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 introduce a first-order quantum-phase-transition model, which exhibitsgiant sensitivity $\chi \propto N^2$ at the critical point. Exploiting thiseffect, we propose a quantum critical detector (QCD) to amplify weak inputsignals. The time-dynamic QCD functions by triggering a first-order dynamicalquantum phase transition in a system of spins with long-range interactionscoupled to a bosonic mode. We numerically demonstrate features of the dynamicalquantum phase transition, which leads to a time-dependent quantum gain. We alsoshow the linear scaling with the spin number $N$ in both the quantum gain andthe corresponding signal-to-quantum noise ratio of this QCD. Our QCD can be aresource for metrology, weak signal amplification, and single photon detection.

Quantum Critical Detector : Amplifying Weak Signals Using First-Order Dynamical Quantum Phase Transitions