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Category: quantum physics – Page 908

Toward tailoring Majorana bound states in artificially constructed magnetic atom chains on elemental superconductors

Realizing Majorana bound states (MBS) in condensed matter systems is a key challenge on the way toward topological quantum computing. As a promising platform, one-dimensional magnetic chains on conventional superconductors were theoretically predicted to host MBS at the chain ends. We demonstrate a novel approach to design of model-type atomic-scale systems for studying MBS using single-atom manipulation techniques. Our artificially constructed atomic Fe chains on a Re surface exhibit spin spiral states and a remarkable enhancement of the local density of states at zero energy being strongly localized at the chain ends. Moreover, the zero-energy modes at the chain ends are shown to emerge and become stabilized with increasing chain length. Tight-binding model calculations based on parameters obtained from ab initio calculations corroborate that the system resides in the topological phase. Our work opens new pathways to design MBS in atomic-scale hybrid structures as a basis for fault-tolerant topological quantum computing.

Majorana fermions —particles being their own antiparticles—have recently attracted renewed interest in various fields of physics. In condensed matter systems, Majorana bound states (MBS) with a non-Abelian quantum exchange statistics have been proposed as a key element for topological quantum computing (2–4). One of the most promising platforms to realize MBS are one-dimensional (1D) helical spin systems being proximity-coupled to a conventional s-wave superconductor (5–9). In such a surface-confined system, the MBS can directly be investigated by local probe techniques such as scanning tunneling microscopy/spectroscopy (STM/STS). Previously reported experiments aiming at the direct visualization and probing of the MBS have focused on self-assembled magnetic chains on superconducting Pb substrates (10–15).

Light could make semiconductor computers a million times faster or even go quantum

A technique to manipulate electrons with light could bring quantum computing up to room temperature.

A team of researchers in Germany and at the University of Michigan have demonstrated how can shift electrons between two different , the classic 1 and 0, in a thin sheet of semiconductor.

“Ordinary electronics are in the range of gigahertz, one billion operations per second. This method is a million times faster,” said Mackillo Kira, U-M professor of electrical engineering and computer science.

Does Mystery of Quantum Physics Prove God Exists?

Ironically, my more popular posts are ones furthest from my passion and core interests. They are larks—never intended to go viral. This is about one of them…

Apart from family, I typically steer clear of religious topics. I identify with a mainstream religion, but it is completely beside the purpose of Lifeboat Foundation, and it is a personal affair.[1]

Yet, here we discuss a religious topic, after all. Let’s get started…

Question

Do atheists agree that the fact that we can’t understand
quantum physics is at least somewhat evidence of Allah?

An Objective Answer

Do you assert that a failure to understand something is evidence of God?

I don’t fully understand a triple-Lutz (ice skating) or the Jessica stitch (needlepoint)—and I certainly don’t get why an electric dryer leaves moisture on light weight linens, when a gas dryer gets them bone-dry before the plush towels.

Is my inability to solve these mysteries evidence of Allah (or Yahweh, haShem or Y’Shewa)? Of course, not! It has nothing to do with God or religion. The fact that I don’t quite grasp every complex task or unexplained science is not evidence of God, it is evidence of my own ignorance.

On the other hand, I am fortunate to understand quantum physics—both academically and from an innate perspective. That is, behavior of waves and matter on a subatomic scale make perfect sense to me.

You would be correct to point out that certain quantum behavior seems to violate common sense:

  • Probabilistic behavior. (i.e. Schrödinger’s cat is both dead and alive at once)
  • Measure photons or electrons as a wave, and it no longer behaves like particles
  • Entangled electrons (Einstein called it ‘Spooky action at a distance’)
  • The EPR Paradox (entanglement experiment demonstrates causality based on future knowledge. It seems profoundly unbelievable!)

But these things only seem strange, because we do not experience them first hand given our size and our senses. As the math and the mechanisms are understood through research and experimentation, the behavior begins to fit within physical laws as we understand them. Then, we can extrapolate (predict) other behaviors.

For example, as we begin to understand quantum mechanics, we can design a computer, an encryption mechanism—and eventually a teleportation system—that exploits the physical properties and laws.

1 I do not appreciate the outreach of evangelism. In my opinion, religious discussion is best amongst a like-minded community.

Continue reading “Does Mystery of Quantum Physics Prove God Exists?” | >

A new physics discovery could change the game for quantum computing

From tunneling through impenetrable barriers to being in two places at the same time, the quantum world of atoms and particles is famously bizarre. Yet the strange properties of quantum mechanics are not mathematical quirks—they are real effects that have been seen in laboratories over and over.

One of the most iconic features of quantum mechanics is “entanglement”—describing particles that are mysteriously linked regardless of how far away from each other they are. Now three independent European research groups have managed to entangle not just a pair of particles, but separated clouds of thousands of atoms. They’ve also found a way to harness their technological potential.

When particles are entangled they share properties in a way that makes them dependent on each other, even when they are separated by large distances. Einstein famously called entanglement “spooky action at a distance,” as altering one particle in an entangled pair affects its twin instantaneously—no matter how far away it is.

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