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Showing 1–14 of 14 results
Advanced filters: Author: Alfred Forchel Clear advanced filters

  • Optoelectronic devices such as conventional semiconductor lasers are used to study the chaotic behaviour of nonlinear systems. Here chaos is observed for quantum-dot microlasers operating close to the quantum limit with potential for new directions in the study of chaos in quantum systems.

    • Ferdinand Albert
    • Caspar Hopfmann
    • Ido Kanter
    Research
    Nature Communications
    Volume: 2, P: 1-5

  • Future quantum communication technologies require entanglement between stationary and flying qubits, in systems that are inherently scalable. To this end, De Greveet al.present full state tomography of a qubit pair formed by entangling a quantum dot spin and a photon, with a fidelity of over 90%.

    • Kristiaan De Greve
    • Peter L. McMahon
    • Yoshihisa Yamamoto
    Research
    Nature Communications
    Volume: 4, P: 1-7

  • An ultrafast, all-optical spin echo technique is used to increase the decoherence time of a single quantum dot electron spin from nanoseconds to several microseconds. The ratio of decoherence time to gate time exceeds 105, suggesting strong promise for future photonic quantum information processors and repeater networks.

    • David Press
    • Kristiaan De Greve
    • Yoshihisa Yamamoto
    Research
    Nature Photonics
    Volume: 4, P: 367-370

  • Bound pairs consisting of a vortex and an antivortex are expected to dominate the low-temperature physics in a variety of two-dimensional systems. The observation of such bound pairs, however, remains elusive. A study now establishes non-equilibrium condensates of exciton-polaritons as a platform for exploring the physics of vortex–antivortex pairs.

    • Georgios Roumpos
    • Michael D. Fraser
    • Yoshihisa Yamamoto
    Research
    Nature Physics
    Volume: 7, P: 129-133

  • An electrically pumped polariton laser is constructed using a quantum well microcavity, and its polaritonic nature is demonstrated unambiguously by using a magnetic field to probe the part-light, part-matter character of the system.

    • Christian Schneider
    • Arash Rahimi-Iman
    • Sven Höfling
    Research
    Nature
    Volume: 497, P: 348-352

  • Similar to atoms in cold gases, exciton–polaritons in semiconductor microcavities can undergo Bose–Einstein condensation. Now, formation of a condensate in an excited orbital state has been observed in such a system, underlining the potential of exciton–polariton condensates to emulate condensed-matter physics.

    • Na Young Kim
    • Kenichiro Kusudo
    • Yoshihisa Yamamoto
    Research
    Nature Physics
    Volume: 7, P: 681-686

  • Polycrystalline substrates are a hindrance to the realization of high-definition plasmonic nanostructures. In this paper the authors chemically grow large and thin gold single crystals, and show that they can be coupled with top-down fabrication methods to produce high-quality nanostructures with good optical properties.

    • Jer-Shing Huang
    • Victor Callegari
    • Bert Hecht
    Research
    Nature Communications
    Volume: 1, P: 1-8

  • Photonic crystals can manipulate the flow of light, making them attractive materials for new types of optical components. The ability to tune the optical properties of a photonic crystal over femotosecond timescales adds to their technological appeal.

    • Alfred Forchel
    News & Views
    Nature Materials
    Volume: 2, P: 13-14

  • Electron spin in quantum dots are extensively studied as a qubit for quantum information processing. However, the coherence of electron spin is deleteriously influenced by nuclear spin. Quantum-dot holes are a potential alternative. Full control over hole-spin qubits is now achieved using picosecond lasers.

    • Kristiaan De Greve
    • Peter L. McMahon
    • Yoshihisa Yamamoto
    Research
    Nature Physics
    Volume: 7, P: 872-878

  • Entanglement of the spin of an electron in a semiconductor quantum dot with a single photon is reported, and verified by means of time-resolved frequency downconversion to a telecommunications wavelength; this process is an essential requirement for future quantum networks.

    • Kristiaan De Greve
    • Leo Yu
    • Yoshihisa Yamamoto
    Research
    Nature
    Volume: 491, P: 421-425