Encyclopedia of Science

[CynthiaA]

A quantum (computer) step

Study shows it's feasible to read data stored as nuclear 'spins'
A University of Utah physicist took a step toward developing a superfast computer based on the weird reality of quantum physics by showing it is feasible to read data stored in the form of the magnetic "spins" of phosphorus atoms.

"Our work represents a breakthrough in the search for a nanoscopic [atomic scale] mechanism that could be used for a data readout device," says Christoph Boehme, assistant professor of physics at the University of Utah. "We have demonstrated experimentally that the nuclear spin orientation of phosphorus atoms embedded in silicon can be measured by very subtle electric currents passing through the phosphorus atoms."

The study by Boehme and colleagues in Germany will be published in the December issue of the journal Nature Physics and released online Sunday, Nov. 19.

"We have resolved a major obstacle for building a particular kind of quantum computer, the phosphorus-and-silicon quantum computer," says Boehme. "For this concept, data readout is the biggest issue, and we have shown a new way to read data."

Boehme, who joined the University of Utah faculty earlier this year, conducted the study with Klaus Lips – a former colleague at the Hahn-Meitner Institute in Berlin – and with graduate students Andre Stegner and Hans Huebl and physicists Martin Stutzmann and Martin S. Brandt of the Technical University of Munich.

A Bit about Quantum Computing

In modern digital computers, information is transmitted by flowing electricity in the form of electrons, which are negatively charged subatomic particles. Transistors in computers are electrical switches that store data as "bits," in which "off" (no electrical charge) and "on" (charge is present) represent one bit of information: either 0 or 1.

For example, with three bits, there are eight possible combinations of 1 or 0: 1-1-1, 0-1-1, 1-0-1, 1-1-0, 0-0-0, 1-0-0, 0-1-0 and 0-0-1. But three bits in a digital computer can store only one of those eight combinations at a time.

Quantum computers, which have not been built yet, would be based on the strange principles of quantum mechanics, in which the smallest particles of light and matter can be in different places at the same time.

In a quantum computer, one "qubit" – quantum bit – could be both 0 and 1 at the same time. So with three qubits of data, a quantum computer could store all eight combinations of 0 and 1 simultaneously. That means a three-qubit quantum computer could calculate eight times faster than a three-bit digital computer.

Typical personal computers today calculate 64 bits of data at a time. A quantum computer with 64 qubits would be 2 to the 64th power faster, or about 18 billion billion times faster. (Note: billion billion is correct.)
Researchers are exploring many approaches to storing and processing information in nanoscopic form – on the scale of molecules and atoms, or one billionth of a meter in size – for quantum computing. They include optical quantum computers that would hold data in the form of on-off switches made of light, ions (electrically charged atoms), the size or energy state of an electron's orbit around an atom, so-called "quantum dots" of material and the "spins" or magnetic orientation of the centers or nuclei of atoms.

A New Spin on Quantum Computers

Boehme's new study deals with an approach to a quantum computer proposed in 1998 by Australian physicist Bruce Kane in a Nature paper titled "A silicon-based nuclear spin quantum computer." In such a computer, silicon – the semiconductor used in digital computer chips – would be "doped" with atoms of phosphorus, and data would be encoded in the "spins" of those atoms' nuclei. Externally applied electric fields would be used to read and process the data stored as "spins."

Spin is difficult to explain. A simplified way to describe spin is to imagine that each particle – like an electron or proton in an atom – contains a tiny bar magnet, like a compass needle, that points either up or down to represent the particle's spin. Down and up can represent 0 and 1 in a spin-based quantum computer, in which one qubit could have a value of 0 and 1 simultaneously.

In the new study, Boehme and colleagues used silicon doped with phosphorus atoms. By applying an external electrical current, they were able to "read" the net spin of 10,000 of the electrons and nuclei of phosphorus atoms near the surface of the silicon.

A real quantum computer would need to read the spins of single particles, not thousands of them. But previous efforts, which used a technique called magnetic resonance, were able to read only the net spins of the electrons of 10 billion phosphorus atoms combined, so the new study represents a million-fold improvement and shows it is feasible to read single spins – something that would take another 10,000-fold improvement, Boehme says.

But the point of the study, he adds, is that it demonstrates it is possible to use electrical methods to detect or "read" data stored as not only electron spins but as the more stable spins of atomic nuclei.

"We discovered a mechanism that will allow us to measure the spins of the nuclei of individual phosphorus atoms in a piece of silicon when the phosphorus is close [within about 50 atoms] to the surface," Boehme says. With improved design, it should be possible to build a much smaller device that "lets us read a single phosphorus nucleus."

Details of the Experiment

The researchers used a piece of silicon crystal about 300 microns thick – about three times the width of a human hair – less than 3 inches long and about one-tenth of an inch wide. The silicon crystal was doped with phosphorus atoms. Phosphorus atoms were embedded in silicon because too many phosphorus atoms too close together would interact with each other so much that they couldn't store information. The concept is that the nuclear spin from one atom of phosphorus would store one qubit of information.

The scientists used lithography to print two gold electrical contacts onto the doped silicon. Then they placed an extremely thin layer of silicon dioxide – about two billionths of a meter thick – onto the silicon between the gold contacts. As a result, the device's surface had tiny spots where the spins of phosphorus atoms could be detected.

The scientists applied a tiny voltage to the gold contacts, creating an electrical current perhaps 10,000 times smaller than that produced by an AA-size battery, Boehme says. When the current was measured during 100 millionths of a second, it stayed constant, indicating the spins of the phosphorus atoms in the silicon were random, with half pointing up and half pointing down.

