Posts Tagged ‘quantum mechanical’

The quantization of space

Quantum mechanics defines our observable physical environment only in terms of the probabilistic values associated with Schrödinger’s wave equation. More specifically it defines a particle in terms of the instantaneous collapse of a wave function which it assumes extends form one edge of the universe to the other. Schrodinger Equation and Material Waves However this […]

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The quantum properties of non-point particles

Quantum theory: it’s unreal We know that everything in the universe including particles have physical size. Even so for the past 50 years, the Standard Model of particle physics which many say has given us the most complete mathematical description of the particles and forces that shape our world ignores this fact and treats them […]

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Quantum mechanics as an emergent property of space-time.

Is the quantization of energy/mass a fundamental or an emergent characteristic of reality. Quantum mechanics assumes that it is fundamental because it defines all interactions within it in terms of its quantized properties while one could say that Einstein’s General Theory of Relativity defines it in terms of an emergent property of continuous space-time manifold […]

The relevance of classical mechanics to a quantum environment.

Presently there is disconnect between our understanding of the probabilistic world of quantum mechanics and the classical one of causality because it can predict with precision the future position of an object while the other cannot. However this may just be an illusion resulting from a lack of understanding of the quantum environment. One of […]

Photodissociation of ultracold diatomic strontium molecules with quantum state control

Chemical reactions at ultracold temperatures are expected to be dominated by quantum mechanical effects. Although progress towards ultracold chemistry has been made through atomic photoassociation, Feshbach resonances and bimolecular collisions, these approaches have been limited by imperfect quantum state selectivity. In particular, attaining complete control of the ground or excited continuum quantum states has remained a challenge. Here we achieve this control using photodissociation, an approach that encodes a wealth of information in the angular distribution of outgoing fragments. By photodissociating ultracold 88Sr2 molecules with full control of the low-energy continuum, we access the quantum regime of ultracold chemistry, observing resonant and nonresonant barrier tunnelling, matter–wave interference of reaction products and forbidden reaction pathways. Our results illustrate the failure of the traditional quasiclassical model of photodissociation and instead are accurately described by a quantum mechanical model. The experimental ability to produce well-defined quantum continuum states at low energies will enable high-precision studies of long-range molecular potentials for which accurate quantum chemistry models are unavailable, and may serve as a source of entangled states and coherent matter waves for a wide range of experiments in quantum optics.

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