for pumping heat and refrigerating photons. Devices that obtain and manipulate information at the quantum level can function as quantum 'Maxwell's demons' to cool systems in ways that liquid helium cannot.

    • Seth Lloyd
    News & Views
  • Researchers have demonstrated high-harmonic generation using strong terahertz pulses in a bulk solid without damaging it. The mechanism underpinning such an extreme nonlinearity also generates coherent electromagnetic radiation covering the terahertz, infrared and optical regions.

    • K. Y. Kim
    • Y. S. You
    News & Views
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Correction

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Review Article

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Letter

  • A silicon-on-insulator device combining two four-wave-mixing photon-pair sources in an interferometer with a reconfigurable phase shifter is used to create and manipulate non-degenerate or degenerate, path-entangled or path-unentangled photon pairs. A quantum interference visibility of nearly 100% is observed on-chip. This device is a first step towards fully integrated quantum technologies.

    • J. W. Silverstone
    • D. Bonneau
    • M. G. Thompson
    Letter
  • Single-step fabrication of a multimode quantum resource from the parametric downconversion of femtosecond frequency combs is demonstrated. Each of the 511 possible bipartitions among ten spectral regions is shown to be entangled. Furthermore, an eigenmode decomposition reveals that eight independent quantum channels (qumodes) are subsumed within the comb.

    • Jonathan Roslund
    • Renné Medeiros de Araújo
    • Nicolas Treps
    Letter
  • A universal pseudo-cooling method based on a Maxwell-demon-like swapping sequence is proposed. A controlled Hamiltonian gate is used to identify lower energy states of the system and to drive the system to those states. An experimental implementation using a quantum optical network exhibits a fidelity higher than 0.978.

    • Jin-Shi Xu
    • Man-Hong Yung
    • Guang-Can Guo
    Letter
  • Terahertz waveforms with peak fields of 72 MV cm−1 and a central frequency of 30 THz drive interband polarization in bulk GaSe off-resonantly and accelerate excited electron–hole pairs, inducing dynamical Bloch oscillations. This results in the emission of phase-stable, high-harmonic transients over the whole frequency range of 0.1–675 THz.

    • O. Schubert
    • M. Hohenleutner
    • R. Huber
    Letter
  • A means for localizing fluorescent molecules over distances of hundreds of nanometres exploits the energy transfer between a donor molecule and surface plasmons on a metal film. The technique is demonstrated by using it to profile the membranes of living cells.

    • Alexey I. Chizhik
    • Jan Rother
    • Jörg Enderlein
    Letter
  • Highly efficient perovskite solar cells have been fabricated by using room-temperature deposition processes. The cells are based on a layer of methylammonium lead iodide perovskite that is prepared by sublimation in a high-vacuum chamber and sandwiched between two thin organic charge-transport layers.

    • Olga Malinkiewicz
    • Aswani Yella
    • Henk J. Bolink
    Letter
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Article

  • Little is known about triplet excitons in semiconducting single-walled nanotubes, despite their importance in various applications. The pump–probe and spin-sensitive photoluminescence of such nanotubes is studied, and the quantum yield of triplet formation, triplet lifetime and triplet exciton size are found to be 5 ± 2%, 30 ± 10 µs and 0.65 nm, respectively.

    • Dominik Stich
    • Florian Späth
    • Tobias Hertel
    Article
  • Temporal dissipative solitons are observed in a nonlinear, high-finesse, optical microresonator driven by a continuous-wave laser. This approach enables ultrashort pulses to be generated in spectral regimes lacking broadband laser gain media and saturable absorbers, making it potentially useful for applications in broadband spectroscopy, telecommunications, astronomy and low-phase-noise microwave generation.

    • T. Herr
    • V. Brasch
    • T. J. Kippenberg
    Article
  • A dual-wavelength fibre laser source has been developed for stimulated Raman scattering microscopy. It is precisely tunable over the entire high-wavenumber region of Raman spectra, where most stimulated Raman scattering imaging is performed. Imaging speeds of up to 1 frame s−1 with shot-noise-limited sensitivity were achieved.

    • Christian W. Freudiger
    • Wenlong Yang
    • Khanh Q. Kieu
    Article
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Interview

  • On-chip quantum interference between integrated photon sources has now become a reality. Mark Thompson spoke to Nature Photonics about the realization of and future outlook for integrated quantum optics.

    • David Pile
    Interview
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