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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We show that in the regime of ground-state cooling, simple expressions can bederived for the performance of resolved-sideband cooling --- an example ofcoherent feedback control --- and optimal linear measurement-based feedbackcooling for a harmonic oscillator. These results are valid to leading order inthe small parameters that define this regime. They provide insight into theorigins of the limitations of coherent and measurement-based feedback forlinear systems, and the relationship between them. These limitations are notfundamental bounds imposed by quantum mechanics, but are due to the fact thatboth cooling methods are restricted to use only a linear interaction with theresonator. We compare the performance of the two methods on an equal footing--- that is, for the same interaction strength --- and confirm that coherentfeedback is able to make much better use of the linear interaction thanmeasurement-based feedback. We find that this performance gap is caused not bythe back-action noise of the measurement but by the projection noise. We alsoobtain simple expressions for the maximal cooling that can be obtained by bothmethods in this regime, optimized over the interaction strength.

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Comparing resolved-sideband cooling and measurement-based feedback  cooling on an equal footing: analytical results in the regime of ground-state  cooling