Ulm's Institute of Theoretical Physics

Martin presenting the groups work on quantum control for quantum sensing and nuclear spin hyperpolarisation at the QI2025 in Osaka. The colourful pictures in the background show the performance of our PulsePol sequence in parahydrogen induced polaridsation. #quantum #NMR #hyperpolarization

Making quantum collision models exact - Communications Physics Quantum collision models are pivotal for simulating open quantum systems, yet lack comprehensive error certification. The authors analytically derive Markovian and non-Markovian collision models from ...

Quantum collision models are central in quantum thermo, open systems and quantum simulations but they lack a comprehensive error certification. In our new paper, we elevate collision models to numerically exact methods and enhance their reliability #Quantum

doi.org/10.1038/s420...

Great annual meeting of QuantERA project ExTraQt quantera.eu/extraqt/ at the Center for Quantum BioScience www.uni-ulm.de/en/nawi/cent... in Ulm. The project explores the intersection of Quantum Information Theory and the Life Sciences. #Quantum @quantumbioorg.bsky.social

Gravity Research Foundation Gravity Research Foundation's essay competition winners for this year!

Our group members Trini, Luciano, Susana and Martin were awarded the “Honorable Mention Award” by the Gravity Research Foundation for their essay related to testing non-classical aspects of gravity via angular momentum entanglement 🍎 #Quantum #Gravity
www.gravityresearchfoundation.org/announcement

Electron-vibrational coupling is fundamental in biological electron transport but its signatures in ultrafast spectroscopy is hard to compute. Read journals.aps.org/prresearch/a... to learn how quantum computers can accelerate this task. #Quantum #QuantumBiology #Quantumcomputing

Last week we have been delighted to welcome part of the QTT team from Edinburgh ✨ After the inspiring discussions and exciting ideas, we are looking forward to the fruitful collaboration ahead! #Quantum

Quantum Cramer-Rao Precision Limit of Noisy Continuous Sensing Quantum sensors hold considerable promise for precision measurement, yet their capabilities are inherently constrained by environmental noise. A fundamental task in quantum sensing is determining the ...

A new work on quantum metrology. What started with a summer project gradually evolved to deliver a new technique to compute non-linear quantities such as Fisher-Information from bosonic fields leaving a noisy driven-dissipative quantum sensor. arxiv.org/abs/2504.12400 #Quantum

Correlations as a resource in molecular switches Photoisomerization, a photochemical process underlying many biological mechanisms, has been modeled recently within the quantum resource theory of thermodynamics. This approach has emerged as a promis...

Proud to announce our new work on the application of resource theories to the Life Sciences. Do molecular photoswitches profit from correlations? Read this labour of love which evolved over several years via a Bachelor and a Masters thesis. arxiv.org/abs/2504.12202

In today's seminar we had Trini presenting her latest ideas on the use of spin coherent states in noisy quantum metrology ⬆️✨ Is entanglement a powerful resource when dealing with more realistic scenarios? 🤔 #Quantum #Metrology #entanglement

Today, Felix gave us a nice review on resource theories of channels, superchannels and super-maps with a full description on how to characterize them in the case of coherence theory ✨ Applications coming up very soon... #Quantum #ResourceTheory #QuantumComputing

In today's seminar, Luciano explored the many existing proposals for defining a spin operator in the relativistic regime🏃‍♀️ Followed by a discussion about the theoretical and experimental implications of achieving a consistent definition✨ #Quantum #Relativity

Full Microscopic Simulations Uncover Persistent Quantum Effects in Primary Photosynthesis The presence of quantum effects in photosynthetic excitation energy transfer has been intensely debated over the past decade. Nonlinear spectroscopy cannot unambiguously distinguish coherent electroni...

