Sundays in a Quantum Engineer's Life

I am a Quantum Engineer, but on Sundays I have principles, John Bell opened his "underground colloquium" in March 1983, words which I will never forget! What! John Bell, the great John Bell, presented himself as an engineer!?! one of those people who make things work without even understanding how they function?!? whereas I thought of John Bell as one of the greatest theoretician.Comment: Talk presented at the Conference in Commemoration of John S. Bell, Vienna 10-14 November 2000. 4 pages & 3 figure

Experimental generation of entanglement from classical correlations via non-unital local noise

We experimentally show how classical correlations can be turned into quantum entanglement, via the presence of non-unital local noise and the action of a CNOT gate. We first implement a simple two-qubit protocol in which entanglement production is not possible in the absence of local non-unital noise, while entanglement arises with the introduction of noise, and is proportional to the degree of noisiness. We then perform a more elaborate four-qubit experiment, by employing two hyperentangled photons initially carrying only classical correlations. We demonstrate a scheme where the entanglement is generated via local non-unital noise, with the advantage to be robust against local unitaries performed by an adversary.Comment: 8 pages, 4 figure

Integration is a metaphysical fundamental

What are some metaphysical fundamentals which constitute the reality? This question has occupied philosophers for a long time. The western tradition once dealt with conceptions of earth, air, water, fire, ether whereas the eastern tradition has studied notions like yin-yang(陰陽), taiji(太極), lichi(理氣). The question is now being researched under the name of physicalism or naturalism, and yet what is not yet clarified is the relationship between electromagnetic force as the fundamental of the physical and consciousness as the fundamental of the mental. What is puzzling is that most philosophers insist on the overcoming of the traditional dualism while they tend to accept the distinction between electromagnetic force and consciousness. If they decide that the metaphysical paradigm of the duality is plausible then they should first present the grammar of functions of those concepts like individual, identity, causation. If they can see that the prospect of that traditional metaphysical paradigms are not hopeful, then they better start to look for an alternative metaphysical picture where the world can be understood more holistically. There have been alternative paradigms such as metaphysics of process and integration. It’s time to take a look at one of these. This paper tries to interpret the latter. The notion of integration(誠) has been the subject studied for a long time as a teaching of Zhongyong, one of the key Confucian texts. Many has taken the word “誠” of Zhongyong to mean sincerity or faithfulness. Certainly there are anthropological or ethical dimension to the meaning of the word. But the whole text seems to direct a reader to see how the world is, the metaphysical dimension of the world. I will interpret the major thrust of Zhongyong to say that integration is a metaphysical fundamental. If one is to accept the evolution thesis of the body of human being then she is also to concede the evolution thesis of the mind of human being. If one is positive toward the evolutionary theory of the human mind then she is more likely open-minded toward the powers of the mind of physical things. This may allow to proceed to a thesis that integration is an information consciousness(chapter 1). Suppose that physical things of the world are integrational. Then the integration is not to be given from the outside but from within. Then when things are integrational they become integrators. Integrators are bound to possess some sort of power. I will discuss the thesis that integration is a dispositional power(chapter 2). If all things are bundles of informations then information is ubiquitous(chapter 3) and things may be passive in certain contexts but are active toward their informations, processing them in their own ways. If these three hypotheses are reasonable then my thesis of integration as a metaphysical fundamental would be plausible

Entanglement structures in qubit systems

Using measures of entanglement such as negativity and tangles we provide a detailed analysis of entanglement structures in pure states of non-interacting qubits. The motivation for this exercise primarily comes from holographic considerations, where entanglement is inextricably linked with the emergence of geometry. We use the qubit systems as toy models to probe the internal structure, and introduce some useful measures involving entanglement negativity to quantify general features of entanglement. In particular, our analysis focuses on various constraints on the pattern of entanglement which are known to be satisfied by holographic sates, such as the saturation of Araki-Lieb inequality (in certain circumstances), and the monogamy of mutual information. We argue that even systems as simple as few non-interacting qubits can be useful laboratories to explore how the emergence of the bulk geometry may be related to quantum information principles.Comment: 55 pages, 23 figures. v2: typos fixed. v3: minor clarifications. published versio

it could rain weather forecasting as a reasoning process

Abstract Meteorological forecasting is the process of providing reliable prediction about the future weathear within a given interval of time. Forecasters adopt a model of reasoning that can be mapped onto an integrated conceptual framework. A forecaster essentially precesses data in advance by using some models of machine learning to extract macroscopic tendencies such as air movements, pressure, temperature, and humidity differentials measured in ways that depend upon the model, but fundamentally, as gradients. Limit values are employed to transform these tendencies in fuzzy values, and then compared to each other in order to extract indicators, and then evaluate these indicators by means of priorities based upon distance in fuzzy values. We formalise the method proposed above in a workflow of evaluation steps, and propose an architecture that implements the reasoning techniques