The Crossbar Latch
Not just a good name for a prog-rock band, HP's proposed crossbar latch is a switching structure on the scale of a few nanometers. More about this here, here, and here.
posted by Mister Spark at 4:28 PM
posted by Mister Spark at 4:28 PM
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HP: We have the next transistor
Claims 'crossbar latch' is the next step that will result in computers thousands of times faster.
February 1, 2005: 6:13 AM EST
NEW YORK (Reuters) - Hewlett-Packard Co. said Tuesday that its researchers have proven that a technology they invented could eventually replace the transistor, a fundamental building block of computers.
In a paper published in Tuesday's Journal of Applied Physics, HP said three members of its Quantum Science Research group propose and demonstrate a "crossbar latch," which provides the signal restoration and inversion required for general computing without the need for transistors.
HP (up $0.25 to $19.59, Research) said in a statement that the technology could result in computers that are thousands of times more powerful than those that exist today.
"We are reinventing the computer at the molecular scale," said Stan Williams, one of the authors of the paper, in a statement. "The crossbar latch provides a key element needed for building a computer using nanometer-sized devices that are relatively inexpensive and easy to build."
Phil Kuekes, another one of the paper's authors, said in a statement that transistors would continue to be used for years to come with conventional silicon circuits.
But, he added: "This could someday replace transistors in computers, just as transistors replaced vacuum tubes and vacuum tubes replaced electromagnetic relays before them."
Nanoscale latch could replace transistor, claims HP
By Peter Clarke , Silicon Strategies
February 01, 2005 (7:16 AM EST)
URL: http://www.eet.com/article/showArticle.jhtml?articleId=59300037
LONDON — Hewlett-Packard Company (Palo Alto, Calif.) claimed Tuesday (Feb. 1) that its researchers have proven that a technology they invented could replace the transistor, the fundamental building block of all contemporary computing and electronics. The company claims its nanometer-scaled "crossbar latch" could be the replacement for the transistor, just as the transistor relaced the vacuum tube in the middle of the last century.
In a paper published in the Journal of Applied Physics, three members of HP Labs' quantum science research (QSR) group have demonstrated a crossbar latch, which provides the signal restoration and inversion required for general computing without the need for transistors, HP said. The company went on to claim that the cross-bar latch could result in computers that are thousands of times more powerful than those in use today.
The latch consists of a single wire acting as a signal line, crossed by two control lines with an electrically switchable molecular-scale junction where they intersect. By applying a sequence of voltage impulses to the control lines and using switches oriented in opposite polarities, the latch can perform the NOT operation, which, along with AND and OR operations, the essential logic functions for general computing. In addition, the crossbar latch can restore a logic level in a circuit to a nominal voltage, which allows a designer to chain logic gates together to perform computations.
"The crossbar latch provides a key element needed for building a computer using nanometer-sized devices that are relatively inexpensive and easy to build," said Stan Williams, HP Senior Fellow and QSR director and one of the authors of the paper, in a statement issued by HP.
"Transistors will continue to be used for years to come with conventional silicon circuits but this could someday replace transistors in computers, just as transistors replaced vacuum tubes and vacuum tubes replaced electromagnetic relays before them," said Phil Kuekes, senior computer architect, QSR, another one of the paper's authors, in the same statement.
Kuekes was previously awarded a patent on the crossbar latch (U.S. 6,586,965) in July 2003, and the Journal of Applied Physics report, titled "The crossbar latch: Logic value storage, restoration and inversion in crossbar circuits," demonstrates the application of the technology.
Duncan Stewart, a QSR scientist and the third author, performed most of the testing that demonstrated that the device actually works. The paper underwent rigorous peer review before being published.
"We have previously demonstrated that we could make a working memory with molecular-scale junctions and logic devices that could perform simple logic operations such as AND and OR," Stewart said. "With the crossbar latch, we now have the final component theoretically needed for performing the multiple processing steps required for useful computing at the nanoscale."
