Future 'quantum computers' will offer increased efficiency... and risksMarch 06, 2008UCF Professor makes unique discovery, may revolutionize encryption technology An unusual observation in a University of Central Florida physics lab may lead to a new generation of "Quantum Computers" that will render today's computer and credit card encryption technology obsolete. The observations are documented this week in the online version of Nature Physics under Advance Online Publication (http://www.nature.com/nphys/index.html ). The title of UCF Professor Enrique del Barco's paper is "Quantum Interference of Tunnel Trajectories between States of Different Spin Length in a Dimeric Molecular Nanogmagnet." Consumers, credit card companies and high-tech firms rely on cryptography to protect the transmission of sensitive information. The basis for current encryption systems is that computers would need thousands of years to factor a large number, making it very difficult to do. However, if del Barco's observation can be fully understood and applied, scientists may have the basis to create quantum computers -- which could easily break the most complicated encryption in a matter of hours. Del Barco said the observation may foster the understanding of quantum tunneling of nanoscale magnetic systems, which could revolutionize the way we understand computation. "This is very exciting," del Barco said. "When we first observed it, we looked at each other and said, 'That can't be right.' We did it again and again and we achieved the same result every time." According to quantum mechanics, small magnetic objects called nanomagnets can exist in two distinct states (i.e. north pole up and north pole down). They can switch their state through a phenomenon called quantum tunneling. When the nanomagnet switches its poles, the abrupt change in its magnetization can be observed with low-temperature magnetometry techniques used in del Barco's lab. The switch is called quantum tunneling because it looks like a funnel cloud tunneling from one pole to another. Del Barco published paper shows that two almost independent halves of a new magnetic molecule can tunnel, or switch poles, at once under certain conditions. In the process, they appear to cancel out quantum tunneling. "It's similar to what can be observed when two rays of light run into interference," del Barco said. "Once they run into the interference you can expect darkness." Controlling quantum tunneling shifts could help create the quantum logic gates necessary to create quantum computers. It is believed that among the different existing proposals to obtain a practical quantum computer, the spin (magnetic moment) of solid-state devices is the most promising one. "And this is the case of our molecular magnets," del Barco said. "Of course, this is far from real life yet, but is an important step in the way. We still must do more research and a lot of people are already trying to figure this out, including us. It's absolutely invigorating." Co-authors of the paper are Christopher Ramsey from UCF, Stephen Hill from the University of Florida and Sonali J. Shah, Christopher C. Beedle and David N. Hendrickson from the University of California at La Jolla. Del Barco, who is a native of Spain, began teaching at UCF in 2005. He got a Ph. d degree from the University of Barcelona before moving onto New York University where he worked with Andrew Kent, a well-known quantum physicist. It was the warm weather and the dynamic of UCF that drew him and his family to UCF. Aside from teaching physics and working on research, Del Barco is a published writer. He penned a science fiction novel that has been published in Spain by Editorial Equipo-Sirius. He collaborates with scientists from around the world including researchers in Spain, Hong Kong and across the United States. University of Central Florida |
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| Related Quantum Computer Current Events and Quantum Computer News Articles NIST demonstrates 'universal' programmable quantum processor Physicists at the National Institute of Standards and Technology (NIST) have demonstrated the first "universal" programmable quantum information processor able to run any program allowed by quantum mechanics-the rules governing the submicroscopic world-using two quantum bits (qubits) of information. Field experiment on a robust hierarchical metropolitan quantum cryptography network Key Laboratory of Quantum Information (CAS), University of Science and Technology of China has recently demonstrated a metropolitan Quantum Cryptography Network (QCN) for Government Administration in Wuhu, China. Because of its scientific significance and social impact, the project is reported in Volume 54, Issue 17 (September, 2009) of the Chinese Science Bulletin authored by Fang-xing Xu et al. Diamonds may be the ultimate MRI probe, say Quantum physicists Diamonds, it has long been said, are a girl's best friend. But a research team including a physicist from the National Institute of Standards and Technology (NIST) has recently found that the gems might turn out to be a patient's best friend as well. Experiments at UCSB push quantum mechanics to higher levels Scientists at UC Santa Barbara have devised a new type of superconducting circuit that behaves quantum mechanically -- but has up to five levels of energy instead of the usual two. The findings are published in the August 7 issue of Science. A Police Woman Fights Quantum Hacking and Cracking The first desktop computers changed the way we managed data forever. Three decades after their introduction, we rely on them to manage our time, social life and finances - and to keep this information safe from prying eyes and online predators. Physicists find way to control individual bits in quantum computers Physicists at the National Institute of Standards and Technology (NIST) have overcome a hurdle in quantum computer development, having devised* a viable way to manipulate a single "bit" in a quantum processor without disturbing the information stored in its neighbors. Scientists create first electronic quantum processor A team led by Yale University researchers has created the first rudimentary solid-state quantum processor, taking another step toward the ultimate dream of building a quantum computer. Manipulating light on a chip for quantum technologies A team of physicists and engineers at Bristol University has demonstrated exquisite control of single particles of light - photons - on a silicon chip to make a major advance towards long-sought-after quantum technologies, including super-powerful quantum computers and ultra-precise measurements. NIST physicists demonstrate quantum entanglement in mechanical system Physicists at the National Institute of Standards and Technology (NIST) have demonstrated entanglement-a phenomenon peculiar to the atomic-scale quantum world-in a mechanical system similar to those in the macroscopic everyday world. UCSB researchers describe breakthrough in the quantum control of light Researchers at UC Santa Barbara have recently demonstrated a breakthrough in the quantum control of photons, the energy quanta of light. More Quantum Computer Current Events and Quantum Computer News Articles |
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