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  • 1.
    Brodu, Annalisa
    et al.
    Univ Utrecht, Debye Inst Nanomat Sci, NL-3584 CC Utrecht, Netherlands..
    Ballottin, Mariana V.
    Radboud Univ Nijmegen, High Field Magnet Lab, HFML EMFL, NL-6525 ED Nijmegen, Netherlands..
    Buhot, Jonathan
    Radboud Univ Nijmegen, High Field Magnet Lab, HFML EMFL, NL-6525 ED Nijmegen, Netherlands..
    van Harten, Elleke J.
    Univ Utrecht, Debye Inst Nanomat Sci, NL-3584 CC Utrecht, Netherlands..
    Dupont, Dorian
    Univ Ghent, Phys & Chem Nanostruct, B-9000 Ghent, Belgium..
    La Porta, Andrea
    Univ Antwerp, EMAT, Electron Microscopy Mat Res, B-2020 Antwerp, Belgium..
    Prins, P. Tim
    Univ Utrecht, Debye Inst Nanomat Sci, NL-3584 CC Utrecht, Netherlands..
    Tessier, Mickael D.
    Univ Ghent, Phys & Chem Nanostruct, B-9000 Ghent, Belgium..
    Versteegh, Marijn A. M.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Zwiller, Val
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Bals, Sara
    Univ Antwerp, EMAT, Electron Microscopy Mat Res, B-2020 Antwerp, Belgium..
    Hens, Zeger
    Univ Ghent, Phys & Chem Nanostruct, B-9000 Ghent, Belgium..
    Rabouw, Freddy T.
    Univ Utrecht, Debye Inst Nanomat Sci, NL-3584 CC Utrecht, Netherlands..
    Christianen, Peter C. M.
    Radboud Univ Nijmegen, High Field Magnet Lab, HFML EMFL, NL-6525 ED Nijmegen, Netherlands..
    Donega, Celso de Mello
    Univ Utrecht, Debye Inst Nanomat Sci, NL-3584 CC Utrecht, Netherlands..
    Vanmaekelbergh, Daniel
    Univ Utrecht, Debye Inst Nanomat Sci, NL-3584 CC Utrecht, Netherlands..
    Exciton Fine Structure and Lattice Dynamics in InP/ZnSe Core/Shell Quantum Dots2018In: ACS Photonics, E-ISSN 2330-4022, Vol. 5, no 8, p. 3353-3362Article in journal (Refereed)
    Abstract [en]

    Nanocrystalline InP quantum dots (QDs) hold promise for heavy-metal-free optoelectronic applications due to their bright and size tunable emission in the visible range. Photochemical stability and high photoluminescence (PL) quantum yield are obtained by a diversity of epitaxial shells around the InP core. To understand and optimize the emission line shapes, the exciton fine structure of InP core/shell QD systems needs be investigated. Here, we study the exciton fine structure of InP/ZnSe core/shell QDs with core diameters ranging from 2.9 to 3.6 nm (PL peak from 2.3 to 1.95 eV at 4 K). PL decay measurements as a function of temperature in the 10 mK to 300 K range show that the lowest exciton fine structure state is a dark state, from which radiative recombination is assisted by coupling to confined acoustic phonons with energies ranging from 4 to 7 meV, depending on the core diameter. Circularly polarized fluorescence line-narrowing (FLN) spectroscopy at 4 K under high magnetic fields (up to 30 T) demonstrates that radiative recombination from the dark F = +/- 2 state involves acoustic and optical phonons, from both the InP core and the ZnSe shell. Our data indicate that the highest intensity FLN peak is an acoustic phonon replica rather than a zero-phonon line, implying that the energy separation observed between the F = +/- 1 state and the highest intensity peak in the FLN spectra (6 to 16 meV, depending on the InP core size) is larger than the splitting between the dark and bright fine structure exciton states.

