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“The rest is history. Sure, it takes more than 100,000 years for the process to complete, but this is how the Universe does it. This two-photon transition, rare though it is, is the process by which neutral atoms first form. It takes us from a hot, plasma-filled Universe to an almost-equally-hot Universe filled with 100% neutral atoms. Although we say that the Universe formed these atoms 380,000 years after the Big Bang, this was actually a slow, gradual process that took about 100,000 years on either side of that figure to complete. Once the atoms are neutral, there is nothing left for the Big Bang’s light to scatter off of. This is the origin of the CMB: the Cosmic Microwave Background.”
The Universe got off to a start in quite a hurry. By time just four minutes had passed since the Big Bang, we had already created more matter than antimatter, gotten rid of all the unstable, fundamental particles, given mass to the Universe, and fused the first elements of the periodic table. The next step would be to make neutral atoms: the building blocks of all the complex structure we know of in the cosmos. Yet it didn’t take minutes, hours, days, or even months. It took hundreds of thousands of years to get there; an eternity compared to all that came before.
Yet, after enough time went by, we made it. Here’s the cosmic story of what the Universe was like, and how we got there.
The Universe got off to a start in quite a hurry. By time just four minutes had passed since the Big Bang, we had already created more matter than antimatter, gotten rid of all the unstable, fundamental particles, given mass to the Universe, and fused the first elements of the periodic table. The next step would be to make neutral atoms: the building blocks of all the complex structure we know of in the cosmos. Yet it didn’t take minutes, hours, days, or even months. It took hundreds of thousands of years to get there; an eternity compared to all that came before.
Yet, after enough time went by, we made it. Here’s the cosmic story of what the Universe was like, and how we got there.
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Researchers achieve multifunctional solid-state quantum memory - The team of Li Chengfeng, Zhou Zongquan and others from the CAS Key Lab of Quantum Information developed a multi-degree-of-freedom (DOF) multiplexed solid-state quantum memory, and demonstrated photon pulse operation functions with time and frequency DOFs. The results were published in Nature Communications recently.
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An international team of researchers led by the University of Bristol have demonstrated that light can be used to implement a multi-functional quantum processor.
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Researchers have developed a single-atom transistor, the world's smallest. This quantum electronics component switches electrical current by controlled repositioning of a single atom, now also in the solid state in a gel electrolyte. The single-atom transistor works at room temperature and consumes very little energy, which opens up entirely new perspectives for information technology.
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In the everyday world, events occur in a definite order —your alarm clock rings before you wake up, or vice versa. However, a new experiment shows that when fiddling with a photon, it can be impossible to say in which order two events occur, obliterating our common sense notion of before and after and, potentially, muddying the concept of causality. Known as a quantum switch, the setup could provide a useful new tool in budding quantum information technologies.
Goswami et al. (2018) Indefinite Causal Order in a Quantum Switch: https://arxiv.org/abs/1803.04302
Goswami et al. (2018) Indefinite Causal Order in a Quantum Switch: https://arxiv.org/abs/1803.04302
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Recently I found that Quantum Mechanics may very well be entirely electromagnetic in nature. I have a habit of sharing ideas when I can fit the entire idea on a single page and not really find it anywhere online. This page shows that solutions of the well-known equations are not just probability density waves, but an electromagnetic vector field. Feedback preferred from those who have read the math.
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Quantum leap for Einstein’s scientific principle.
How Einstein’s equivalence principle extends to the quantum world has been puzzling physicists for decades, but a team including a University of Queensland researcher has found the key to this question.
How Einstein’s equivalence principle extends to the quantum world has been puzzling physicists for decades, but a team including a University of Queensland researcher has found the key to this question.
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Researcher accurately determines energy difference between two quantum states in the helium atom with unprecedented accuracy, a ground-breaking discovery that contributes to our understanding of the universe and space-time
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