Theory of Quantum Computation, Communication, and Cryptography: Third Workshop, TQC 2008 Tokyo, Japan, January 30 - February 1, 2008, Revised Selected Papers (Lecture Notes in Computer Science, 5106)

This book constitutes the thoroughly refereed post-workshop proceedings of the Third Workshop on Theory of Quantum Computation, Communication, and Cryptography, TQC 2008, held in Tokyo, Japan, in January/February 2008. The 10 revised full papers presented were carefully selected during two rounds of reviewing and improvement. The papers present current original research and focus on theoretical aspects of quantum computation, quantum communication, and quantum cryptography, which are part of a larger interdisciplinary field that casts information science in a quantum mechanical framework. Front Matter....Pages - Classical and Quantum Algorithms for Exponential Congruences....Pages 1-10 Quantum Algorithms for Evaluating Min - Max Trees....Pages 11-15 Irreversibility of Entanglement Loss....Pages 16-28 Quadratic Form Expansions for Unitaries....Pages 29-46 Improved Constructions of Quantum Automata....Pages 47-56 An Application of the Deutsch-Jozsa Algorithm to Formal Languages and the Word Problem in Groups....Pages 57-69 An Elementary Optical Gate for Expanding Symmetrically Shared Entanglement....Pages 70-82 Security Bounds for Quantum Cryptography with Finite Resources....Pages 83-95 On the Design and Optimization of a Quantum Polynomial-Time Attack on Elliptic Curve Cryptography....Pages 96-104 Architecture of a Quantum Multicomputer Implementing Shor’s Algorithm....Pages 105-114 Back Matter....Pages -