Ivan Rojkov

PhD student in the Trapped Ion Quantum Information group. Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.

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I am currently enrolled in a PhD program at ETH Zürich, where I am conducting research under the guidance of Florentin Reiter and Jonathan Home in the theory team of the Trapped Ion Quantum Information group.

My research interests lie at the intersection of theoretical quantum optics and quantum information science, with a particular focus on fault-tolerant quantum information processing. I aim to understand how environmental factors influence these systems and to develop strategies for leveraging or mitigating the dissipation of quantum information (approaches commonly referred to as dissipation or reservoir engineering). Through our latest preprint, I got interested in the nonlinearities inherent in most couplings between quantum systems. Typically, these nonlinearities are circumvented by operating within specific regimes (e.g., Lamb-Dicke and transmon regimes), often under the assumption of weak interactions and low excitations. However, they are also key components for introducing quantum features, thus necessitating novel effective and intuitive strategies to tackle them. As an initial step in this direction, our work introduces a novel paradigm in reservoir engineering. Using nonlinearities, we reveal a more general theory regarding the dimension, shape, and error-correction properties of quantum state manifolds stabilized through reservoir engineering.

In my daily work, I address few-body problems related to quantum error correction, error characterization, and the implementation of quantum gates in spin and/or bosonic systems. I investigate both continuous (Lindbladian-based) and discrete (gate-based) frameworks to analyze the dynamics and efficiency of these quantum processes.

Links:      Email     Google Scholar     ORCID     GitHub     LinkedIn     @RojkovIvan

news

Sep, 2025 Happy to announce that the experimental work realizing the schemes proposed in our theory work is now in preprint! Great teamwork with Matteo Simoni on both the theory and experiment :tada:
Sep, 2025 Lorenzo Fioroni’s work has been published in Phys. Rev. Applied as an Editors’ Suggestion!
Jul, 2025 Happy and proud to share that I have successfully defended my PhD before a committee composed of Jonathan Home (advisor), Florentin Reiter (2nd advisor), Liang Jiang (examiner), Eugene Demler (chair), Wenchao Xu, Marina Krstic Marinkovic, and Diana P. L. Aude Craik (guest professors)! Many thanks to them for the interesting discussion and to everyone who attended the public part for their support :tada:
Jul, 2025 Check out our two new works with Elias Zapusek and Florentin Reiter, showing how dissipation enables the design of scalable algorithms and autonomous quantum error correction!
Jun, 2025 Happy to announce that my SNSF Postdoc.Mobility project has been accepted! :tada: Looking forward to work with Steve Girvin and Shruti Puri at Yale University :grin:
Mar, 2025 Our work on characterization of coherent errors in gate layers is now published in Physical Review Applied. It was realized with Noah Kaufmann, at that time Master’s student at ETH Zurich, now PhD student in Anders Sørensen’s group at University of Copenhagen.

selected publications

  1. Bias in Error-Corrected Quantum Sensing
    Ivan Rojkov ,  David Layden ,  Paola Cappellaro ,  Jonathan Home ,  and  Florentin Reiter
    Phys. Rev. Lett. 128, 140503 (2022)
  2. Generation of a Maximally Entangled State Using Collective Optical Pumping
    Maciej Malinowski ,  Chi Zhang ,  Vlad Negnevitsky ,  Ivan Rojkov ,  Florentin Reiter ,  T-L Nguyen ,  Martin Stadler ,  Daniel Kienzler ,  Karan K Mehta ,  and  Jonathan P Home
    Phys. Rev. Lett. 128, 080503 (2022)
  3. Two-Qubit Operations for Finite-Energy Gottesman-Kitaev-Preskill Encodings
    Ivan Rojkov ,  Paul Moser Röggla ,  Martin Wagener ,  Moritz Fontboté-Schmidt ,  Stephan Welte ,  Jonathan Home ,  and  Florentin Reiter
    Phys. Rev. Lett. 133, 100601 (2024)
  4. Stabilization of cat-state manifolds using nonlinear reservoir engineering
    Ivan Rojkov ,  Matteo Simoni ,  Elias Zapusek ,  Florentin Reiter ,  and  Jonathan Home
    arXiv:quant-ph/2407.18087 (2024)
  5. Scaling Quantum Algorithms via Dissipation: Avoiding Barren Plateaus
    Elias Zapusek ,  Ivan Rojkov ,  and  Florentin Reiter
    arXiv:quant-ph/2507.02043 (2025)
  6. Scalable dissipative quantum error correction for discrete-variable codes
    Ivan Rojkov ,  Elias Zapusek ,  and  Florentin Reiter
    arXiv:quant-ph/2507.12534 (2025)
  7. Non-linear cooling and control of a mechanical quantum harmonic oscillator
    Matteo Simoni ,  Ivan Rojkov ,  Matteo Mazzanti ,  Wojciech Adamczyk ,  Alexander Ferk ,  Pavel Hrmo ,  Shreyans Jain ,  Tobias Sägesser ,  Daniel Kienzler ,  and  Jonathan Home
    arXiv:quant-ph/2509.05734 (2025)