Seminar on 'Physics of Quantum Computation', by Boris Altshuler
On March 21 a seminar on 'Physics of Quantum Computation' by Boris Altshuler (Columbia University, New York) will be held.
Development of devices for quantum computation is now extremely popular field, which is generously supported by both industry and government agencies and enjoys tremendous progress. However a clear understanding of advantages of the quantum information processing as compared to classical ones is far from being achieved.
A classical computer consists of a large number of bits – systems that have two possible states, e.g. 0 and 1. Each state of a classical computer is fully characterized by the states of all its bits – sequences of numbers 0 and 1 usually called bit-strings. The number of the possible bit-strings, can be enormously big. Among the most interesting for the practical applications are optimization problems, which can be reduced to a search for a minimum of some particular function of bit-strings. It is likely although not proven that classical computer needs exponentially long time to solve such problems. The most desirable would be to develop a quantum computer able to accelerate solution of optimization problems as compared to the best classical algorithms.
Quantum states of a system of qubits are linear combinations of different bit-strings. Accordingly the amount of information contained in a given quantum state increases exponentially with N. In order to understand how to control the quantum states of a system of qubits one can use methods developed in the physics of many-body systems, in particular, the theory of Many-Body Anderson Localization.
The talk will be devoted to discussion of such analysis and its possible quantum algorithms that it suggests.
Start time: 11:00
Address: 21/4 Staraya Basmannaya, bld.5, room Б-807
Working language: English
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