Pierre Rouchon

Observing quantum trajectories based on the fluorescence and dispersive measurement records of a superconducting qubit

2017

We show the interplay of the backaction of two incompatible weak measurements of a superconducting qubit, its fluorescence and the transmission of a coupled cavity. The associated quantum trajectories reveal Zeno and diffusive dynamics.

Monitoring the energy of a cavity by observing the emission of a repeatedly excited qubit

2024 · arXiv (Cornell University)

The number of excitations in a large quantum system (harmonic oscillator or qudit) can be measured in a quantum nondemolition manner using a dispersively coupled qubit. It typically requires a series of qubit pulses that …