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

Relaxation of a two-level system (TLS) into a resonant infinite-temperaturereservoir with a Lorentzian spectrum is studied. The reservoir is described bya complex Gaussian-Markovian field coupled to the nondiagonal elements of theTLS Hamiltonian. The theory can be relevant for electromagnetic interactions inmicrowave high-$Q$ cavities and muon spin depolarization. Analytical resultsare obtained for the strong-coupling regime, $\Omega_0\gg\nu$, where $\Omega_0$is the rms coupling amplitude (Rabi frequency) and $\nu$ is the width of thereservoir spectrum. In this regime, the population difference and half of theinitial coherence decay with two characteristic rates: the most part of thedecay occurs at $t\sim\Omega_0^{-1}$, the relaxation being reversible for$t\ll(\Omega_0^2\nu)^{-1/3}$, whereas for $t\gg(\Omega_0^2\nu)^{-1/3}$ therelaxation becomes irreversible and is practically over. The other half of thecoherence decays with the rate on the order of $\nu$, which may be slower byorders of magnitude than the time scale of the population relaxation. The abovefeatures are explained by the fact that at $t\ll\nu^{-1}$ the reservoirtemporal fluctuations are effectively one-dimensional (adiabatic). Moreover, weidentify the pointer basis, in which the reduction of the state vector occurs.The pointer states are correlated with the reservoir, being dependent on thereservoir phase.Comment: 12 pages, 3 figures, to be published in Phys. Rev.

Relaxation of a two-level system strongly coupled to a reservoir: Anomalously slow decoherence