New preprint is out on ArXiv ✨
In this work, we boost our numerically exact method and simulated electronic dynamics of pigment-protein complexes based on full microscopic models, showing picosecond-lived inter-excitonic coherences 🌱
#QuantumBiology #Photosynthesis

👉 arxiv.org/abs/2503.17282

Today we had our Dani Siciliano telling us about his journey in finding steady states imposing positivity on tensor networks✨ Is it possible to do so avoiding the complexity of transient dynamics? #Quantum #Metrology #Science

Today’s seminar reminded us how crucial mental & physical health are in academia. Creating a safe space to discuss challenges, share experiences, laugh and support each other makes all the difference. Let’s keep the conversation going! 💙 #AcademicLife #MentalHealthInAcademia

Marit presenting her work of the last months on the physics of levitated particles. Discussing finer points with the team. #Quantum #Interferometry

13C hyperpolarization with nitrogen-vacancy centers in micro- and nanodiamonds for sensitive magnetic resonance applications Nuclear hyperpolarization of 13C spins is performed at ambient conditions in micro- and nanodiamonds.

We are pleased that our paper on record levels of polarisation of nanodiamond powders at room temperature by Martin K&P's has appeared in Science Advances www.science.org/doi/10.1126/... together with our friends in the Institute of Quantum Optics #Quantum #NMR #NMRChat

At our institute's latest talk, we explored the intricate relationship between work, power, and efficiency in quantum engines 🔥 Selma told us how quantum thermodynamics could unlock near-optimal efficiency for mesoscopic engines & nanodevices #QuantumThermodynamics #QuantumTechnologies

Award time at Uni Ulm's Dies Academicus! Our Ilai Schwartz receives the Uni Ulm PhD Prize. Martin Plenio & Fedor Jelezko win the University-Industry Cooperation Prize for co-founding NVision with Ilai, recognising a decade of work towards developing NVision and it's tech to market! #Quantum

Operator-basis Matrix Product State formalism for optical circuits Tensor network formalisms have emerged as powerful tools for simulating quantum state evolution. While widely applied in the study of optical quantum circuits, such as Boson Sampling, existing tensor ...

New preprint is out ✨

In this work, we present an alternative tensor network framework to simulate optical circuits by leveraging their input-output relations, eliminating the computational costs of compression techniques in standard tensor networks. Check it out 👇
arxiv.org/abs/2502.01737

Unlocking Heisenberg Sensitivity with Sequential Weak Measurement Preparation T. B. Lantaño, Dayou Yang, K. M. R. Audenaert, S. F. Huelga, and M. B. Plenio, Quantum 9, 1590 (2025). We propose a state preparation protocol based on sequential measurements of a central spin couple...

Trini's first paper is out in print in Quantum no less quantum-journal.org/papers/q-202.... Learn how to achieve Heisenberg scaling sensitivity in a central spin model without state preparation - just measure the central spin repeatedly. #quantum #metrology

From left to right: Mor Schwartz (Head of Operations, NVision), Marcel Emmerich (MP Green Party), Michael Joukov (MdL Green Party), Franziska Brantner (MP and Co-leader National Green Party), Ilai Schwartz (CTO & Co-Founder NVision) and Martin B Plenio (Scientific Advisor & Co-Founder, NVision) standing around POLARIS, our hyperpolarisation technology that is now going to market.

Franziska Brantner, co-leader of the German Green Party, MP Marcel Emmerich and MdL Michael Joukov visit NVision hosted by our Martin, Ilai and Mor to learn about our hyperpolarisation technology, now in the market, the result of ten years of research and development. #NMR #NMRchat #Quantum

Today we had our Dario Cilluffo teaching us the physics of giant atoms ⚛️ In his recent work he showed a surprising connection between the chirality of the atom and the Markovianity of its dynamics ✨ A step towards control of quantum nanophotonic networks #Quantum #Optics

We're kicking off 2025 with a lot of energy ✨ It's been an incredible start with lots of meetings, esteemed guests, intense discussions, warm gatherings and good beer. Here's to another year of groundbreaking research and fostering connections! 🌍 #Quantum

✨ Hello, Bluesky! ✨
We’re thrilled to join this amazing platform and connect with the scientific community in new and exciting ways. Follow us here at @qubitulm for cutting-edge physics research, inspiring collaborations, and all the latest from our institute! #Quantum