  • 2.
    Jöns, Klaus D.
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Schweickert, Lucas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Versteegh, Marijn A. M.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Dalacu, D.
    Poole, P. J.
    Gulinatti, A.
    Giudice, A.
    Zwiller, Val
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Reimer, M. E.
    Erratum to: Bright nanoscale source of deterministic entangled photon pairs violating Bell’s inequality (Scientific Reports, (2017), 7, 1, (1700), 10.1038/s41598-017-01509-6)2017In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, no 1, article id 7751Article in journal (Refereed)
  • 3.
    Jöns, Klaus D.
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Nano Photonics. Delft University of Technology, Netherlands.
    Schweickert, Lucas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Nano Photonics. Delft University of Technology, Netherlands.
    Versteegh, Marijn A. M.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Nano Photonics. Delft University of Technology, Netherlands.
    Dalacu, Dan
    Poole, Philip J.
    Gulinatti, Angelo
    Giudice, Andrea
    Zwiller, Val
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Nano Photonics. Delft University of Technology, Netherlands.
    Reimer, Michael E.
    Bright nanoscale source of deterministic entangled photon pairs violating Bell's inequality2017In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, no 1, article id 1700Article in journal (Refereed)
    Abstract [en]

    Global, secure quantum channels will require efficient distribution of entangled photons. Long distance, low-loss interconnects can only be realized using photons as quantum information carriers. However, a quantum light source combining both high qubit fidelity and on-demand bright emission has proven elusive. Here, we show a bright photonic nanostructure generating polarization-entangled photon pairs that strongly violates Bell's inequality. A highly symmetric InAsP quantum dot generating entangled photons is encapsulated in a tapered nanowire waveguide to ensure directional emission and efficient light extraction. We collect similar to 200 kHz entangled photon pairs at the first lens under 80 MHz pulsed excitation, which is a 20 times enhancement as compared to a bare quantum dot without a photonic nanostructure. The performed Bell test using the Clauser-Horne-Shimony-Holt inequality reveals a clear violation (S-CHSH > 2) by up to 9.3 standard deviations. By using a novel quasi-resonant excitation scheme at the wurtzite InP nanowire resonance to reduce multi-photon emission, the entanglement fidelity (F = 0.817 +/- 0.002) is further enhanced without temporal post-selection, allowing for the violation of Bell's inequality in the rectilinear-circular basis by 25 standard deviations. Our results on nanowire-based quantum light sources highlight their potential application in secure data communication utilizing measurement-device-independent quantum key distribution and quantum repeater protocols.

  • 4. Orieux, Adeline
    et al.
    Versteegh, Marijn A. M.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Nano Photonics.
    Jöns, Klaus D.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Nano Photonics.
    Ducci, Sara
    Semiconductor devices for entangled photon pair generation: a review2017In: Reports on progress in physics (Print), ISSN 0034-4885, E-ISSN 1361-6633, Vol. 80, no 7, article id 076001Article, review/survey (Refereed)
    Abstract [en]

    Entanglement is one of the most fascinating properties of quantum mechanical systems; when two particles are entangled the measurement of the properties of one of the two allows the properties of the other to be instantaneously known, whatever the distance separating them. In parallel with fundamental research on the foundations of quantum mechanics performed on complex experimental set-ups, we assist today with bourgeoning of quantum information technologies bound to exploit entanglement for a large variety of applications such as secure communications, metrology and computation. Among the different physical systems under investigation, those involving photonic components are likely to play a central role and in this context semiconductor materials exhibit a huge potential in terms of integration of several quantum components in miniature chips. In this article we review the recent progress in the development of semiconductor devices emitting entangled photons. We will present the physical processes allowing the generation of entanglement and the tools to characterize it; we will give an overview of major recent results of the last few years and highlight perspectives for future developments.

