We simulate a zero-temperature pure Z3 Lattice Gauge Theory in 2+1 dimensions by using an iPEPS (Infinite Projected Entangled-Pair State) ansatz for the ground state. Our results are therefore directly valid in the thermodynamic limit. They clearly show two distinct phases separated by a phase transition. We introduce an update strategy that enables plaquette terms and Gauss-law constraints to be applied as sequences of two-body operators. This allows the use of the most up-to-date iPEPS algorithms. From the calculation of spatial Wilson loops we are able to prove the existence of a confined phase. We show that with relatively low computational cost it is possible to reproduce crucial features of gauge theories. We expect that the strategy allows the extension of iPEPS studies to more general LGTs.
The Spanish National Research Council – Consejo Superior de Investigaciones Científicas (CSIC) – presented the Medal for Scientific Excellence on the first day of its management meeting in Madrid. Ignacio Cirac, Director at the Max Planck Institute of Quantum Optics, is widely recognised as a leading figure in theoretical quantum optics, quantum information and degenerate quantum gases. He receives the honour in recognition of the “exceptional significance and international impact of his contributions”.
The Prix de l’Académie, the highest honour of the Royal Academy of Belgium, recognises outstanding scientific achievements. MPQ Director Ignacio Cirac and Peter Zoller receive the award for their pioneering contributions to quantum physics. Their theoretical work has deepened our understanding of the quantum world and driven experimental advances in computing, simulation, and quantum technologies.
Rahul Trivedi, tenured researcher in the Theory Division at MPQ, has been awarded an ERC Starting Grant of €1.5 million. His project ToNQS aims to develop new theoretical foundations to assess the reliability of quantum simulators operating under realistic noisy conditions. The research paves the way to exploring complex many-body phenomena – long before fully fault-tolerant quantum computers become a reality.
The theorist explored the potential of tensor networks as a tool for describing chiral gapped condensed matter systems. His work showed how methods from quantum field theory could extend the range of applicability of tensor network theory. His results effectively render tensor networks a more complete and powerful theory for condensed matter, allowing them to describe a wider variety of systems using exclusively analytical techniques.
