Out-of-time-order correlators (OTOCs) can be used to probe how quickly a quantum system scrambles information when the initial conditions of dynamics are changed. In sufficiently large systems, one extract from OTOC analog Lyapunov coefficient that describes timescale on which classical chaotic becomes scrambled. OTOCs have been applied only very limited number toy models, such as Sachdev-Ye-Ki...

The delocalization or scrambling of quantum information has emerged as a central ingredient in the understanding thermalization isolated many-body systems. Recently, significant progress been made analytically by modeling non-integrable systems stochastic systems, lacking Hamiltonian picture, while honest dynamics are frequently limited to small system sizes due computational constraints. In th...

With the significant development in communication systems especially in the public channels through which our information travels, there are more increasing in the channels problems. The information security is the important one that should be enhanced. This paper presents a chaos-based speech scrambling system. Chaotic maps have been successfully used for large-scale data encryption such as im...

Engineering drawings are ubiquitously used for capturing, conveying and archiving innovative engineering designs. Many engineering companies’ core intellectual property resides in their proprietary engineering drawings. Therefore, protection of such vital data is extremely important. This paper provides a swap-transformation matrix based approach to scramble engineering drawings in order to ena...

Most of the common password scramblers hinder passwordguessing attacks by “key stretching”, e.g., by iterating a cryptographic hash function many times. With the increasing availability of cheap and massively parallel off-the-shelf hardware, iterating a hash function becomes less and less useful. To defend against attacks based on such hardware, one can exploit their limitations regarding to th...

Pilot contamination is one of the main impairments in multi-cell massive Multiple-Input Multiple-Output systems. In order to improve channel estimation this context, we propose use a semi-blind estimator based on constant modulus algorithm (CMA). We consider an enhanced version CMA namely Modified which modifies cost function sum functions for real and imaginary parts. Due pilot contamination, ...