A semi-classical non-Hamiltonian model of a spontaneous collapse of unstable quantum system is given. The time evolution of the system becomes non-Hamiltonian at random instants of transition of pure states to reduced ones, η 7→ Cη, given by a contraction C. The counting trajectories are assumed to satisfy the Poisson law. A unitary dilation of the concractive stochastic dynamics is found. In p...

We conduct an analysis of ideal error correcting codes for randomized unitary channels determined by two unitary error operators – what we call “binary unitary channels” – on multipartite quantum systems. In a wide variety of cases we give a complete description of the code structure for such channels. Specifically, we find a practical geometric technique to determine the existence of codes of ...

This work addresses digital communication in a wireless system with multiple antennas at transmitter and/or receiver when the channel state information is unknown at the transmitter as well as at the receiver. We propose a generalized bandwidth-efficient space-time differentially coded orthogonal non-unitary matrix modulation scheme with non-coherent soft-output detector. Most proposals which a...

An improved method is developed for eigenvalue and eigenvector placement of a closed-loop control system using either state or output feedback. The method basically consists of three steps. First, the singular value or QR decomposition is used to generate an orthonormal basis that spans admissible eigenvector space corresponding to each assigned eigenvalue. Second, given a unitary matrix, the e...

Recently unitary space-time modulation has been presented to give a solution to more reliable multiple antennas communications. Good-performing unitary constellations are required to be designed to fit into this system. Although the basic principle is well understood and certain criteria and their transformations for designing such constellations have been presented, we don’t have a general met...

A turbo decoding scheme for a noncoherent, unitary space-time modulated [3] communication system employing an FEC convolutional code is proposed. The channel is assumed to be Rayleigh fading with neither the transmitter nor the receiver knowing the channel coefficients. The convolutional encoder is applied to the information symbols before performing unitary spacetime coding. Treating the combi...

The addition of a topologically massive term to an admittedly nonunitary three-dimensional massive model, be it an electromagnetic system or a gravitational one, does not cure its non-unitarity. What about the enlargement of avowedly unitary massive models by way of a topologically massive term? The electromagnetic models remain unitary after the topological augmentation but, surprisingly enoug...

Nepal moved from unitary system with a three-level federal system of government. As federalism accelerates, the national health system can also speed up its own decentralization process, reduce disparities in access, and improve health outcomes. The turn towards federalism creates several potential opportunities for the national healthcare system. This is because decision making has been devolv...

Abstract Entanglement of multipartite quantum systems is an important resource in the field information processing. Using a measure global entanglement and notion concurrence, properties for three-qubit system are studied classified terms local unitary classes. The connection such classification with polytope also discussed.