Navigation Links
Single-atom writer a landmark for quantum computing

A research team led by Australian engineers has created the first working quantum bit based on a single atom in silicon, opening the way to ultra-powerful quantum computers of the future.

In a landmark paper published today in the journal Nature, the team describes how it was able to both read and write information using the spin, or magnetic orientation, of an electron bound to a single phosphorus atom embedded in a silicon chip.

"For the first time, we have demonstrated the ability to represent and manipulate data on the spin to form a quantum bit, or 'qubit', the basic unit of data for a quantum computer," says Scientia Professor Andrew Dzurak. "This really is the key advance towards realising a silicon quantum computer based on single atoms."

Dr Andrea Morello and Professor Dzurak from the UNSW School of Electrical Engineering and Telecommunications lead the team. It includes researchers from the University of Melbourne and University College, London.

"This is a remarkable scientific achievement governing nature at its most fundamental level and has profound implications for quantum computing," says Dzurak.

Dr Morello says that quantum computers promise to solve complex problems that are currently impossible on even the world's largest supercomputers: "These include data-intensive problems, such as cracking modern encryption codes, searching databases, and modelling biological molecules and drugs."

The new finding follows on from a 2010 study also published in Nature, in which the same UNSW group demonstrated the ability to read the state of an electron's spin. Discovering how to write the spin state now completes the two-stage process required to operate a quantum bit.

The new result was achieved by using a microwave field to gain unprecedented control over an electron bound to a single phosphorous atom, which was implanted next to a specially-designed silicon transistor. Professor David Jamieson, of the University of Melbourne's School of Physics, led the team that precisely implanted the phosphorous atom into the silicon device.

UNSW PhD student Jarryd Pla, the lead author on the paper, says: "We have been able to isolate, measure and control an electron belonging to a single atom, all using a device that was made in a very similar way to everyday silicon computer chips."

As Dr Morello notes: "This is the quantum equivalent of typing a number on your keyboard. This has never been done before in silicon, a material that offers the advantage of being well understood scientifically and more easily adopted by industry. Our technology is fundamentally the same as is already being used in countless everyday electronic devices, and that's a trillion-dollar industry."

The team's next goal is to combine pairs of quantum bits to create a two-qubit logic gate the basic processing unit of a quantum computer.


Contact: Bob Beale
University of New South Wales

Related biology technology :

1. Legendary Author And Screenwriter Nora Ephron Passes Away At 71; Solar Cigarette Pays Tribute To Such A Rare Talent
2. FirstMarks Landmark Clinical Study Successfully Completed that Fulfills the Unmet Need to Access the Risk of Near Term MI
3. The quantum world only partially melts
4. Imprisoned molecules quantum rattle in their cages
5. Nature: Electronic read-out of quantum bits
6. Quantum physics: New insights into the remote control of quantum systems
7. UK research paves way to a scalable device for quantum information processing
8. Researchers tune the strain in graphene drumheads to create quantum dots
9. Quantum bar magnets in a transparent salt
10. Metamaterials, quantum dots show promise for new technologies
11. En route to a quantum computer
Post Your Comments:
Related Image:
Single-atom writer a landmark for quantum computing
(Date:11/30/2015)... Md. , Nov. 30, 2015  Northwest Biotherapeutics ... company developing DCVax® personalized immune therapies for solid tumor ... adding an additional independent director, and the Company welcomes ... of allegations in a recent anonymous internet report on ... both initiatives. Linda Powers stated, "We ...
(Date:11/30/2015)... N.J. and PETACH TIKVAH, Israel ... (NASDAQ: BCLI ), a leading developer of adult ... wholly-owned subsidiary, Brainstorm Cell Therapeutics Ltd., has been awarded an ... Office of the Chief Scientist (OCS). This grant, the ... Brainstorm for 2015 activities to approximately $1.8 million (approximately NIS7 ...
(Date:11/27/2015)... 2015 /PRNewswire/--  Mallinckrodt plc (NYSE: MNK ), ... has closed the sale of its global contrast media ... Euronext) in a transaction valued at approximately $270 million. ... a total of approximately 1,000 employees spread across the ... Louis area. This entire workforce and the ...
(Date:11/27/2015)... , November 27, 2015 ... Growing popularity of companion diagnostics is one ... biomarkers market with pharmaceutical companies and diagnostic ... diagnostic tests. . ... Complete report on global cancer biomarkers market ...
Breaking Biology Technology:
(Date:11/12/2015)... Nov. 11, 2015   Growing need for ... tools has been paving the way for use ... of discrete analytes in clinical, agricultural, environmental, food ... predominantly used in medical applications, however, their adoption ... due to continuous emphasis on improving product quality ...
(Date:11/9/2015)... , Nov. 9, 2015  Synaptics Inc. (NASDAQ: ... today announced broader entry into the automotive market with ... match the pace of consumer electronics human interface innovation. ... are ideal for the automotive industry and will be ... Europe , Japan ...
(Date:10/29/2015)... Va. , Oct. 29, 2015 Daon, ... today that it has released a new version of ... customers in North America have ... IdentityX v4.0 also includes a FIDO UAF certified ... are already preparing to activate FIDO features. These customers ...
Breaking Biology News(10 mins):