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:4/20/2017)... ... ... NetDimensions appoints Bill Mastin, a learning technology veteran, as its new Senior Vice ... technologies industry, Mastin joins NetDimensions from the New York office of learning and engagement ... served as SVP of the North America offices and prior to that, he held ...
(Date:4/20/2017)... ... April 20, 2017 , ... Energetiq Technology ... announced today that Chief Executive Officer (CEO) Debbie Gustafson has been appointed to ... global industry association connecting the electronics manufacturing supply chain. The mission of the ...
(Date:4/20/2017)... ... April 20, 2017 , ... Open Therapeutics and the ... sharing and commercialization model. , The Center for Advancing Innovation helps institutions maximize ... effort is bringing the IP to the attention of the entrepreneurial community and ...
(Date:4/20/2017)... Israel , April 20, 2017  BrainStorm ... stem cell technologies for neurodegenerative diseases, announced today that ... Alliance for Regenerative Medicine,s (ARM) 5 th Annual Cell ... at 09:40 EDT in Boston . ... Chief Medical Officer & Chief Operating Officer, will participate in ...
Breaking Biology Technology:
(Date:4/11/2017)... DUBLIN , Apr. 11, 2017 Research ... Tracking Market 2017-2021" report to their offering. ... The global eye tracking market to grow at ... The report, Global Eye Tracking Market 2017-2021, has been prepared based ... report covers the market landscape and its growth prospects over the ...
(Date:4/6/2017)... -- Forecasts by Product Type (EAC), Biometrics, ... (Transportation & Logistics, Government & Public Sector, Utilities / ... Facility, Nuclear Power), Industrial, Retail, Business Organisation (BFSI), Hospitality ... looking for a definitive report on the $27.9bn Access ... ...
(Date:4/5/2017)... -- KEY FINDINGS The global market for ... of 25.76% during the forecast period of 2017-2025. The ... the growth of the stem cell market. ... INSIGHTS The global stem cell market is segmented on ... stem cell market of the product is segmented into ...
Breaking Biology News(10 mins):