  • 5.
    Wengerowsky, Soeren
    et al.
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat Vienna, A-1090 Vienna, Austria.;Vienna Ctr Quantum Sci & Technol, A-1090 Vienna, Austria..
    Joshi, Siddarth Koduru
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat Vienna, A-1090 Vienna, Austria.;Vienna Ctr Quantum Sci & Technol, A-1090 Vienna, Austria.;HH Wills Phys Lab, Quantum Engn Technol Labs, Bristol BS8 1FD, Avon, England.;Univ Bristol, Dept Elect & Elect Engn, Bristol BS8 1UB, Avon, England..
    Steinlechner, Fabian
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat Vienna, A-1090 Vienna, Austria.;Vienna Ctr Quantum Sci & Technol, A-1090 Vienna, Austria.;Fraunhofer Inst Appl Opt & Precis Engn IOF Jena, D-07745 Jena, Germany.;Friedrich Schiller Univ Jena, Abbe Ctr Photon, D-07745 Jena, Germany..
    Zichi, Julien
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics. Single Quantum BV, NL-2628 CJ Delft, Netherlands..
    Dobrovolskiy, Sergiy M.
    Single Quantum BV, NL-2628 CJ Delft, Netherlands..
    van der Molen, Rene
    Single Quantum BV, NL-2628 CJ Delft, Netherlands..
    Los, Johannes W. N.
    Single Quantum BV, NL-2628 CJ Delft, Netherlands..
    Zwiller, Val
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics. Single Quantum BV, NL-2628 CJ Delft, Netherlands..
    Versteegh, Marijn A. M.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Mura, Alberto
    Ist Nazl Ric Metrol, I-10135 Turin, Italy..
    Calonico, Davide
    Ist Nazl Ric Metrol, I-10135 Turin, Italy..
    Inguscio, Massimo
    European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, Italy.;Univ Florence, Dept Phys & Astron, I-50019 Sesto Fiorentino, Italy.;CNR, I-00185 Rome, Italy..
    Huebel, Hannes
    Austrian Inst Technol, Ctr Digital Safety & Secur, A-1210 Vienna, Austria..
    Bo, Liu
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat Vienna, A-1090 Vienna, Austria.;Vienna Ctr Quantum Sci & Technol, A-1090 Vienna, Austria.;Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha 410073, Hunan, Peoples R China..
    Scheidl, Thomas
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat Vienna, A-1090 Vienna, Austria.;Univ Vienna, Quantum Opt Quantum Nanophys & Quantum Informat, A-1090 Vienna, Austria..
    Zeilinger, Anton
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat Vienna, A-1090 Vienna, Austria.;Univ Vienna, Quantum Opt Quantum Nanophys & Quantum Informat, A-1090 Vienna, Austria..
    Xuereb, Andre
    Univ Malta, Dept Phys, MSD-2080 Msida, Malta..
    Ursin, Rupert
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat Vienna, A-1090 Vienna, Austria.;Vienna Ctr Quantum Sci & Technol, A-1090 Vienna, Austria..
    Entanglement distribution over a 96-km-long submarine optical fiber2019In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 116, no 14, p. 6684-6688Article in journal (Refereed)
    Abstract [en]

    Quantum entanglement is one of the most extraordinary effects in quantum physics, with many applications in the emerging field of quantum information science. In particular, it provides the foundation for quantum key distribution (QKD), which promises a conceptual leap in information security. Entanglement-based QKD holds great promise for future applications owing to the possibility of device-independent security and the potential of establishing global-scale quantum repeater networks. While other approaches to QKD have already reached the level of maturity required for operation in absence of typical laboratory infrastructure, comparable field demonstrations of entanglement-based QKD have not been performed so far. Here, we report on the successful distribution of polarization-entangled photon pairs between Malta and Sicily over 96 km of submarine optical telecommunications fiber. We observe around 257 photon pairs per second, with a polarization visibility above 90%. Our results show that QKD based on polarization entanglement is now indeed viable in long-distance fiber links. This field demonstration marks the longest-distance distribution of entanglement in a deployed telecommunications network and demonstrates an international submarine quantum communication channel. This opens up myriad possibilities for future experiments and technological applications using existing infrastructure.

1 - 5 of 5
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