Navigation Links
Building quantum states with individual silicon atoms
Date:4/3/2013

By introducing individual silicon atom 'defects' using a scanning tunnelling microscope, scientists at the London Centre for Nanotechnology have coupled single atoms to form quantum states.

Published today in Nature Communications, the study demonstrates the viability of engineering atomic-scale quantum states on the surface of silicon an important step toward the fabrication of devices at the single-atom limit.

Advances in atomic physics now allow single ions to be brought together to form quantum coherent states. However, to build coupled atomic systems in large numbers, as required for applications such as quantum computing, it is highly desirable to develop the ability to construct coupled atomic systems in the solid state.

Semiconductors, such as silicon, routinely display atomic defects that have clear analogies with trapped ions. However, introducing such defects deterministically to observe the coupling between extended systems of individual defects has so far remained elusive.

Now, LCN scientists have shown that quantum states can be engineered on silicon by creating interacting single-atom defects. Each individual defect consisted of a silicon atom with a broken, or "dangling", bond. During this study, these single-atom defects were created in pairs and extended chains, with each defect separated by just under one nanometer.

Importantly, when coupled together, these individual atomic defects produce extended quantum states resembling artificial molecular orbitals. Just as for a molecule, each structure exhibited multiple quantum states with distinct energy levels.

The visibility of these states to the scanning tunneling microscope could be tuned through the variation of two independent parameters the voltage applied to the imaging probe and its height above the surface.

The study was led by Dr Steven Schofield, who said: "We have created precise arrays of atomic defects on a silicon surface and demonstrated that they couple to form unique and interesting quantum states."

He added: "The next step is to replicate these results in other material systems, for example using substitutional phosphorus atoms in silicon, which holds particular interest for quantum computer fabrication."

Ongoing research at the LCN is exploring even more complex arrangements of these defects, including the incorporation of impurity atoms within the defect structures, which is expected to alter the symmetry of the defects (similar to the role of the nitrogen atom in the nitrogen-vacancy center defect in diamond).


'/>"/>

Contact: Clare Ryan
clare.ryan@ucl.ac.uk
44-020-310-83846
University College London
Source:Eurekalert

Related biology technology :

1. New type of solar structure cools buildings in full sunlight
2. Designing interlocking building blocks to create complex tissues
3. Quantum devices: Building an innovative future for Canada
4. Researchers create building block of quanutm networks
5. Building better structural materials
6. HealthTech Capital Announces Awards for the HealthTech Conference 2012 - Building a Business in the New HealthTech Ecosystem
7. Building Wireless Solution More Important than Ever with New Tablets
8. New Study Building Framework to Bring Personalized Medicine to the Clinic
9. Arteriocyte Takes the Lead in Promoting Building Future Pipeline of Women in STEM Career Fields
10. Quantum computers counting on carbon nanotubes
11. Laser-like photons signal major step towards quantum Internet
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/12/2018)... ... 12, 2018 , ... NDA Partners Chairman Carl Peck, MD, ... of Regulatory Affairs and Quality Systems at WellDoc, Inc., has joined the firm ... Quality Systems at WellDoc, Inc., she conducted quality control and supplier audits, led ...
(Date:9/7/2018)... WESTMINSTER, Colo. (PRWEB) , ... September 06, 2018 ... ... for DMD, a fatal neuromuscular disease, has been validated to be as effective ... Quantitative Assessment of Dystrophin Staining in Frozen Muscle Biopsies,” was published in the ...
(Date:8/31/2018)... ... August 30, 2018 , ... Small, wireless and networked describes more than ... getting connected, too. Draper’s latest system is tiny in size, but is poised to ... factor in the new implant design is the growing awareness that disease often involves ...
(Date:8/29/2018)... POWAY, Calif. (PRWEB) , ... August 28, 2018 ... ... Harman, will be presenting the results of a safety study performed on an ... 2018 North American Veterinary Regenerative Medicine Association (NAVRMA) conference in September. He ...
Breaking Biology Technology:
(Date:9/7/2018)... ... 06, 2018 , ... CTL Medical Corporation has entered into ... business, which includes its complete portfolio of spine-related patents and 510ks, as well ... The deal will make CTL Medical the world’s exclusive provider of silicon nitride ...
(Date:8/31/2018)... ... 2018 , ... R3 Stem Cell, the nation's leader in ... The freezers are very convenient for practices to maintain regenerative biologics on hand ... and umbilical cord tissue. They are stored at -80 degrees Celsius, which keeps ...
(Date:8/31/2018)... ... 2018 , ... In recent years researchers have been increasing ... Longer-target engagement can result in improved efficacy and reduced side effects. Other methods ... the alteration of the molecules involved. The limitations of these methods make it ...
Breaking Biology News(10 mins):