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Full Description
This volume contains contributions based on the lectures delivered and posters presented at the Fifth International Conference on Quantum Communication, Measurement and Computing (QCM&C-Y2K). This Conference is the fifth of a successful series hosted this time in Italy, was held in Capri, 3-7 July, 2000. The conference was attended by more than 200 participants from all over the world. There was also a high level of participation from graduate students, who greatly benefited from the opportunity to attend world-class conferences. The Conference Hall was hosted in La Residenza Hotel in Capri, where part of p- ticipants where housed, while others where housed in various cozy nearby - tels. All enjoyed the pleasant atmosphere offered by the island of Capri. There were 59 invited lectures given as oral presentations of 30 minutes and 94 poster papers. The major topics covered at the Conference where new experimental and theoretical results in quantum information. They were divided in five parts; i) Quantum Information and Communication, ii) Quantum Measurement, - coherence, and Tomography, iii) Quantum Computing, iv) Cryptography, v) Entanglement and Teleportation. We were lucky in that almost all major - perimental groups in the world working in this area were represented, as were the major theoreticians. There was very active audience participation. A n- ber of graduate students and post-docs were able to present their contributions in four after dinner poster sessions.
Contents
Quantum Information and Quantum Communication.- Additivity/Multiplicativity Communication Channels.- Universal Copying of Coherent States: A Gaussian Cloning Machine.- at]Quantum Random Coding Exponent of a Symmetric State Alphabet.- Information and Distance in Hilbert Space.- Superadditivity With Mixed Letter States.- Quantum State Recognition.- Superadditivity in Capacity of Quantum Channel by Classical Pseudo-Cyclic Codes.- Property of Mutual Information for M-ary Quantum-State Signals.- Performances of Binary Block Codes Used on Binary Classical-Quantum Channels.- Quantum Measurement, Decoherence, and Tomography.- Entropy and Information Gain in Quantum Continual Measurements.- Experimental Quantum State Discrimination.- Spontaneous Intrinsic Decoherence in Rabi Oscillations Experiments.- Quantum Tomography, Teleportation, and Cloning.- Decoherence Versus the Idealization of Microsystems as Correlation Carriers Between Macrosystems.- Quantum Measurement, Information, and Completely Positive Maps.- ON the Number of Elements Needed in a POVM Attaining the Accessible Information.- Einselection and Decoherence from an Information Theory Perspective.- Reconstructing the Discrete Wigner Function through Complementary Measurements.- Statistical Noise in Measuring Correlated Photon Beams.- Reconstruction Technique for a Trapped Electron.- Quantum Mechanics without Statistical Postulates.- Quantum Retrodiction.- Quantum-Tomography Method in Information Processing.- Quantum Measurement Problem and State Dual Representations.- Homodyne Characterizations of Active Optical Media.- Quantum Cloning Optimal for Joint Measurements.- How Many Projections are Needed in Quantum Tomography of Spin States?.- Quantum Computing.- The Representation of Numbers by States in Quantum Mechanics.- Towards Quantum Computation with Trapped Calcium Ions.- Physical Limits to Computation.- Realising Quantum Computing: Physical Systems and Robustness.- Information Analysis of Quantum Gates for Simulation of Quantum Algorithms on Classical Computers.- Quantum Probabilistic Subroutines and Problems in Number Theory.- Theory of the Quantum Speed Up.- Quantum Gates Using Motional States in an Optical Lattice.- Quantum Error-Correcting Code for Burst Error.- Non-Dissipative Decoherence in Ion-Trap Quantum Computers.- Optical Qubit Using Linear Elements.- Atom Chips.- Decoherence and Fidelity of Single Qubit Operations in a Solid State Quantum Computer.- Cryptography.- Long Distance Entangled State Quantum Key Distribution.- Bunching and Antibunching from Single NV Color Centers in Diamond.- Violation of Locality and Self-Checking Source: A Brief Account.- The Unconditional Security of Quantum Key Distribution.- Anonymous-Key Quantum Cryptography and Unconditionally Secure Quantum Bit Commitment.- Quantum Key Distribution Using Multilevel Encoding.- Authority-Based User Authentication And Quantum Key Distribution.- Improvement of Key Rate for Yuen-Kim Cryptoscheme.- Stable Solid-State Source of Single Photons.- Entanglement and Teleportation.- Non-Locality and Quantum Theory: New Experimental Evidence.- On Entangled Quantum Capacity.- Control of Squeezed Light Pulse Spectrum in the Kerr Medium with an Intertial Nonlinearity.- Macroscopic Quantum Superposition by Amplification of Entangled States.- Quantum Teleportation with Atomic Ensembles and Coherent Light.- Entangled State Based on Nonorthogonal State.- Long-Distance High-Fidelity Teleportation Using Singlet States.- Quantum Teleportation with Complete Bell State Measurement.- Complete Quantum Teleportation with a Crossed-Kerr Nonlinearity.- Quantum Lithography.- Experimental Test of Local Realism Using Non-Maximally Entangled States.- New Schemes for Manipulating Quantum States with a Kerr Cell.- Local and Nonlocal Properties of Werner States.- Maximally Entangled Mixed States in two Qubits.- Engineering Bell-Like States of Two High-Q Cavity Fields.- Nondissipative Decoherence and Entanglement in the Dynamics of a Trapped Ion.- Entanglement Manipulation and Concentration in Mixed States.- Ramsey Interferometry with a Single Photon Field in Cavity QED.- Entanglement Transformation At Dielectric Four-Port Devices.- Quantum Noise in Polarization Measurement and Polarization Entanglement.- Bright EPR-Entangled Beams for Quantum Communication.- Polarization in Quantum Optics: A new Formalism and Two Experiments.- Spin Squeezing and Decoherence Limit in Ramsey Spectroscopy.- Teleportation of Entanglement for Continuous Variables.- Generation and Detection of Fock States of the Radiation Field.
