First Electronic Quantum Processor Created
2009 07 01

ScienceDaily.com

A team led by Yale University researchers has created the first rudimentary solid-state quantum processor, taking another step toward the ultimate dream of building a quantum computer.


The two-qubit processor is the first solid-state quantum processor that resembles a conventional computer chip and is able to run simple algorithms. (Credit: Blake Johnson/Yale University)


They also used the two-qubit superconducting chip to successfully run elementary algorithms, such as a simple search, demonstrating quantum information processing with a solid-state device for the first time. Their findings appeared in Nature's advanced online publication June 28.

"Our processor can perform only a few very simple quantum tasks, which have been demonstrated before with single nuclei, atoms and photons," said Robert Schoelkopf, the William A. Norton Professor of Applied Physics & Physics at Yale. "But this is the first time they've been possible in an all-electronic device that looks and feels much more like a regular microprocessor."

Working with a group of theoretical physicists led by Steven Girvin, the Eugene Higgins Professor of Physics & Applied Physics, the team manufactured two artificial atoms, or qubits ("quantum bits"). While each qubit is actually made up of a billion aluminum atoms, it acts like a single atom that can occupy two different energy states. These states are akin to the "1" and "0" or "on" and "off" states of regular bits employed by conventional computers. Because of the counterintuitive laws of quantum mechanics, however, scientists can effectively place qubits in a "superposition" of multiple states at the same time, allowing for greater information storage and processing power.

For example, imagine having four phone numbers, including one for a friend, but not knowing which number belonged to that friend. You would typically have to try two to three numbers before you dialed the right one. A quantum processor, on the other hand, can find the right number in only one try.

"Instead of having to place a phone call to one number, then another number, you use quantum mechanics to speed up the process," Schoelkopf said. "It's like being able to place one phone call that simultaneously tests all four numbers, but only goes through to the right one."

These sorts of computations, though simple, have not been possible using solid-state qubits until now in part because scientists could not get the qubits to last long enough. While the first qubits of a decade ago were able to maintain specific quantum states for about a nanosecond, Schoelkopf and his team are now able to maintain theirs for a microsecond—a thousand times longer, which is enough to run the simple algorithms.

To perform their operations, the qubits communicate with one another using a "quantum bus"—photons that transmit information through wires connecting the qubits—previously developed by the Yale group.
The key that made the two-qubit processor possible was getting the qubits to switch "on" and "off" abruptly, so that they exchanged information quickly and only when the researchers wanted them to, said Leonardo DiCarlo, a postdoctoral associate in applied physics at Yale's School of Engineering & Applied Science and lead author of the paper.

Next, the team will work to increase the amount of time the qubits maintain their quantum states so they can run more complex algorithms. They will also work to connect more qubits to the quantum bus. The processing power increases exponentially with each qubit added, Schoelkopf said, so the potential for more advanced quantum computing is enormous. But he cautions it will still be some time before quantum computers are being used to solve complex problems.

"We're still far away from building a practical quantum computer, but this is a major step forward."


Authors of the paper include Leonardo DiCarlo, Jerry M. Chow, Lev S. Bishop, Blake Johnson, David Schuster, Luigi Frunzio, Steven Girvin and Robert Schoelkopf (all of Yale University), Jay M. Gambetta (University of Waterloo), Johannes Majer (Atominstitut der Österreichischen Universitäten) and Alexandre Blais (Université de Sherbrooke).
Article source: ScienceDaily.com




Related:

Jim Elvidge - Programmed Reality, The Power of 10, Science & The Soul

Nick Begich - Mind Control & Emerging Technologies






Related Articles
A short Introduction to Quantum Computation
Is Quantum Mechanics Controlling Your Thoughts?
How Time-Traveling Could Affect Quantum Computing
Nano-Diamonds Might Lead to Quantum Computing
'Light trap' is a Step Towards Quantum Memory
Quantum computer


Latest News from our Front Page

Cyclopean Masonry: A Mystery of the Ancient World
2014 04 16
They don’t make things like they used to, and that is, in some cases, a monumental understatement. Silly wordplay notwithstanding, there is something to be said for the construction techniques of the old world. Where modern buildings are designed to withstand the elements; wind, temperature extremes, earthquakes and floods, today’s engineers have to strike a balance between economics ...
Megalithic Origins : Ancient connections between Göbekli Tepe and Peru
2014 04 16
At 6,500 years older than Stonehenge and 7,000 years before the pyramids were constructed, a cult megalithic complex sat atop the hills near current day Sanliurfa, in southeast Turkey. Göbekli Tepe was flourishing an astonishing 12,000 - 14,000 years ago, and today, the preserved remains still exhibits high degrees of sophistication and megalithic engineering skill. Back in the 1990’s when ...
Department of Transportation Uses LRAD Sound Cannons Against Drivers
2014 04 16
The Missouri Department of Transportation revealed two newly acquired LRAD sound cannons this week, which will reportedly be used to target vehicles that speed in work zones. Coming in at $25,000 a piece, the Long-Range Acoustic Device, a sonic weapon best know for its use against protesters and insurgents in Afghanistan, will alert drivers to road conditions by shooting a loud ...
An ’Unknown Holocaust’ and the Hijacking of History
2014 04 16
An address by Mark Weber, director of the Institute for Historical Review, delivered at an IHR meeting in Orange County, California, on July 25, 2009. (A report on the meeting is posted here.) We hear a lot about terrible crimes committed by Germans during World War II, but we hear very little about crimes committed against Germans. Germany’s defeat in May ...
Ex-Mayor Bloomberg Starting $50 Million Gun-Control Network
2014 04 16
Former New York Mayor Michael Bloomberg ramped up his efforts to fight gun violence on Wednesday with a plan to spend $50 million on a grassroots network to organize voters on gun control. The initiative’s political target is the powerful pro-gun lobby, including the National Rifle Association, that spends millions of dollars each year to back gun-rights supporters. Bloomberg’s group, called Everytown ...
More News »