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Dutch physicists get a grip on the spin of a single electron

From the Kavli Institute of Nanoscience

DELFT, Netherlands - Researchers of the Kavli Institute of Nanoscience at Delft University of Technology and the Foundation for Fundamental Research on Matter (FOM) have succeeded for the first time in the world in controlling the spin of a single electron in a nanostructure. They are able to rotate the spin to every possible direction and to record it accordingly. This achievement makes it possible to use the electron’s spin as a ‘quantum bit’, the basis of a (still theoretical) future quantum computer. The researchers have published this scientific breakthrough in a Nature article on 17 August 2006.

An electron does not only have an electrical charge, but it also behaves like an ultrasmall magnet. This is caused by the spinning of the electron around its axis, also called ‘spin’. The spin of a single electron can be used as a quantum bit, an important building block for the (theoretically speaking, superior) future quantum computer. In order to create this type of quantum bit, an electron in a semiconductor material is locked up in a quantum dot, which is a kind of electrical trap for the electron. Already in 2004, the Delft researchers succeeded in locking up a single electron and reading out the direction of its spin. Last year a research team of Harvard succeeded in getting control of the entanglement (the quantum mechanical linkage) of two electrons.

Locked up electrons

However, the final step to produce a real quantum bit, namely the possibility to rotate the spin of a single electron, remained beyond reach for a long time. The rotation of the spin is being executed by switching on and off a magnetic field that oscillates very fast during some billionths of a second. The interfering side effects of a locally generated magnetic field made it hard to rotate the electron spin and yet to keep it locked up at the same time.

Frank Koppens and the other researchers of the Delft team, led by dr. Lieven Vandersypen, were able to get around the side effects. Their approach was to lock up a second electron in another quantum dot alongside the first one and to use it to read out the spin direction of the first electron. A basic principle of quantum mechanics tells us that two electrons that have identically oriented spins cannot stay together, while two electrons that have different spins can. Each time after the spin was rotated, a check was made to see whether two electrons were able to reside close together or not. This then defined to what extend the spin direction was changed.

At the moment further research is being executed by combining the materialized basic ingredients to get a quantum bit. Koppens argues that now the way has been prepared to start executing elementary quantum computations. According to him it may be even more inviting to uncover the peculiar properties of quantum physics with these insights, for example, by revealing the entanglement of the two electrons. Entanglement is also the central theme of the FOM research Focus Group for Solid-State Quantum Information Processing at Delft University and supported by the University of Leiden, which the Vandersypen team is part of.

 

 
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Social Networking: technology of digital interaction

by Larry Ketchersid

The power of social networking is seen in everyday events and world shaking movements. Some examples are mundane: people sending out electronic bulletins looking for new jobs, new living quarters, new mates, using their social network to solicit responses. Some are newsworthy, such as the personal interactive blogs from people affected by Hurricane Katrina, the conflicts in the Middle East, and other major events. Others are socially profound, such as the recent swell of support on MySpace started by a lady in Iceland to help a science fiction magazine based out of Kentucky stay afloat when its creditors came calling.

Daniel Goleman, author of Social Intelligence, cites recent findings in biology and brain science as evidence that humans are biologically “wired to connect.” Until recently, the technology has not been available to enable multiple – or rapid - interactions. Two hundred years ago, if a person had an idea or a question, or simply wanted to discuss something with someone of similar tastes, their scope was limited to within walking distance. If, through a newspaper or word of mouth, someone knew of a distant expert, he could get a letter to them over a matter of weeks, and then wait weeks for a response

Fast forward to MySpace, Hi5, Xanga, LinkedIn, Wikipedia and the world of digital social networking. Initially categorized as a playground for teenagers and musical groups, social networking sites have grown to encompass many facets of human interaction. I originally joined MySpace to watch out for my fifteen year-old son after he expressed a desire to have an account. In adult fashion I assumed I would only participate occasionally to monitor his online activities. But, after building a personal MySpace profile and an additional profile for my recently published novel, my social network grew to include old high school friends, fellow technologists (some whom I had never met), other martial artists (most of whom I will never meet) and others with similar interests in science fiction, business and other areas I listed on my “profile page.” And yes, I found some bands I would not have otherwise found that matched my musical interest.

Many social networking sites rank among the most visited web sites in the world. The largest are the general interest sites, such as MySpace (> 110 million users) and Hi5 (50 million). But there are sites for particular countries ( Cyworld, South Korea, 15 million; Mixi, Japan, 5 million), ethnic groups (BlackPlanet.com for African-Americans and MiGente.com for Latinos), and business (LinkedIn, 6.5 million). Then there are special interest sites like Match.com, (dating); Care2 (activists); WAYN (travel); CarDomain (speaks for itself).

LinkedIn, which is a business-oriented social networking site, offers an excellent visual representation of this “connectedness” phenomenon. In my LinkedIn account, my 1 st level connections (people with whom I have mutually agreed to have a direct linkage to either through my request or theirs) number 91. My 2 nd level (my connection’s connections) number over 4,800. My “LinkedIn Network” (my 3 rd level) exceeds 443,000. Through this network I can pass and receive requests for introductions, job opportunities and referrals.

