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 successfully demonstrate low-frequency noise suppression in the resonantfrequency fluctuations of a cavity-embedded Cooper pair transistor (cCPT)driven at single-photon occupancy. In particular, we report a reduction in theresonant frequency fluctuations caused by the internal charge noise over abandwidth of $\sim$1.4 kHz when the cavity is driven at an average photonnumber $n=10$, and a bandwidth of 11 Hz for average $n=1$. The gate-dependenttunability of the cCPT allows us to implement a feedback-scheme, derived fromthe Pound-Drever-Hall locking technique. This reduces fluctuations due tointrinsic charge-noise, which otherwise interferes with the cCPT's operation asa near quantum-limited electrometer. We believe our technique can begeneralized to achieve frequency stabilization in tunable microwave resonatorsthat play a vital role in today's quantum computing architecture, therebymoderating the limitations in detection caused by the intrinsic $1/f$-noise onsuch circuit devices. The work discusses the various aspects relating to theoperation of a fully functional feedback loop down to the single-photon level.

Feedback stabilization of the resonant frequency in tunable microwave cavities with single-photon occupancy