Quantum Computing Technologies Group

  • Quantum Computing Technologies Group

    Quantum Computation (QC) is arguably the most revolutionary of all new quantum technologies, as it may transform many industrial sectors with a direct impact on society. In the past five years, the field has experienced a huge transformation as it is being adopted and developed by industry after two decades being an almost purely academic endeavor.

    There exist today small-scale prototypes produced by both research groups and large corporations. Those devices are getting powerful enough to provide advantages over conventional computers in specific applications. However, in order to achieve the long-sought “quantum supremacy”, several key developments are still necessary.

    IFAE is fully engaged in this technology since 2019. The particular implementation developed at IFAE, quantum annealing, is one of the most promising avenues by which to achieve an advantage over conventional computers by solving optimization problems which are ubiquitous in society (delivery, traffic, chemistry, etc.).

    The QCT group develops superconducting circuits for applications in quantum computation. By employing Josephson-junction technology, the group engineers superconducting qubits for the implementetion of quantum algorithms. Part of the research is focused on improving the qubit quality by mitigation of environmental noise sources, while at the same time the circuits are used to investigate fundamental physics of quantum optics phenomena.

    QCT Lab
    Refrigerator at the IFAE QCT Lab Credit: IFAE QCT Group
    In 2020, the QCT group achieved the complete construction of its laboratory at the IFAE workshop. The new laboratory was already used to complete the first complete work performed at IFAE, the demonstration of a single qubit as a universal approximant. This new quantum algorithm was deviced by the group led by Prof. J. I. Latorre, currently the director of the Center for Quantum Technologies in Singapore, and was implemented using the single superconducting qubit device that was fabricated by the group of Prof. Martin Weides at the Karlsruhe Institute of Technology. The initial round of measurements had been performed at the Catalan Institute of Nanoscience and Nanotechnology (ICN2) in the lab of Prof. S. O. Valenzuela while the IFAE laboratory was being built. This quantum algorithm uses the qubit properties to approximate the value of any bounded mathematical function after a series of quantum gates applied to the qubit. The experimental demonstration showed full agreement with the simulated values. A preprint was produced in early 2021.
    QCT Lab
    QCT Lab Credit: IFAE QCT Group

    You can find more information on the QCT group at IFAE website

  • Group Members

    Quantum Computing Technologies Group

    Staff Researcher

    • Pol Forn-Díaz

      Pol Forn-Díaz

    • Manel Martinez

      Manel Martinez

    Project Manager

    • Sara Martínez

      Sara Martínez

    Postdoc Researcher

    • Elia Bertoldo

      Elia Bertoldo

    PhD Student

    • Luca Cozzolino

      Luca Cozzolino

    • David López

      David López

    • Boris Nedyalkov

      Boris Nedyalkov

    • Alba Toras

      Alba Toras

    • Fabian Zwiehoff

      Fabian Zwiehoff

  • Research Projects

    Quantum Computing Technologies Group



    Annealing-based VAriational QUantum processorS

    AVaQus is a European project funded in the FET-Open 2019 call to develop a quantum processor that demonstrates coherent quantum annealing and its potential to solve real-life optimization problems.



    Superinductor-based Quantum Technologies with Ultrastrong Couplings

    SiUCS focus on improving the efficiency of qubit operations involving light-matter interactions. In addition, superinductors are used to engineer a missing device of the superconducting quantum circuit toolbox: the microwave single photon detector.

  • Selected Publications

    Quantum Computing Technologies Group

    • Lee, Jin Hong et al.,
      The 2021 quantum materials roadmap,
      Journal Of Physics-Materials 3 (2021) [DOI]
    • Forn-Díaz P et al.,
      Startup Qilimanjaro—towards a European full-stack coherent quantum annealer platform,
      Epj Quantum Technology 8 (2021) [DOI]
    • Sabín C et al.,
      Observation of Three-Photon Spontaneous Parametric Down-Conversion in a Superconducting Parametric Cavity,
      Physical Review x 10 (2020) [DOI]
    • Etcheverry S et al.,
      Plug-and-play continuous-variable quantum key distribution for metropolitan networks,
      Optics Express 28 (2020) [DOI]
    • Lamata L et al.,
      Ultrastrong coupling regimes of light-matter interaction,
      Reviews Of Modern Physics 91 (2019) [DOI]
  • Group News


    New QCT publication

    May 5, 2021

    “Transmission spectra of the driven, dissipative Rabi model in the USC regime” by L. Magazzù, P. Forn-Díaz, M. Grifoni has been uploaded to arXiv


    Master's degree in Quantum Science and Technology

    April 8, 2021

    IFAE participates sin the new UB master’s degree in Quantum Science and Technology.


    Clustering & Global Challenges conference

    April 7, 2021

    The Barcelona-Grenoble-Tsukuba “Clustering and Global Challenges” (CGC2021) international online conference presented the most recent research advances and technology developments in different hot sectors such as Quantum Technologies, Advanced Materials, … Manel Martinez was part of the organizing committee. Pol Forn-Díaz gave a talk introuducing the AVaQus project.


    New Qilimanjaro Publication

    March 3, 2021

    Startup Qilimanjaro—towards a European full-stack coherent quantum annealer platform” has been published in EPJ Quantum Technology in a Special Issue on Quantum Industry.


    Qubit evaporator for the QCT lab

    February 27, 2021

    A Qubit evaporator is being installed in the QCT Lab. This system is necessary for in-house qubit development and production.


    New QCT group Publication

    February 20, 2021

    The 2021 quantum materials roadmap, Feliciano Giustino et al 2021 J. Phys. Mater. 3 042006, is a Review papers led by Stephan Roche (ICN2). Pol Forn contributed a chapter on Superconductor and semiconductor qubits.