Aleksander Wennersteen

Aleksander Wennersteen

Quantum, ML, HPC, Software

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Pages

Interests outside of technology

Aleksander enjoys art, especially painting. While he finds post-modernism intriguing impressionism and related styles are his favourite. Aleksander used to want to be an archaeologist and still is very interested in history. Read more

Posts

Recreating Gandalf by Lakera

6 minute read

Published:

Recently I discovered Lakera’s Gandalf game. I’ve written a Post about it even! Gandalf was designed to help users learn about LLM threats such as prompt injections and hallucinations. Having had lots of fun playing the game and thinking about how their defenses are built up, and I thought I would try to recreate it using only the base model. Read more

Architecting new projects

4 minute read

Published:

Recently I’ve helped a few colleagues start greenfield projects for the first time. I’ve noticed repeatedly that this is a difficult task for many, and sometimes academics moving into industry feel a bit overwhelmed about trying to write nice code that is up tho our standards. In this post I want to try to shed some light on how this truly is a iterative process. Especially when what you’re making is new and we don’t really know how to tackle it. Read more

IEEE QCE impression

3 minute read

Published:

Some thoughts I was left with after this years IEEE quantum week, with extra focus on the numerical simulation and software architecture workshops. Read more

ISC-HPC impression

3 minute read

Published:

ISC-HPC, “The Event for High Performance Computing, Machine Learning, Data Analytics & Quantum Computing” is a yearly conference focused on HPC but also more and more on the adjacent topics above. Read more

publications

Qadence a differentiable interface for digital and analog programs

Published in IEEE Software, 2025

In this work we present Qadence, a high-level programming interface for building complex digital and analog quantum programs. Digital-analog quantum computing (DAQC) is an alternative paradigm for universal quantum computation combining digital gates with global analog operations acting on a register of interacting qubits. Currently, no available open-source software is tailored to express, differentiate, and execute programs within the DAQC paradigm. Qadence addresses this shortfall by seamlessly allowing the user to combine digital and analog primitives. With a flexible interface and focus on native differentiability, Qadence aims to support research in variational algorithms in these hybrid computational models. Read more

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talks

Pulse level simulation of neutral atom QPUs

Published:

I presented on behalf of Pasqals emulation team our work on tensor network simulations of pulse level programming of neutral atom QPUs as well as our work on differentiable simulators for digital-analog algorithms. The work presented centred around our whitepaper for the cloud-based tensor network emulator (EMU-TN)[https://arxiv.org/abs/2302.05253] and the emulators built for the then not yet released (Qadence)[https://github.com/pasqal-io/qadence] digital-analog quantum programming interface. Read more

Qadence @ POPL24

Published:

The Fourth International Workshop on Programming Languages for Quantum Computing (PLanQC 2024) at the 51st ACM SIGPLAN Symposium on Principles of Programming Languages (POPL 2024). Read more

Supercomputing SC24

Published:

Supercomputing 2024 took place 17th - 22nd of November 2024 in Atlanta.. With a record of over 18 000 attendees and almost 500 exhibitors it’s the highlight of the HPC calendar. Read more

Software at the intersection of Quantum and HPC & heterogeneous quantum computing

Published:

At this years ISC I gave two talks, and also a “meet the experts” session at the booth of the Julich Supercomputing Center. IBM Quantum had a workshop where themselves and partners gave updates on the the state of quantum-centric supercomputing (QCSC). I gave a talk on “Software for heterogeneous quantum computing”, presenting our joint work on creating a joint software-stack for QCSC. Primarily the work on resource management, the associated code for spank plugins for quantum resources and jobs, and our Qiskit integration. Read more

Towards quantum-classical supercomputing with neutral atoms

Published:

I had the pleasure of attending the 32nd edition of the invite-only “International Advanced Research Workshop on High Performance Computing” held, as always, in Cetraro (Italy), June 23 – 27, 2025 to present our strategy towards quantum supercomputing at Pasqal. Read more

Material Science Working Group Meeting

Published:

Attended the yearly all-hands of the “Quantum-centric Supercomputing for Materials Science” working group organized by IBM and held at the R-CCS in Kobe. We had 2 days of talks and discussions focused on quantum-HPC integration and applications in materials science, chemistry and condensed matter. Read more