Welcome to the quantum optics lab

We explore fundamental quantum physics with atoms, photons and phonons and harness it for applications in quantum technology. In our experiments we study many-particle entanglement in Bose-Einstein condensates, explore hybrid atom-optomechanical systems, and develop quantum memories and sensors with atomic vapour cells. Our research combines experiment with theory, employing techniques of atomic physics, quantum optics and optomechanics. A common goal of our activities is to investigate quantum physics in systems of increasing size and complexity.

News from the lab

The awardees Maryse Ernzer and Paolo Colciaghi

Maryse and Paolo Receive QCQT Excellence Awards

Congratulations to Maryse Ernzer and Paolo Colciaghi! Both of their 2022 research has been recognized with QCQT excellence awards.
Thomas Karg wins Swiss Nanotechnology PhD Award

Thomas Karg wins SPS Award

Each year, the Swiss Physical Society awards topical prizes for exceptional PhD thesis. We congratulate Thomas Karg on winning this year's Metrology award, sponsored by METAS, for his work on the strong coupling of a nanomechanical…
Single Photon Storage

Single-Photon Storage in a Ground-State Vapor Cell Quantum Memory

Storing single photons from solid state sources in hot atomic vapor has been a long standing challenge due to read-out noise produced by the atoms. With a storage scheme exploiting polarization selection rules we have succeded in storing…
Coherent Feedback Cooling

Coherent Feedback Cooling of a Nanomechanical Membrane with Atomic Spins

Coherent feedback stabilises a system towards a target state without the need of a measurement, thus avoiding the quantum backaction inherent to measurements. In our experiment, we employ optical coherent feedback to remotely cool a…
Thomas Karg wins Swiss Nanotechnology PhD Award

Thomas Karg wins Swiss Nanotechnology PhD Award

The Swiss Nanotechnology PhD Award is given by the Swiss Micro‐ and Nanotechnology Network for excellent scientific first‐author publications in the field of Nanotechnology and Nanoscience published by PhD students. Thomas Karg received the…
Light-mediated strong coupling

Light-mediated strong coupling between a mechanical oscillator and atomic spins one meter apart

Engineering strong Hamiltonian interactions between quantum systems is usually only possible over short distances. We demonstrate a new scheme for long-distance interactions mediated by light and use it for a range of experiments in hybrid…

Basel Quantum Metrology and Sensing Conference

The Basel Quantum Metrology and Sensing Conference (BQMS 2020) will highlight the state of the art and most recent advances in quantum sensing and quantum metrology with atomic and solid-state spin systems. It will gather key global players…

Matteo Fadel wins Prix Schläfli 2019

Congratulations to Matteo Fadel, who was awarded a Prix Schläfli of 2019 by the Swiss Academy of Science for an excellent dissertation in the natural sciences. The Prix Schläfli was first awarded in 1866. Since then 104 young talents in…

Congratulations to the winners of the Ehrenfest award

For their paper Bell Correlations in a Bose-Einstein Condensate, Roman Schmied, Jean-Daniel Bancal, Baptiste Allard, Matteo Fadel, Valerio Scarani, Philipp Treutlein and Nicolas Sangouard have won the Paul Ehrenfest best paper award for…

Review article on entanglement and quantum metrology with atomic ensembles

Have a look at our new review article on "Non-classical states of atomic ensembles: fundamentals and applications in quantum metrology", a joint work of L. Pezzè, A. Smerzi, M. K. Oberthaler, R. Schmied and P. Treutlein. Now published in…