“Quantum Processors and Quantum Networks – Atom-by-Atom” (Prof. Hannes Bernien)

Date: May 13, 2025
Time: 02:30 PM (Local Time Germany)
Speaker: Prof. Hannes Bernien
University of Innsbruck & IQOQI, University of Chicago
Location: Max Planck Institute of Quantum Optics, Hans-Kopferman-Straße 1, 85748 Garching
Room: Herbert Walther Lecture Hall
Host: Max Planck Institute of Quantum Optics

Reconfigurable arrays of neutral atoms have emerged as a leading platform for quantum science. Their excellent coherence properties combined with programmable Rydberg interactions have led to intriguing observations such as quantum phase transitions, the discovery of quantum many-body scars, and novel quantum computing architectures.

Here, I will look forward to what is next for atom arrays. In particular, I am going to introduce a dual-species Rydberg array, that naturally lends itself for measurement-based protocols such as quantum error correction, long-range entangled state preparation, and measurement-altered many-body dynamics. The second atomic species is used as an auxiliary qubit to measure and control the primary species. In a first demonstration of this architecture, we use an array of cesium qubits to correct correlated phase errors on an array of rubidium data qubits [1]. Rydberg interactions between the two species then lead to novel regimes, including greatly enhanced resonant dipole interactions, that we use to demonstrate a two-qubit gate and quantum non-demolition readout [2].

Another crucially important step for atom arrays will be the scaling beyond a single processing module. I will describe how a modular quantum network architecture can look like and will present a node that combines large atom arrays with arrays of photonic interfaces at telecom wavelength [3].

[1] Singh, Bradley, Anand, Ramesh, White, Bernien, Science 380, 1265 (2023)
[2] Anand, Bradley, White, Ramesh, Singh, Bernien, Nature Physics (2024)
[3] Menon, Glachman, Pompili, Dibos, Bernien, Nature Comm. 15, 6156 (2024)