Quantum mechanics shows several counter-intuitive results when we are dealing with composite systems [1–3]. There exist peculiar type of correlations between different parts of a composite system commonly known as non-classical correlations. Entanglement is one of the most powerful non-classical correlation that establishes its importance in different information processing tasks. However, seve...

we study the dynamics of two three-level atoms interacting with independent bosonic lorentzian reservoirs at zero temperature. such systems can be created in far astronomical objects. quantum mechanical behaviour of these particles can produce detectable effects on the spectroscopic identifications of these objects, if such behaviour remain stable during the interaction with their media. it is ...

In the present work, we consider a scenario where an arbitrary two-qubit pure state is applied for the quantum key generation (QKG). Using the twirling procedure to convert the pure state into a Werner state, the error rate of the key can be reduced by a factor of 2/3. This effect indicates that entanglement is not the sufficient resource of QKG protocol since it is not increased in the twirlin...

Quantum entanglement and quantum nonlocality are known to exhibit monogamy; that is, they obey strong constraints on how they can be distributed among multipartite systems. Quantum correlations that comprise and go beyond entanglement are quantified by, e.g., quantum discord. It was observed recently that for some states quantum discord is not monogamous. We prove, in general, that any measure ...

Quantum discord is a measure of the quantumness of correlations. After reviewing its different versions and properties, we apply it to the questions of quantum information processing. First we show that changes in discord in the processed unentangled states indicate the need for entanglement in the distributed implementation of quantum gates. On the other hand, it was shown that zero system-env...

for teenagers in Japan The editorial by Butler & Malone focused on non-suicidal selfinjury (NSSI), proposed as a new category in DSM-5, and described the criteria of this item. The authors also provided information about NSSI among young people. In Japan in August 2012, the Japanese Cabinet decided to enhance suicide prevention measures for younger people, given the increasing suicide rate amon...

This paper illustrates the basis of, expectations for and evaluation of prevention from an epidemiological perspective. Specifically, the extent to which epidemiologists could and should be involved in designing and evaluating public health interventions is addressed. Changes in the view on disease causation and epidemiology's role for the future of public health are discussed. Examples from ca...

In quantum information theory, discord has been proposed as a tool to characterise the presence of "quantum correlations" between subparts given system. Whether system behaves quantum-mechanically or classically is believed be impacted by phenomenon decoherence, which originates from unavoidable interaction this and an environment. Generically, decoherence associated with decrease state purity,...