Who Needs Transistors? HP Scientists Create New Computing Breakthrough at Molecular Scale
Research could send transistors the way of the vacuum tube
PALO ALTO, Calif., Feb. 1, 2005
HP today announced its researchers have proven that a technology they invented could replace the transistor - the fundamental building block of computers for the last half century - leading to a new way to construct computers in the future.
In a paper published in today's Journal of Applied Physics, three members of HP Labs' Quantum Science Research (QSR) group propose and demonstrate a "crossbar latch," which provides the signal restoration and inversion required for general computing without the need for transistors. The technology could result in computers that are thousands of times more powerful than those that exist today.
"We are re-inventing the computer at the molecular scale," said Stan Williams, HP Senior Fellow and QSR director, and one of the authors of the paper. "The crossbar latch provides a key element needed for building a computer using nanometer-sized devices that are relatively inexpensive and easy to build."
QSR works on nanoscale electronic devices that will first supplement, and someday perhaps replace, silicon technology, which is expected to reach its physical limits in about a decade. In addition to exploring the fundamental scientific principles of computing at the molecular level, QSR is also looking at architectural issues and determining how such tiny devices - thousands of which could fit across the diameter of a human hair - could be fabricated economically and in mass quantities.
The experimentally demonstrated latch consists of a single wire acting as a signal line, crossed by two control lines with an electrically switchable molecular-scale junction where they intersect. By applying a sequence of voltage impulses to the control lines and using switches oriented in opposite polarities, the latch can perform the NOT operation, which, along with AND and OR, is one of three basic operations that make up the primary logic of a circuit and are essential for general computing. In addition, it can restore a logic level in a circuit to its ideal voltage value, which allows a designer to chain many simple gates together to perform computations.
Standard semiconductor circuits require three-terminal transistors to perform the NOT operation and restore signals. However, it is generally believed that transistors will not be able to shrink down to the size of a few nanometers and remain operable.
"Transistors will continue to be used for years to come with conventional silicon circuits," said Phil Kuekes, senior computer architect, QSR, another one of the paper's authors, "but this could someday replace transistors in computers, just as transistors replaced vacuum tubes and vacuum tubes replaced electromagnetic relays before them."
Kuekes was previously awarded a patent on the crossbar latch (U.S. 6,586,965) in July 2003, and the Journal of Applied Physics report, titled "The crossbar latch: Logic value storage, restoration and inversion in crossbar circuits," demonstrates the application of the technology. Duncan R. Stewart, a QSR scientist and the third author, performed most of the testing that demonstrated that the device actually works. The paper underwent rigorous peer review before being published.
"We have previously demonstrated that we could make a working memory with molecular-scale junctions and logic devices that could perform simple logic operations such as AND and OR," Stewart said. "With the crossbar latch, we now have the final component theoretically needed for performing the multiple processing steps required for useful computing at the nanoscale."
The research on the crossbar latch was partially supported by the Defense Advanced Research Projects Agency (DARPA).
About HP
HP is a technology solutions provider to consumers, businesses and institutions globally. The company's offerings span IT infrastructure, global services, business and home computing, and imaging and printing. For the four fiscal quarters ended Oct. 31, 2004, HP revenue totaled $79.9 billion. More information about HP (NYSE, Nasdaq: HPQ) is available at http://www.hp.com.
This news release contains forward-looking statements that involve risks and uncertainties, as well as assumptions that, if they ever materialize or prove incorrect, could cause the results of HP and its consolidated subsidiaries to differ materially from those expressed or implied by such forward-looking statements and assumptions. All statements other than statements of historical fact are statements that could be deemed forward-looking statements, including the expected development, performance or rankings of products or services; statements of expectation or belief; and any statement of assumptions underlying any of the foregoing. Risks, uncertainties and assumptions include the development, performance and market acceptance of products and services and other risks that are described from time to time in HP's Securities and Exchange Commission reports, including but not limited to HP's Annual Report on Form 10-K for the fiscal year ended Oct. 31, 2004. HP assumes no obligation and does not intend to update these forward-looking statements.
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