News

In our new pre-print, we introduce the first Quantum Convolutional Neural Network for 2D systems, in order to study the phase transition of the Toric Code. Our circuit robustly identifies the transition from the topological to the paramagnetic phase up to a certain incoherent noise strength.

In our new pre-print, we present the low-energy subspace cooling algorithm for finding the ground state of fermionic Hamiltonians. We derive adequate couplings between the system and an ancillary fridge without assuming prior knowledge about the spectrum and excitations of the system. Our algorithm ...

In our new pre-print, we study the entangling features of a unitary quantum operation using its operator-Schmidt, or tensor product decomposition. We present an algorithm for unbalanced partitions into a small subsystem and a large one (the environment) that computes the tensor product decomposition...

Combinatorial optimization problems are regarded as a promising use case for quantum computing. One such problem, which is of paramount relevance in industry, computation, and economics, is (flexible) job shop scheduling. It considers a set of jobs of varying processing times and seeks to schedule t...

Achieving fast and high-fidelity two-qubit entangling gates is crucial for future fault-tolerant error-correcting codes in scalable systems as well as for efficient implementation of quantum algorithms in current noisy devices. Our preprint (https://arxiv.org/abs/2312.16358) presents an advancement ...

We are happy to announce that our paper “Tunable coupler to fully decouple and maximally localize superconducting qubits” has been published in Physical Review Applied. In our paper, we derive conditions for tunable couplers to suppress all parasitic interactions, i.e. state delocalization and ZZ-cr...

The Theory of Quantum Technology Group at FAU Erlangen-Nürnberg, lead by professor Michael J. Hartmann invites applications for a postdoc position in quantum algorithms and quantum simulation.The positions will be part of the Bavarian and German programs to develop quantum computers, see e.g. https:...

We are glad to announce that our paper on "Problem Specific Classical Optimization of Hamiltonian Simulation" has been published in Physical Review Research. In our paper, we introduce a variational algorithm for Hamiltonian simulation. As quantum optimization faces fundamental problem when performe...

How can we compute or simulate the time evolution of quantum many-body systems on near-term quantum computers? This is currently one of the most pressing questions in the field. Prof. Michael J. Hartmann gave his inaugural talk on "Quantum Computing on Current Quantum Hardware” on the 5th of July di...

A major bottleneck of current NISQ hardware is low fidelity of 2 qubit gates. A component to improve this is the possibility to completely switch off interactions between qubits. In our pre-print we derive conditions for the coupler to suppress all parasitic interactions, i.e. state delocalization a...