Then the device was chilled with liquid helium to 452 degrees below zero Fahrenheit. That made most of the phosphorus spins point down. Next, the researchers applied a magnetic field and microwave radiation to the sample, which makes the phosphorus spins constantly flop up and down in concert for a few billionths of a second.

As a result, the electrical current fluctuated up and down.

"That is basically a readout of phosphorus electron spins," which, in turn, also can be used to determine the spins of the phosphorus atoms' nuclei based on a previously known relationship between electron spins and nuclear spins, Boehme says.

While Boehme is excited by this advance, numerous obstacles remain before quantum computing becomes a reality.

"If you want to compare the development of quantum computers with classical computers, we probably would be just before the discovery of the abacus," he says. "We are very early in development."

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I do not know very much about computer technology, but this seems like a great place for physics and computers to meet. It is interesting they are using heat and cold to control the spin of the particles. I am not truly familiar with " 1 0 1 0" and what that exactly means. My guess is it has something to do with computers locating or interpreting information.

Any commentary would be appreciated.

CynthiaA

[CynthiaA]

I found a book, "Programming the Universe" by Seth Lloyd.

Dr. Lloyd (to the best of my knowledge) is the only person on the globe who has designed a working quantum computer. The book is amazing. I did not truly understand that quantum computing is....well particle physics! LOL

I carried this book to the college with me and gave it to friends on several occassions before having an opportunity to read it. Everyone is so interested in quantum computers I am surprised no one has posted in this thread. The latest copy of the book arrived and I am reading it before I have an opportunity to give it away (again)!

Some of the principles of quantum computing align with some thought I have about light, which make it that more fascinating to consider QC. Anyone at all reading this with any thought about QC, I am more than interested and ready to have a truly great conversation! Please post!

Cyndi

[gullyfourmyle]

Think of it as a new dimension. A whole other universe. This time created by man. That makes us a race of Gods. Now suppose we are in a universe that was created in exactly the same way by beings larger than us by the same scale...

[CynthiaA]

[quote="gullyfourmyle"]Think of it as a new dimension. A whole other universe. This time created by man. That makes us a race of Gods. Now suppose we are in a universe that was created in exactly the same way by beings larger than us by the same scale...[/quote]

Well....not a new dimension. It is a way of applying particle physics. It seems like to me there are scientists who create theorems about particles. Then there are particle physicists who experiment to prove or disprove the theorems. Then there are scientists like Dr. Lloyd who apply the knowledge in ways useful to humans.

Dr. Lloyd is a scientist finding useful applications for particles. He is brilliant. The book is amazing. This is my first encounter with quantum computing. I have learned quite a bit about quantum computers and quantum theory. [Thank you, Dr. Lloyd!]

Particles make up the universe. Everything records, only NOT in the commonly accepted form known by the general population. Dr. Lloyd explains the idea of everything recording in relation to quantum computing, which involves the laws of Thermodynamics in order to truly assist the reader in understanding. It is from this perspective (the perspective Dr. Lloyd explains about everything recording) that programming the universe truly is related too. It is in this context the universe is a giant computer.

Dr. Lloyd also explains how he believes as the universe advances there are occurrances such as galaxies, etc., which occur during specific periods in the process of this expansion. He explains this from a true quantum computer scientist point of view. It is quite fascinating to read and consider. At the same time a chemist might explain the universe as a giant mesh of interaction of elements (which would also be true). It is all about perspective.

The particles were already in place. We did not invent or create them. Humans strive to understand particles through quantum theories. We try to determine what particles are made of and how they interact through experimentation. We attempt to manipulate particles through quantum computing. In all of these disciplines there is still much to learn.

[treelover]

The 1010 that wasnt understood....

In maths is called binary. In conventional computers it is the presence or absense of electricity.
So in 1010 you would have 4 wires,
one with electricity supplied to it, one without, one with and one without.
mathematically you would represent wires with electricity as 1 and without as 0.

In decimal (based on the idea of 10'ness) maths, in the unit column you would count 0 to 9, before having to start again at 0. To count a number above 9 you would create a new column to the left of the unit column called the 'tens' column. The tens column would count the number of times the unit column had returned to 0. So 1 + 9 = 0 in the units column and 1 cycle of the unit colmn in the tens column - in other worlds 10.

With binary you would count 0 to 1. The first column would be the units column, the next column to the left would now not be called the tens column but the ones column. If you wanted to show 1 + 1, then the unit colomn would cycle from 1 to 0, and the one column would show 1 cycle of the unit column - in other words 10. In decimal, binary 10 would be 2.

decimal 3 is binary 11
decimal 4 is binary 100
decimal 5 is binary 101
decimal 6 is binary 110
decimal 7 is binary 111
decimal 8 is binary 1000
decimal 9 is binary 1001
decimal 10 is binary 1010

There's your answer, binary 1010 is equal to decimal 10.

The wierdness of quantum computers increases I believe when tou consider that they dont work on binary but 'trinary' Counting from 0 to 2 before cycling. In terms of the physical description of wires above you check the spin of an atom, so instead of the presence or absence of electricity you measure the spin.

So 3 states exist,
State 1 = spin up.
State 2 = spin down.
State 3 = Spin up and down.

Its the 3rd state thats the most difficult idea to get your head around.
The best way of thinking about it is the imagine that you 'dont' measure the spin. State 1 and two are when you measure an atoms spin and state 3 is when you dont measure an atoms spin.

Measure measure dont measure
Spin up Spin down spin up and down
State 1 State 2 State 3

I hope you have followed my description.

Cheers BoB