E-Paper
Scientists discuss novel ideas of material science
FIVE EMINENT scientists delivered lectures on different topics relating to ?quantum computing? at the inaugural session of the conference.Karl L Kompa of Max-Planck Institute for Quantum Optics and University of Munich, Germany, while dwelling on molecular switches based on new emerging technologies discussed novel ideas of material science which were regarded as the basis for information technology, using ultra-short pulse lasers and their interaction with suitably designed molecules.
FIVE EMINENT scientists delivered lectures on different topics relating to ‘quantum computing’ at the inaugural session of the conference.
Karl L Kompa of Max-Planck Institute for Quantum Optics and University of Munich, Germany, while dwelling on molecular switches based on new emerging technologies discussed novel ideas of material science which were regarded as the basis for information technology, using ultra-short pulse lasers and their interaction with suitably designed molecules.
He said the main concern of scientists was to know what were the new technologies, and what were the switching materials, and how can we hope to integrate these switches in logic circuits to perform certain functions? He said the technologies were based on sub-nanoscience or single-molecule concepts.
Such building blocks provided the chance to be superior in space and time requirements in comparison to existing technologies.
He said: “A molecule in its dynamic changes undergoes several (often many) unitary transformations among its quantum states. This multitude of addressable and controllable transformations gives in principle a chance for multi-bit operations in single molecules. The transformations are best driven by fs- or sub-fs lasers, arranged and connected in due course. The transitions occur among the multitude of vibrational and electronic states of the molecules. The rules that govern these transitions are the usual quantum molecular transition rules aided by coherent laser control. Our studies began by investigating vibrational states for implementing suitable bit structures, but now also develop into areas of (purely) electronic motion of charge and energy in molecules.”
Jozef Gruska of Masaryk University, Botanicka, discussed the emergence of quantum informatics as a new important and broad area of science that explores phenomenon, laws and limitations of quantum information processing world and brings new methodology or all sciences that deal with the microworld.
He also stressed on the need for formulating long-term global goals, paradigms and methods of quantum informatics and to summarise main current challenges of quantum informatics.
R Simon from the Institute of Mathematical Sciences, Chennai, dwelt upon ‘Positive Maps and enlargement of Criteria’ said that given the density operator of a bipartite mixed state, it was not always easy to determine if the state is separable or entangled. “It is in this context that maps which are positive but not completely positive have played an absolutely important role in quantum information theory, leading to the so-called Peres-Horodecki inseparability criterion.”
After briefly reviewing some of the familiar inseparability criteria, he presented a new family of positive maps to demonstrate their power in witnessing inseparability.
Tasku Cheon from Japan spoke about the ‘Game Theory formulated on Hilbert Space’ and presented a simple, consistent and general formulation of game strategies on Hilbert space. He said it could be described cooperative strategies among game players without changing the basic structure of game theory based on individual payoff maximisation. “The theory is solvable for the two-strategy quantum game, which is shown to be equivalent to a family of classical games supplemented by phase interference. The theory is applicable to the game situation involving two quantum agents, thus serves as a unified formulation to describe classical and quantum games,” he added.
