Mathieu, Juan

Date:   Thursday, March 26, 2020
Time:   13:30
Place:   ETH Zurich, Hönggerberg, HPZ E 35
Host:    Lukas Novotny

Quantum optics experiments in the micro-wave regime

Juan Mathieu
Institute for Quantum Optics and Quantum Information, Austria

In recent years, superconducting circuits have become a very promising quantum system as they offer a very high degree of controllability along with long coherence time. Moreover, owing to their macroscopic nature, they also provide large interaction strengths. As a result, they are very well suited to study and simulate effects typical from quantum optics that have remained challenging to realize with conventional AMO systems. In particular, as the coupling between qubits and to their environment can be precisely controlled, this approach is promising to simulate open quantum systems. In this talk, I will present our recent experimental efforts on the study of collective effects where the interaction is mediated via direct qubit-qubit coupling, allowing us to realize a Dicke molecule. Furthermore, by using a quantum limited amplifier, I will show how we could measure the photon emission from qubits with time and frequency resolved spectroscopy. Remarkably, such photon portraits agree perfectly with the predictions from the Wigner-Weisskopf theory for spontaneous emission, exemplifying the well-known energy-time Heisenberg uncertainty relation. Our work promises a new experimental analysis method in analog quantum simulation of open quantum systems and collective phenomena.