This book deals with certain important problems in Classical and Quantum Information Theory * Quantum Information Theory, A Selection of Matrix Inequalities * Stochastic Filtering Theory Applied to Electromagnetic Fields and Strings * Wigner-distributions in Quantum Mechanics * Quantization of Classical Field Theories * Statistical Signal Processing * Quantum Field Theory, Quantum Statistics, Gravity, Stochastic Fields and Information Problems in Information Theory It will be very helpful for students of Undergraduate and Postgraduate Courses in Electronics, Communication and Signal Processing. Print edition not for sale in South Asia (India, Sri Lanka, Nepal, Bangladesh, Pakistan or Bhutan).