# Category Archives: Quantum physics

## Introducing impurities

The most extensive use of semiconductors, such as silicon or germanium, including their use as transistors, arises from their behavior when, after being sufficiently purified of atoms other than the basic element (e.g., silicon or germanium), very small amounts […]

## The loophole-free quantum entanglement experiment (3): The detection loophole

Let‘s continue with the story of the development of the loophole-free Bell experiment. As we discussed in the first post, it is possible to prove that the universe is either non-real, meaning that the outcomes of some experiments […]

## Impurities and spin Hall effects in graphene

The interactions between moving charges and magnetic fields can be quite complicated; more if we consider the quantum effects. One example is the collection of Hall effects. There are analogues of these effects for spin and the detection of the […]

## The complementarity principle

Quantum mechanics was founded upon the existence of the wave–particle dualism of light and matter, and the enormous success of quantum mechanics, including the probability interpretation, seems to reinforce the importance of this dualism. But how can a particle be […]

## The loophole-free quantum entanglement experiment (2): The locality loophole

In our previous post, we have discussed the importance of a loophole-free entanglement experiment. Now, we are going to discuss one of the most important loopholes for this kind of experiments, the locality (or communication) loophole.

To understand the […]

## An acoustic quantum bus

At a fundamental level the term “quantum computing” implies de use of quantum effects that have no classical analogue to process information. In a “classical computer” information is held in bits, which can have two alternative values (0 and 1). […]

## The loophole-free quantum entanglement experiment (1): Bell’s Theorem.

Recently, a new experiment has attracted a lot of attention. It was published in Nature and entitled as “Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres” . Many scientific and non-scientific media took account of the […]

## Shrinking plasmonic nanomatryoshkas

We know that incident light can provoke a strong optical response in metallic nanostructures due to the excitation of resonant plasmonic modes, i.e, the electrons in the metal become excited by the photons in the incident light and oscillate collectively. […]

## Quantum Physics + Genetic Engineering = Enhanced Energy Transport

A hot topic of research nowadays is the energy transfer in quantum systems. One important reason for this interest is the famous 2007 experiment that suggests quantum effects in the dynamics of the photosynthetic complex FMO, from the green sulfur […]

## Visualizing charge oscillations on a metal surface

With “many-body problem” we usually make reference to one that is very difficult to obtain exact solutions for, because the system involves interactions between more than two bodies. This kind of problem appears both in classical and quantum systems.

In […]