Theory of Open Systems

ERC Starting Grant: ToNQS - Theory of Noisy Quantum Simulation of Many-body Physics 

Led by Dr Rahul Trivedi

The project aims to establish a theoretical foundation for assessing the accuracy and performance of so-called “noisy” quantum simulators. These devices use controllable quantum systems to reproduce complex many-body phenomena – a promising pathway to explore questions beyond the reach of classical computers.

In quantum computing, noise refers to disruptive influences such as temperature fluctuations, electromagnetic fields, or minute inaccuracies in control. These effects can easily alter or destroy fragile quantum states. Since quantum systems can never be fully isolated from their environment, noise will always be present. Error correction could provide a solution, but it requires so many additional qubits and resources that fully error-corrected quantum computers until now remain a future vision.

Trivedi and his team therefore aim to develop mathematical tools that can certify the reliability of analog quantum simulators even under realistic, noisy conditions. Success would not only dispel long-standing doubts about such simulators, but also benefit fields such as condensed matter physics, quantum optics, high-energy physics, and complexity theory – long before fully fault tolerant quantum computers become a reality.

Trivedi’s research group currently consists of three PhD students, one Master’s student and several co-advised students in collaboration with other groups at MPQ. The group also maintains extensive collaborations with partners both within Europe and the US. With the ERC grant, several new positions for PhD students and postdoctoral researchers will become available. Interested candidates are invited to apply via  the MPQ theory application portal.

About Rahul Trivedi

Rahul Trivedi studied Electrical Engineering at the Indian Institute of Technology in Delhi and received his PhD from Stanford University in 2021. After a postdoctoral fellowship at the Max Planck Harvard Research Center for Quantum Optics, he became an Assistant Professor at the University of Washington. In 2024, he returned to MPQ as a tenured researcher, where he now leads a research group in the Theory Division. He has previously been awarded funding in the US by the National Science Foundation (NSF) and the Department of Energy (DOE) to conduct research in quantum information and quantum optics.