Denis JANKOVIC

Denis JANKOVIC

PhD student in co-supervision, Ultrafast Optics and Nanophotonics (DON)denis.jankovic@ipcms.unistra.fr
Tél: /Bureau: 2206

Current Research

Study of the Hyperfine Interactions in Lanthanide-Organic Complexes for Quantum Information Processing

Poster

Qudits vs. qubits : Conditions on Gate Efficiency

One of the big challenges in the field of quantum computing is to increase computing capacity by increasing the number of qubits. Scientists are therefore exploring an alternative called qudits, which are similar to qubits but with more than two available levels. However, due to these additional levels, they may have more paths vulnerable to errors. The objective of the study is therefore to investigate whether qudits are still competitive with qubits for handling errors arising from the environment. The study showed that qudits can be a promising option for quantum information processing in the future, especially if associated with specialized error correction methods.

Article
Poster

University Background

2020 – current : PhD Student | IPCMS | Department of Ultrafast Optics and Nanophotonics | QDYNO Group
Supervisor : Paul-Antoine Hervieux
Cotutelle : Mario Ruben, KIT, Karlsruhe, Germany

2019 : M1 Internship | Faculty of Physics – University of Basel | Condensed Matter Theory & Quantum Computing Group | Supervisors : Prof. Dr. Daniel Loss – Dr. Marko Rancic

Curriculum Vitae

Links

Academic Background

2018 – 2020 : MSc Condensed Matter and Nanophysics | University of Strasbourg

2016 – 2018 : BSc in Physics | University of Strasbourg

2016 – 2017 : Two-years degree Mathematics & Physics | University of Strasbourg

2015-2016 : Prep Classes for Engineering Schools : Physics & Chemistry| Lycée Kléber, Strasbourg

2015 : High School Diploma | Lycée Jean Mermoz, Saint-Louis

Publications

  • Quantum Optimal Control Using MAGICARP: Combining Pontryagin's Maximum Principle and Gradient Ascent
    by Denis Janković, Jean-Gabriel Hartmann, Paul-Louis Etienney, Killian Lutz, Yannick Privat, Paul-Antoine Hervieux
    We introduce the MAGICARP algorithm, a numerical optimization method for quantum optimal control problems that combines the structure provided by Pontryagin's Maximum Principle (PMP) and the robustness of gradient ascent techniques, such as GRAPE. MAGICARP is formulated as a "shooting technique", aiming to determine the appropriate initial adjoint momentum to […]
  • Elucidating the Physical and Mathematical Properties of the Prouhet-Thue-Morse Sequence in Quantum Computing
    by Denis Janković, Rémi Pasquier, Jean-Gabriel Hartmann, Paul-Antoine Hervieux
    This study explores the applications of the Prouhet-Thue-Morse (PTM) sequence in quantum computing, highlighting its mathematical elegance and practical relevance. We demonstrate the critical role of the PTM sequence in quantum error correction, in noise-resistant quantum memories, and in providing insights into quantum chaos. Notably, we demonstrate how the PTM […]
  • Full- and low-rank exponential Euler integrators for the Lindblad equation
    by Hao Chen, Alfio Borzì, Denis Janković, Jean-Gabriel Hartmann, Paul-Antoine Hervieux
    The Lindblad equation is a widely used quantum master equation to model the dynamical evolution of open quantum systems whose states are described by density matrices. These solution matrices are characterized by semi-positiveness and trace preserving properties, which must be guaranteed in any physically meaningful numerical simulation. In this paper, […]
  • Nonlinearity of the Fidelity in Open Qudit Systems: Gate and Noise Dependence in High-dimensional Quantum Computing
    by Jean-Gabriel Hartmann, Denis Janković, Rémi Pasquier, Mario Ruben, Paul-Antoine Hervieux
    High-dimensional quantum computing has generated significant interest due to its potential to address scalability and error correction challenges faced by traditional qubit-based systems. This paper investigates the Average Gate Fidelity (AGF) of single qudit systems under Markovian noise in the Lindblad formalism, extending previous work by developing a comprehensive theoretical […]
  • Noisy Qudit vs Multiple Qubits : Conditions on Gate Efficiency for Enhancing Fidelity
    by Denis Janković, Jean-Gabriel Hartmann, Mario Ruben, Paul-Antoine Hervieux
    Today, multiple new platforms are implementing qudits, $d$-level quantum bases of information, for Quantum Information Processing (QIP). It is therefore crucial to study their efficiencies for QIP compared to more traditional qubit platforms. We present a comparative study of the infidelity scalings of a qudit and $n$-qubit systems, both with […]