Raw and post-processed data, along with scripts to generate all the figures in the main and supplemental text for paper titled "A driven quantum superconducting circuit with multiple tunable degeneracies" (preprint: arXiv:2211.04605)
This data repository contains the information necessary to reproduce the main results of the paper “Exponential quantum advantage for learning signals with a single qubit”. The repository contains both the data required to generate the figures of the main manuscript and the supplemental material, as well as source code for running the experiments and simulations presented in the paper. There are two main folders: experiment_code (which contains all experimental scripts to calibrate device and run the protocols presented in the paper) and simulation_code (which contains simulation details of the dark matter and communication detection tasks) The data folder contains experimental raw and processed data generated. The figures folder contains all the plots presented in the manuscript.
We present the experimental discovery of multiple simultaneous degeneracies in the spectrum of a Kerr oscillator subjected to a squeezing drive. This squeezing, in combination with the Kerr interaction creates an effective static two-well potential in the frame rotating at half the frequency of the sinusoidal driving force. Remarkably, these degeneracies can be turned on-and-off on demand, and their number is tunable. We find that when the detuning Δ between the frequency of the oscillator and characteristic frequency of the drive equals an even multiple of the Kerr coefficient K, Δ/K=2m, the oscillator displays m+1 exact, parity-protected, spectral degeneracies, insensitive to the drive amplitude. The degeneracies stem from the unusual destructive interference of tunnel paths in the classically forbidden region of the double well static effective potential that models our experiment. Exploiting this interference, we measure a peaked enhancement of the incoherent well-switching lifetime creating a super-protected cat qubit in the ground state manifold of our oscillator. {Our results demonstrate the relationship between degeneracies and noise protection in quantum systems.