Campagne-Ibarcq, Philippe

Date:   Wednesday, December 18, 2019
Time:   11:00
Place:   ETH Zurich, Hönggerberg, HPF G 6
Host:    Jonathan Home

A fully stabilised logical quantum bit encoded in grid states of a superconducting cavity

Philippe Campagne-Ibarcq
Yale University, USA & INRIA Paris, France

Protecting quantum information requires encoding a qubit into a space with a large number of dimensions. To this end, one can use a single harmonic oscillator as an alternative to an ensemble of many two-level systems. In 2001, Gottesman Kitaev and Preskill (GKP) proposed to encode quantum information in non-local grid states of an oscillator. Remarkably, this code has the potential to protect quantum information against all known error channels.

In conjunction with stroboscopically modulated microwave drives , the dispersive interaction naturally arising between a microwave resonator and an ancillary superconducting qubit is sufficient to stabilize these exotic states. In this talk, I will review GKP code properties and present successful encoding and stabilization of a logical qubit in grid states of a microwave resonator.