Preprints & Projects


  • Spectroscopy of entangled states of clusters of rare-earth impurity ions for quantum computing 01/2019-12/2023 (ETIS: PRG 347)
  • NeQst 09/2022-08/2026 (Explore ways to apply quantum computing to combinatorial optimization problems. Funded by Norges Forskningsråd. ETIS: MLTAT22410)
  • OpenSuperԚPlus 03/2023-09/2026 (EU endeavor to build a full-stack quantum computer based on superconducting electronic circuits, with the capability, by 2026, to achieve entanglement of 100+ qubits. UTartu will contribute to the enabling-software stack. Eestikeelne pressiteade)
  • NordiQuEst 04/2022-03/2025 (Makes available quantum computing resources, such as IQM/VTT-made 5-qubit quantum computing device “Helmi“, to HPC-users of LUMI and eX3. Funded by NeIC.)


Output of Quantum Computing research at the University of Tartu

This is updated very infrequently, sorry ☹️

“Proper” shift rules for derivatives of perturbed-parametric quantum evolutions
Dirk Oliver Theis
➜ Source code: Notebook with numerical simulations comparing to literature method
➜ Patent application US 17/856,357 arXiv:2112.14669
Optimality of finite-support parameter shift rules for derivatives of variational quantum circuits
Dirk Oliver Theis
➜ Source code: Proof-of-concept implementations arXiv:2103.13319
Fast qubits of optical frequencies on the rare-earth ions in fluoride crystals and color centers in diamond
Vladimir Hizhnyakov, Vadim Boltrushko, Aleksander Shelkan, Yurii Orlovskii arXiv:2101.07792 (Optics Communications)
Rare earth ions doped mixed crystals for fast quantum computers with optical frequency qubits
Vladimir Hizhnyakov, Vadim Boltrushko, Helle Kaasik, Yurii Orlovskii arXiv:1903.12611
Information content of queries in training parameterized quantum circuits
Bahman Ghandchi, Dirk Oliver Theis arXiv:1901.11434 (Frontiers in Physics)
Input redundancy for parameterized quantum circuits
Javier Gil Vidal, Dirk Oliver Theis arXiv:1812.06323
Calculus on parameterized quantum circuits
Javier Gil Vidal, Dirk Oliver Theis arXiv:1810.10759
Note on (active-)QRAM-style data access as a quantum circuit
Tore Vincent Carstens, Dirk Oliver Theis
Publications without preprint
Journal of Luminescence (2019)
Spectroscopic evidence of cooperative (entangled) quantum states of Nd3+ ion pairs in Nd3+: LaF3 crystal
Yurii Orlovskii, Helge Gross, Elena Vinogradova, Vadim Boltrushko, Vladimir Hizhnyakov