The technologies underneath these offerings are well-established and surprisingly similar across all of the major sites. They are integrated fully and presented in a simplistic manner so that a neophyte can easily use them and be online, building their own network in a matter of minutes. These basic technological building blocks include:

    - a homepage, where the user can enter usually predefined profile information about themselves, username, likes and dislikes, pictures, videos, education and company information. For the most part, this information is optional. These pages are web pages (HTML) and are searchable and index-able through Google, Yahoo, et al, thus furthering their online reach As they are web pages, those with the technical know-how can use codes to customize the look and feel of their pages (as my fifteen year-old son calls it, “pimping your MySpace”)

    - a method of linking or connecting to other users, plus a method for inviting new users to join; this is how you expand your social network

    - a method for searching for other users, either through tags or other search criteria; for example, a user may search on people who are interested in Mayan history, or find people who attended the same school

    - publishing technology, usually a blog or journal, and a means to subscribe to other users’ published ideas. These pages are also web pages, and their content will be indexed through search engines as well

    - two-way interaction, such as chat and messaging

    - ranking (also known as recommendations, high-fives, etc.); this ranking can be of blogs, pictures, even rankings of the participants themselves

Far-reaching consequences

Social networking also has some unintended but potentially far-reaching consequences. First, these social networking solutions are enabling the creation of massive amounts of user-generated content, the vast majority of it already tagged and searchable. This includes not only a wealth of newly created fiction, art, pictures and videos, but user-generated accounts of actual events, facts, and opinions, giving an alternative to the mainstream media. Secondly, mini-celebrities are being self-created via intelligent marketing on social networks.

There is, of course, a downside to these networks. While ease of publishing user-generated content is the foundation of knowledge-sharing in social networking, its ease of use invites abuse. Through MySpace bulletins, for example, I have been notified of a five part “Legends of Atlantis” documentary that has recently been made available on Google Video. But I also receive silly surveys, spam and the occasional solicitation. In some sites, there is also no surety of identity, i.e., there is no mechanism for checking the validity of a person’s name, age, location and other statistics. In contrast, there could be loss of privacy. Some sites already include location technologies such as Frapper, with the specter of including additional information such as GPS data looming.

Some people include total immersion sites (with avatars, the building of skills and/or environments, and even their own currency) such as Second Life and World of Warcraft as social networking sites. It is difficult to include these in this category as defined above, as they allow for little profile building and limited networking.

Today, social networking is mostly reading and writing, using a minimum of our senses for human interaction. It is also limited in its worldwide reach As it is an integration of existing technologies, social networking will continue to evolve as certain technological barriers are overcome:

    - Internet penetration in the rest of the world (landlines or cellular); according to Internet World Stats (www.internetworldstats.com), Europe and North America contain 17.5% of the world’s population but a disproportionate 49.5% of the world’s Internet users. Africa, by contract, contains 14.1% of the population, but only 3.6% of the Internet users.

    - Language translation on-line; my desire to discuss Qigong and martial arts with a Chinese practitioner who understands little English will not be circumvented by my knowledge of twenty Mandarin words and three symbols. Near real-time language translation, exemplified by phrase and web site translation services such Alta Vista’s Babelfish, will need to be more accurate and bolted-onto existing social network interactions. As Internet penetration continues, this will become a larger barrier. Again citing Internet World Stats, only 10.8% of the 1.3 billion Chinese speaking people are currently on-line, as opposed to much higher usage rates in more networked countries (67.2% Japanese speakers, 61.3% German speakers);

    - Two-way audio and video (as opposed to one-way, download and view); According to comScore Media Metrix, MySpace in July 2006 has already surpassed traditional video sites such as Google, Yahoo and newcomer YouTube in number of individual video streams. More multiple media also implies a prerequisite for worldwide Broadband penetration (landlines or cellular). In October 2006, Google acquired YouTube for $1.65 billion!

    - Integration across multiple social networks; as these networks grow, many people have multiple accounts in the different networks. Some folks post their blogs multiple times, so that they may be seen on MySpace, Amazon, Blogger, etc. Some efforts are already underway, such as the Internet Address Book, which facilitates putting all of your social network contact information into one place.

    - Mobility; some networks are already offering fledgling mobile extensions. The availability and easy access of camera phones, GPS and other phone features offer additional avenues for user generated content with the possibility of automatic publishing through your social network.

Many of our readers are probably already connected to one of the many social networks. All that is required is a computer, and Internet connection, and a desire to interact. Social networking sites are also quite addicting. The user will have to determine if addiction to these sites is a positive or a negative.


Larry Ketchersid is an entrepreneurial technologist. A former executive with Compaq, he has led large technology companies as well as initiated several
small startups. He is a martial artist, rugby player, writer, and family man. His first novel is Dusk Before the Dawn. He lives in Texas with his wife, son and daughter.

 

 



   
 
 
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