ATOMTRONICS PDF

Today, they outline their vision for atomtronics, show how it works and explain why it could shape the future of information processing. The idea is to manipulate neutral atoms using lasers in a way that mimics the behaviour of electrons in wires, transistors and logic gates. Over the last decade or two, physicists at NIST and elsewhere have become masters at creating optical lattices in which atoms can be pushed pulled and prodded at will. But this kind of optical lion taming has limited appeal so Pepino and co have begun a program to put tame atoms to work. Pepino and co say that transferring atoms from one reservoir to another is a decent enough analogy and that this transfer can take place thorugh an optical lattice in which atoms tunnel at a uniform rate. What of more complex components?

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Today, they outline their vision for atomtronics, show how it works and explain why it could shape the future of information processing. The idea is to manipulate neutral atoms using lasers in a way that mimics the behaviour of electrons in wires, transistors and logic gates.

Over the last decade or two, physicists at NIST and elsewhere have become masters at creating optical lattices in which atoms can be pushed pulled and prodded at will. But this kind of optical lion taming has limited appeal so Pepino and co have begun a program to put tame atoms to work. Pepino and co say that transferring atoms from one reservoir to another is a decent enough analogy and that this transfer can take place thorugh an optical lattice in which atoms tunnel at a uniform rate.

What of more complex components? A diode is a device that allows electrons to travel in one direction when a voltage is applied but not in the other when the voltage is reversed.

This allows atoms to tunnel in one direction but not the other. In a similar way, the NIST team show how it is possible to create various kinds of atomtronic transistors and even an atomtronic AND gate.

From there, it is but a short step to atomtronic information processing. But why bother when we already have components like these that work perfectly well with electrons?

Pepino and pals say there are a number of reasons. Neutral atoms are easy to isolate from their environment and so may turn out to be useful for quantum computing. And unlike semiconductor lattices, optical lattices can be made more or less perfectly.

That will allow physicists to test the fundamental properties of logic circuits in a way that is entirely free of unwanted complications. So-called spintronics promises to revolutionise electronics because it allows information to be encoded in an entirely new way. Atomtronics could take that even further by offering entirely new ways to mess about with information. Neutral atoms can be fermions or bosons and the interactions between them can be long or short range, strong or weak and attractive or repulsive.

For that reason, atomtronics opens up exciting new ways to store and process information that cannot be done with electrons. That will have to wait for a future study. For the moment, Pepino and co appear to be single-handedly driving the field of atomtronics forward. So far their work appears to be largely theoretical. Perhaps they could do with some help to get the first atomtronic devices up and running.

Ref: arxiv.

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Atomtronics

Ultracold Atoms Atomtronics Atomtronics focuses on ultracold atom analogs of electronic circuits and devices. These systems aim to realize semiconductor and especially diode and transistor behavior in atomic systems. It is even possible to construct complete atomtronic circuits. Such circuits contain the analogue of electronic power supplies or batteries, and the necessary device connections.

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How To Build An Atomtronic Computer

What is the Bose Einstein Condensation In the early s Satyendra Nath Bose was studying the new idea at that time that the light came in little discrete packets we now call these "quanta" or "photons". Bose assumed certain rules for deciding when two photons should be counted up as either identical or different. We now call these rules "Bose statistics" or sometimes "Bose-Einstein statistics". Einstein guessed that these same rules might apply to atoms. He worked out the theory for how atoms would behave in a gas if these new rules applied. However, at very low temperatures, a large fraction of the atoms would suddenly go crashing down into the very lowest energy level and most of the atoms will be in the same quantum level.

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Resources Atomtronics At the heart of the atomtronics experiment is our window atom chip technology shown below. By patterning wires directly over the chip window it becomes possible to produce samples of ultracold atoms extremely close to a surface with high numerical aperture optical access. The optical window affords us significant versatility in regards to imaging and optical manipulation of magnetically trapped ultracold atoms. To this end we have developed a high numerical aperture microscope system from commercially available components for simultaneous optical projection and imaging. With our current atom chip design we can, in principle, work at numerical apertures of up to 0. Shown below is a schematic representation of this microscope system.

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