Shortcuts to Adiabaticity for Quantum Computation and Simulation

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Adiabatic processes are at the core of countless experiments. They find numerous applications in quantum simulations and quantum computing that range from adiabatic pulse sequences generating quantum gates in superconducting platforms to the preparation of many-body states in cold atoms, to name just a few. While the adiabatic theorem enables a variety of applications, it is also a source of fundamental limitations both in required timescales and restricting to ground/eigenstate conserving operations. This fundamental science project explores a novel concept as a seed for future technological implementations in adiabatic quantum simulation and computing. Its specific goal is to develop a comprehensive set of non-adiabatic building blocks that replace the adiabatic state preparation by non-adiabatic processes using shortcuts to adiabaticity (STA). This fundamentally new paradigm allows one to detach from the adiabatic limit, which currently hinders practical applications, by introducing additional unitary quantum operations to the system. In this promising approach, only early theory work and simplistic experiments exist so far. In a joint effort of leading European experimental and theory groups, the project will demonstrate (i) the first two-body STA experiment with a scalable architecture, (ii) the first STA experiment with a non-scale-invariant system, (iii) a novel theoretical framework for STA of statistical ensembles and (iv) a novel tensor network framework for STA. The subproject proposed in this application exploits the longstanding experience of WMI on the design, fabrication, and measurement of superconducting quantum circuits in order to implement aspect (i).