In 1991, Zoller became Professor at the Physics Department of the University of Colorado, Boulder, and JILA Fellow. At the end of 1994, he accepted a chair at the University of Innsbruck, where he worked until 2024. From 1995 to 1999, he headed the Department of Theoretical Physics, from 2001 to 2004, he was vice-dean of studies. From 2003 to 2024, he was a Scientific Director at the Institute for Quantum Optics and Quantum Information (IQOQI) of the Austrian Academy of Sciences.[6]
As a theoretical physicist, Zoller has made significant contributions to atomic physics, many-body physics and quantum information science. In particular, his proposals on quantum computing with trapped ions, on quantum simulation with ultracold atoms in optical lattices and on quantum repeaters in quantum communication have made a decisive contribution to bringing theoretical concepts of quantum information into a laboratory setting. This has inspired and guided new experimental research directions and established quantum optical systems as one of the leading experimental platforms for quantum technologies.
In 1995, together with Ignacio Cirac, he proposed a “quantum computer with cold trapped ions”.[15] This was the first experimentally realistic and comprehensive proposal for a universal quantum computer. This work triggered a rapid experimental development in which numerous pioneering achievements such as the demonstration of quantum algorithms, digital quantum simulations, quantum error correction and quantum metrology were achieved. In 1999, Cirac and Zoller proposed a quantum computer based on cold atoms in optical lattices, in which two-qubit gates are executed by controlled collisions.[16] A year later, together with Mikhail Lukin and others, they presented an alternative way to implement these gates using Rydberg atoms.[17] With the ever-improving experimental control of neutral atoms in laser tweezers, this approach is becoming increasingly important.[18]
In 1998, Cirac and Zoller proposed the use of ultracold atoms in optical lattices as an analog quantum simulator for Hubbard models to investigate questions in solid-state physics.[19] This approach allows strongly interacting many-body systems to be probed in both equilibrium and non-equilibrium states, addressing key questions in the theory and design of correlated quantum materials and in regimes challenging for classical calculations.[20] The experimental development of this platform has led to a number of important advances, including the first observation of the transition between superfluidity and a Mott insulator,[21] the creation and study of topological quantum phases of matter with synthetic gauge fields, and the exploration of the 2D fermionic Hubbard model.
Also in 1998, a team led by Zoller presented the concept of quantum repeaters,[22] which overcame the problems associated with noise and the loss of photons in optical fibers and made quantum communication over long distances possible. Previously, they had discovered the possibility of entangling atoms by exchanging photons at a distance.[23] In 2001, they proposed a specific atomic setup to build such quantum repeaters.[24] These have become a crucial building block for the development and deployment of quantum communication.
Zoller's ideas and concepts attract widespread interest within the scientific community and his works are highly cited.[25][26]
For his achievements in the field of quantum optics and quantum information and especially for his pioneering work on quantum computers, quantum simulation and quantum communication he als received numerous prizes, these include:
The Quantum World of Ultra-Cold Atoms and Light Book I: Foundations of Quantum Optics, Imperial College Press, London and Singapore 2014. ISBN9781783264605
The Quantum World of Ultra-Cold Atoms and Light Book II: Physics of Quantum Optical Devices, Imperial College Press, London and Singapore 2015. ISBN9781783266166
The Quantum World of Ultra-Cold Atoms and Light Book III: Ultra-Cold Atoms, World Scientific, London and Singapore 2014. ISBN9781786344175
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