Doctoral Position in neutral-atom quantum computing

The newly established Atom Quantum Processing (AQP) group, led by Prof. Konrad Viebahn,at the Institute for Quantum Electronics within the Physics Department (D-PHYS), ETH Zurich, is seeking a highly motivated Doctoral Candidate.

Our research focusseson ultracold neutral atoms and their application in quantum technologies, in particular, quantum computing. We are currently establishing a new laboratory for laser cooling, trapping, and imaging ultracold rubidium atoms in optical lattices. With newly developedmethods, such as high-fidelity collisional atom-atom interactions, we build highly coherent quantum machines capable of creating massively entangled quantum states for computing, simulation, sensing, and metrology.

Neutral atoms are one of the most promising quantum architectures of today. Yet, the current roadmaps towards neutral-atom fault-tolerant quantum computers are almost exclusively based on Rydberg interactions in optical tweezers. While Rydberg-based gates are fast, they have a massive drawback: finite Rydberg lifetimes and unavoidable decoherence due to spontaneous emission. Instead, our research will employ collisional interactions between atomic qubits, which are highly coherent, passively stable, and very scalable.

By using optical lattices instead of optical tweezers we can trap and control more qubits per given laser power, eventually leading to a scalability advantage over the neutral-atom state-of-the‑art.

We have recently overcome an important bottleneck in optical‑lattice‑based quantum processors, by integrating topological pumping as a method to shuttle atoms between lattice sites (see publications). When combined with stable collisional gates, a new quantum architecture emerges with the ability to create massively entangled states, large‑scale quantum simulation, quantum sensingand, eventually, fault‑tolerant computing.

In this experimental Doctoral project, you will play a central role in setting up the experimental apparatus, building a closely‑knit team, and developing new concepts in collisional quantum processing.

• Building up the AQP team in a collaborative, enthusiastic, and communicative environment
• Setting up laser system for laser cooling, trapping, and imaging of rubidium‑85 atoms
• Engineering and assemblingUHV (ultra‑high vacuum) system with excellent optical access for the quantum processor
• Programming and integrating experimental control hardware (ARTIQ) for running quantum information experiments
• Investigating novel schemes for quantum information processing based on collisional interactions, including theoretical calculations and numerical simulations
• Preseting your results at scientific conferences and publishing your work

• You should hold (or be close to completing) an MSc degree in physics, quantum engineering, electrical engineering, or closely related discipline
• You should have a strong motivation to build a quantum computer from scratch
• Excellent spoken and written English
• Willingness to work in an international and diverse team

Experience in any of the following laboratory techniques would be advantageous:

• Fibre coupling
• Optical/fluorescence microscopy
• Doppler-free absorption spectroscopy
• Spatial light modulation
• Laser locking, optical resonators
• Optical interferometers
• Gaussian beam profiling
• CAD development
• Soldering
• PCB development
• FPGA development
• Digital signal processing (DSP)

We offer a stimulating doctoral project on quantum computing with state‑of‑the‑art neutral‑atom techniques. The successful candidate with join a collaborative and international research group and will receive training in experimental techniques for AMO and quantum optics. The project will provide opportunities for collaboration with specialists in quantum information science, theoretical and experimental, as well as participation in interactional conferences and the supervision of student research projects.

The position is based at the Department of Physics (D-PHYS) and ETH Zurich's Hönggerberg campus in Zurich, Switzerland. The student will have an entire AMO laboratory at their disposal, including multiple laser systems, UHV chamber, control…