Quantum coherence is an important feature that distinguishes quantum mechanics from classical physics. In this paper, we study the of a state with respect to channel, and introduce measure in terms generalized Wigner–Yanase–Dyson skew information. The basic properties operational significance are expounded detail, which shows it indeed veritable quantity satisfies many desirable conditions intuitively required for measures. We illustrate characterizing channels perspective through some...

Quantum coherence is one of the characteristic features quantum mechanics and underpins many mysteries. To eliminate influence reference basis on a state uncover its intrinsic properties, it common to study by averaging over different bases. Using metric-adjusted skew information, we explore three natural approaches average state: all orthonormal bases, elements an operator base, complete family mutually unbiased We establish equivalence among these types interpret unified as relative...

Abstract As an extension of classical probability distribution, the Kirkwood-Dirac distribution (KDD) was discussed by Kirkwood in 1933 and Dirac 1945, independently. Recently, it has been proved that nonclassical values (negative non-real values) KDD have ability outperforming their counterparts quantum computation, measurement so on. In this work, dividing states into KD-real (KD-free) KD-imaginary (KD-resource) ones based on a state, we establish resource theory for KD-imaginarity with...

Motivated by the importance of contextuality and a work on robustness entanglement mixed quantum states, (RoC) R C ( e ) an empirical model against non-contextual noises was introduced discussed in Science China Physics, Mechanics Astronomy (59(4) 59(9), 2016). Because are not always non-contextual, this paper introduces discusses generalized (GRoC) g general noises. It is proven that = 0 if only non-contextual. This means quantity can be used to distinguish contextual models from ones. also...

In this paper, we introduce a family of correlation measures relative to local channel in terms the metric-adjusted skew information for global state and reveal their fundamental properties. We quantify quantum states with respect several typical channels, including unitary twirling weak measurements, illustrate that induced by fully group is consistent completely depolarizing channel. particular, further evaluate correlations Bell diagonal states, Werner isotropic make comparative study...

Since the Gram matrix of a pure-state ensemble can be regarded as state, we quantify quantumness corresponding quantum by means coherence matrix. In particular, introduce two measures an based on Hilbert-Schmidt distance and skew information, respectively, investigate their fundamental properties. addition, notice that average maximum are independent choice reference basis, further propose to use generalized ensemble, find is not only related states in but also probability distribution. We...

Abstract The interest in quantum network correlations has surged, as Bell inequalities originating from a single source fall short of capturing the intricate many-body within generic networks. introduction 3-grade m -star network, natural extension star-shaped networks, features hierarchy nodes including A , stars B 1 …, centered around and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mi>C</mml:mi> </mml:mrow> <mml:mn>1</mml:mn>...

Abstract Objective Postpartum hemorrhage (PPH) is a leading cause of maternal death. Although guidelines have been updated, those with detailed protocols are limited for nursing practice. This study aims at establishing an early assessment and intervention protocol as toolkit PPH midwives obstetrical nurses. Methods Employing the evidence-based method, systematic Internet search was conducted appraisal literatures AGREE system Oxman-Guyatt Overview Quality Assessment Questionnaire (OQAQ),...