Late Paleoproterozoic sedimentary rock-hosted stratiform copper deposits in South China: their possible link to the supercontinent cycle

published_or_final_versio

Transformation Optics Approach to Plasmon-Exciton Strong Coupling in Nanocavities

We investigate the conditions yielding plasmon-exciton strong coupling at the single emitter level in the gap between two metal nanoparticles. A quasi-analytical transformation optics approach is developed that makes possible a thorough exploration of this hybrid system incorporating the full richness of its plasmonic spectrum. This allows us to reveal that by placing the emitter away from the cavity center, its coupling to multipolar dark modes of both even and odd parity increases remarkably. This way, reversible dynamics in the population of the quantum emitter takes place in feasible implementations of this archetypal nanocavity.Comment: 5 pages, 4 figure

Continuous weak measurement and feedback control of a solid-state charge qubit: physical unravelling of non-Lindblad master equation

Conventional quantum trajectory theory developed in quantum optics is largely based on the physical unravelling of Lindbald-type master equation, which constitutes the theoretical basis of continuous quantum measurement and feedback control. In this work, in the context of continuous quantum measurement and feedback control of a solid-state charge qubit, we present a physical unravelling scheme of non-Lindblad type master equation. Self-consistency and numerical efficiency are well demonstrated. In particular, the control effect is manifested in the detector noise spectrum, and the effect of measurement voltage is discussed.Comment: 8 pages, 5 figure

Quantum coherence and entanglement induced by the continuum between distant localized states

It is demonstrated that two distant quantum wells separated by a reservoir with a continuous spectrum can possess bound eigenstates embedded in the continuum. These represent a linear superposition of quantum states localized in the wells. We show that such a state can be isolated in the course of free evolution from any initial state by a null-result measurement in the reservoir. The latter might not be necessary in the many-body case. The resulting superposition is regulated by ratio of couplings between the wells and the reservoir. In particular, one can lock the system in one of the wells by enhancing this ratio. By tuning parameters of the quantum wells, many-body entangled states in distant wells can be produced through interactions and statistics.Comment: small modifications, one reference is added, to appear in Phys. Rev.

Paid Paternity Leave-taking in the United States

Surprisingly few studies have focused on paternity leave-taking in the United States. This study utilizes data from three national datasets to provide a comprehensive examination of the attitudes, practices, and predictors of paid paternity leave-taking in the US. Specifically, this study focuses on (a) describing attitudes toward fathers receiving a share of paid parental leave, (b) describing rates and lengths of paid paternity leave-taking, and (c) analyzing the extent to which economic capital, cultural capital, social capital, and father identities predict paternity leave-taking practices. The results indicate that most people support fathers receiving a share of paid parental leave in the US. Yet, rates of paid paternity leave-taking are relatively low, and the majority of fathers who take paid leave take only one week or less. Economic capital, cultural capital, social capital, and father identities that prioritize engaged fathering are positively associated with taking paid leave and taking longer periods of leave. Overall, the results emphasize that the current structure of US paternity leave policies seems to limit access to paid paternity leave and contribute to patterns of inequality because of more advantaged fathers having greater access and ability to take paid paternity leave than less advantaged fathers. Asombrosamente, pocos estudios se han enfocado en la solicitud de las licencias de paternidad, en caso de nacimiento o adopción, en los EE. UU. Este estudio utiliza información de tres conjuntos de datos estadísticos nacionales para proporcionar un análisis completo de las actitudes, prácticas y predictores de las licencias de paternidad remuneradas en los EE. UU. Específicamente, este estudio se centra en a) la descripción de las actitudes hacia los padres que reciben la licencia de paternidad remunerada, (b) la descripción de las diferentes tasas de pago y duraciones de la licencia de paternidad remunerada, y (c) el análisis del punto hasta donde el capital económico, el capital cultural, el capital social y las identidades paternas predicen prácticas de licencia de paternidad. Los resultados indican que la mayor parte de las personas encuestadas apoyan a los padres (los papas) que toman una licencia de paternidad remunerada en los EE. UU. Sin embargo, las tasas de pago de las licencias de paternidad remuneradas son relativamente bajas y la mayoría de los padres que toman la licencia de paternidad remunerada, la toman solo por una semana o menos. El capital económico, el capital cultural, el capital social, y las identidades paternas que dan prioridad a la participación paterna en el cuidado de los hijos y los quehaceres domésticos durante el periodo de la licencia de paternidad remunerada, están asociados positivamente con que los padres tomen permisos pagados y otros tipos de ausencias laborales más prolongadas. En general, los resultados enfatizan que la actual estructura de las normas y políticas referentes las ausencias laborales remuneradas en los EE. UU., parecen limitar el acceso a la licencia de paternidad remunerada y contribuyen a patrones de desigualdad debido a que los padres más favorecidos disponen de mayor acceso y más habilidad para tomar la licencia de paternidad remunerada que los padres menos favorecidos