English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present the experimental discovery of multiple simultaneous degeneraciesin the spectrum of a Kerr oscillator subjected to a squeezing drive. Thissqueezing, in combination with the Kerr interaction creates an effective statictwo-well potential in the frame rotating at half the frequency of thesinusoidal driving force. Remarkably, these degeneracies can be turnedon-and-off on demand, and their number is tunable. We find that when thedetuning $\Delta$ between the frequency of the oscillator and characteristicfrequency of the drive equals an even multiple of the Kerr coefficient $K$,$\Delta/K = 2m$, the oscillator displays $m + 1$ exact, parity-protected,spectral degeneracies, insensitive to the drive amplitude. The degeneraciesstem from the unusual destructive interference of tunnel paths in theclassically forbidden region of the double well static effective potential thatmodels our experiment. Exploiting this interference, we measure a peakedenhancement of the incoherent well-switching lifetime creating asuper-protected cat qubit in the ground state manifold of our oscillator. {Ourresults demonstrate the relationship between degeneracies and noise protectionin quantum systems.

A driven quantum superconducting circuit with multiple tunable degeneracies