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Sunday, February 7, 2016

Nature is non local again...and geometric?

The really interesting thing of this new quantum fundamental property is geometry plays a main role. It's not like the importance of geometry for Gravity but it's the first time someone tested in a electromagnetic field.
According to General Relativity gravity is a mere consequence of space-time geometry. In this experiment researches show how the geometry of the circuit is crucial to this new way of dynamical nonlocality detected in a electromagnetic field. Why is so important at nanoscale the geometry of the circuit? That's the really interesting question to work on it. Electromagnetic field is affecting in much more short distances than gravity field. Maybe decoherence is hiding this geometric effect at macro-scale. But at nano-scale is clear the decisive influence of geometry in the interference due to the electromagnetic field of the electrons flow.
Is Nature a matter of geometry finally?

Nonlocality is a key feature discriminating quantum and classical physics. Quantum-interference phenomena, such as Young’s double slit experiment, are one of the clearest manifestations of nonlocality, recently addressed as dynamical to specify its origin in the quantum equations of motion. It is well known that loss of dynamical nonlocality can occur due to (partial) collapse of the wavefunction due to a measurement, such as which-path detection. However, alternative mechanisms affecting dynamical nonlocality have hardly been considered, although of crucial importance in many schemes for quantum information processing. Here, we present a fundamentally different pathway of losing dynamical nonlocality, demonstrating that the detailed geometry of the detection scheme is crucial to preserve nonlocality. By means of a solid-state quantum-interference experiment we quantify this effect in a diffusive system. We show that interference is not only affected by decoherence, but also by a loss of dynamical nonlocality based on a local reduction of the number of quantum conduction channels of the interferometer. With our measurements and theoretical model we demonstrate that this mechanism is an intrinsic property of quantum dynamics. Understanding the geometrical constraints protecting nonlocality is crucial when designing quantum networks for quantum information processing.

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