Text C. Quantum Informatics and the Relations between Informatics, Physics and Mathematics ( 2, 500 characters).

A century ago hardly anyone would consider information an important concept for physics. One can even say that at that time one could hardly see information as a scientific concept at all. A significant breakthrough in the views on the relation between physics and information came, actually only after Landauer’s observation that information is physical: physical carriers are needed to store, transform and transmit information and therefore the laws and limitations of physics determine also the laws and limitations of information processing. An additional breakthrough came later with the view usually attributed to John Wheeler: physics is informational. Information processing phenomena, as well as their laws and limitations, are of key importance for understanding the laws and limitations of physics.

What are actually the main contributions of quantum information processing and communication (QIPC) to (quantum) physics?

They are numerous. On a very general level, QIPC should be seen as both an attempt to develop a new, more powerful, information processing technology, and as a new way to get deeper insights into the physical world, into its laws and limitations. QIPC gave rise to quantum informatics as the area of science combining goals and tools of both physics and informatics. QIPC is an area that brings new paradigms, goals, value systems, concepts, methods and tools to explore the physical world and its potential for information processing and communication is significant. On a more particular level, QIPC provides (quantum) physics with new concepts, models, tools, paradigms, images, analogies and makes many old concepts quantitative and more precise. In some cases, this even allowed to solve quite easily old problems. For example, an application of computability and complexity theories allowed to see that some old ideas about the physical world are wrong and that various proposals of modification of quantum mechanics are unlikely to work because they would allow the physical world to “easily” compute what is very likely beyond the classes BPP and BQP. Moreover, QIPC helped the understanding of phenomena that were considered for years strange and even mysterious, such as entanglement and non-locality. QIPC brought new measures allowing to quantify the power of various quantum resources and a deeper understanding of what can be and what cannot be distinguished and measured either exactly or approximately.

Moreover, as recently Barnum pointed out, the nature of information, its flow and processing, as seen from various operational perspectives, is likely to be the key to a unified view of the physical world in which quantum mechanics is its appropriate description, at least from certain points of view.

Finally, QIPC results brought new ways to use quantum phenomena for QIPC, not only through unitary operations, but also through adiabatic computations and, very surprisingly, through measurements only.

(Adapted from http://www.fi.muni.cz/usr/gruska/cris8.pdf)

<== попередня сторінка	\|	наступна сторінка ==>
Text B. Mathematical physics (2, 000 characters).	\|	Text D. Good Proofs and Bad Proofs

Не знайшли потрібну інформацію? Скористайтесь пошуком google:

Генерація сторінки за: 0.005 сек.