Frank Jensen

Professor

Aarhus University
Country flagDenmark

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Positions (1)

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Frank Jensen

University Name
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Aarhus University

Applications are invited for PhD positions in Quantum-Enhanced Computational Chemistry for Drug Discovery at Aarhus University, Denmark. These positions are part of the EarlyBirdd collaborative project involving Kvantify, Atom Computing, and the research groups of Professors Frank Jensen and Ove Christiansen at the Department of Chemistry. The research aims to develop advanced computational tools for drug design, integrating conventional methods with quantum computing methodologies. Possible research directions include: (1) development and implementation of high-accuracy ab-initio derived force fields for molecular systems, (2) development of Gaussian Process Regression methods to enhance potential energy surface accuracy and efficiency, and (3) methods for computing quantum free energies and entropic contributions to reactions using quantum statistical mechanics. The work is rooted in computational and quantum chemistry, with a focus on future quantum computational algorithms. Candidates should have a strong background in theoretical/computational chemistry, quantum chemistry, quantum physics, quantum computing, or closely related fields. Programming experience is highly desirable. Applicants must provide a motivation letter and prioritize their research interests among the three topics. The research environment is collaborative and supportive, with access to shared facilities and interaction with multiple PIs and students. The positions are funded PhD fellowships at the Graduate School of Natural Sciences, Aarhus University. The application deadline is 1 May 2026, with the online system opening on 1 March 2026. For more information, contact Professors Frank Jensen ([email protected]) or Ove Christiansen ([email protected]). Apply online by selecting the Chemistry programme and uploading the required documents as per the application guide.

5 months ago

Articles (19)

In this paper, we develop and analyze a number of perturbation series that target the coupled cluster singles and doubles (CCSD) ground state energy. We show how classical Møller–Plesset perturbation theory series can be restructured to target the CCSD energy based on a reference CCS calculation and how the corresponding cluster perturbation series differs from the classical Møller–Plesset perturbation series. Subsequently, we reformulate these series using the coupled cluster Lagrangian framework to obtain series, where fourth and fifth order energies are determined only using parameters through second order. To test the methods, we perform a series of test calculations on molecular photoswitches of both total energies and reaction energies. We find that the fifth order reaction energies are of CCSD quality and that they are of comparable accuracy to state-of-the-art approximations to the CCSD energy based on local pair natural orbitals. The advantage of the present approach over local correlation methods is the absence of user defined threshold parameters for neglecting or approximating contributions to the correlation energy. Fixed threshold parameters lead to discontinuous energy surfaces, although this effect is often small enough to be ignored, but the present approach has a differentiable energy that will facilitate derivation and implementation of gradients and higher derivatives. A further advantage is that the calculation of the perturbation correction is non-iterative and can, therefore, be calculated in parallel, leading to a short time-to-solution.

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Collaborators (9)

Luca Frediani

Førsteamanuensis (ass. prof.)

UiT Norges arktiske universitet

NORWAY
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Henrik Høj Kristensen

Aarhus University

DENMARK
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Tobias Weidner

Aarhus University

DENMARK
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Yosef Knattrup

Aarhus University

DENMARK
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Henrik Stapelfeldt

-

DENMARK
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Akitaka Matsuda

Lecturer

Nagoya University

JAPAN
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Poul Jørgensen

-

DENMARK
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Lars Bojer Madsen

Professor

Aarhus University

DENMARK
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Jonas Elm

Aarhus University

DENMARK
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