An International Research Journal

Vol 27 nos 8-10, 2018


SSN : 0971 - 3093

Vol 27, No 8-10, August-October, 2018

Special Issue of Asian Journal of Physics

dedicated to

Prof T Asakura

Asian Journal of Physics                                                                                                                Vol. 27 No 8-10, (2018), 00-00


Quantum Limited (Security) Communication


Francis T S Yu
Emeritus Evan Pugh Professor of Electrical Engineering
the Pennsylvania State University: University Park, PA 16802


In this article, I will show that information-transmission (IT) can be carried out within is a quantum unit, as defined by the Heisenberg Uncertainty Principle, in which this unit can be translated as a quantum limited subspace (QLS).  We will show the size of a QLS is determined by the carrier bandwidth; that is narrower the bandwidth the larger the size of the QLS can be used for complex amplitude communication. By understanding the pros and the cons of IT within the QLS, more innovative communication techniques can be developed and employed in practice.  For examples; such as applied to security IT within the QLS, Imaging using phase conjugation idea will be illustrated. A new era of innovative communication is anticipated to immerge and they will change the way we used to communicate forever!  © Anita Publications. All rights reserved.

Keywords: Information Transmission, Heisenberg Uncertainty Principle, Quantum Unit, Quantum Limited Subspace, Carrier Bandwidth, Security Communication, Phase Conjugation Communication.

Total Refs : 11


Asian Journal of Physics                                                                                                                Vol. 27 No 8-10, (2018), 00-00

Three-dimensional correlation properties of speckles produced by

diffractal-illuminated diffusers

Makram Ibrahim1 and Jun Uozumi2

1National Research Institute of Astronomy and Geophysics (NRIAG), Helwan 11421 Cairo, Egypt

2Faculty of Engineering, Hokkai-Gakuen University, Sapporo, Hokkaido 064-0926, Japan


Three-dimensional correlation properties were studied experimentally for speckled-speckle patterns produced by a rough surface on which the speckle field due to a random fractal object is incident. The speckled speckles observed in some lateral planes with different propagation distances did not exhibit a definite speckle size, having many intensity clusters with various sizes which tend to increase with an increase of the fractal dimension of the fractal object. The fractality across the lateral planes was confirmed by the existence of a power-law behavior in the intensity correlation, and was practically independent of the propagation distance. The longitudinal fractality was also revealed by finding a nearly power-law behavior in the longitudinal intensity correlation. It was shown that the longitudinal fractal dimension was larger than the lateral fractal dimension for each dimension of the fractal object, indicating an anisotropic fractality of the speckle field. © Anita Publications. All rights reserved.

Keywords: Speckled speckle, Fractal speckle, Speckle clustering, Longitudinal correlation, Correlation tail, Power law


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Asian Journal of Physics                                                                                                                Vol. 27 No 8-10, (2018), 00-00

Laser light scattering from rough glass liquid interface:
a case study of screening of adulterated diesel oils

Kai-Erik Peiponen,Boniphace Kanyathare and Benjamin Asamoah

Department of Physics and Mathematics, University of Eastern Finland, P. O. Box 111, FI-80101, Joensuu, Finland


Light scattering is an important phenomenon in various technological applications. For the case of rough glass-liquid interface, it depends on the surface roughness and refractive index mismatch which leads to speckle pattern in the far field region, as well as wetting and variation in the local contact angle. The objective of this work was to study laser light scattering from both rough and smooth glass-liquid interfaces. This was accomplished using a modified handheld gloss meter (portable sensor) which enables recording of time-dependent backscattered laser light (TDBLL) through a software on an integrated laptop. As a feasibility study, authentic and adulterated diesel oils were considered. It is shown that, even though nonzero excess refractive index exists when diesel oils are mixed with kerosene, it has minor role in the dynamic process of liquid spreading. The spreading of liquid as well as excess refractive index depends on the intermolecular interactions which emerges in the measured signals. The different adulterated samples were ordered according to the increase in the volume of the adulterant (kerosene). Hence, the measured TDBLL signals for smooth and rough glass enables distinction between authentic and adulterated diesel oil samples.  © Anita Publications. All rights reserved.

Keywords: Light scattering,Refractive index, Backscattered laser light (TDBLL), Kerosine oil


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Asian Journal of Physics                                                                                                                Vol. 27 No 8-10, (2018), 00-00


Joint transform correlation of compressed digital images

Joewono Widjaja

School of Physics, Suranaree University of Technology

Nakhon Ratchasima, 30000, Thailand


Joint transform correlator (JTC) of digitally compressed images is studied by using low-contrast retinal fundus images. Simulation results show that the JTC has reliable recognition performance even though the compressed retinal images have low contrast and are corrupted by noise. © Anita Publications. All rights reserved.

Keywords: Joint transform correlator (JTC), Real-time JTC, Retinal images, Pixels


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Asian Journal of Physics                                                                                                                Vol. 27 No 8-10, (2018), 00-00

Optimal digitization of one-dimensional dynamic speckle signals for object identification

Takashi Okamoto and Jun Mizobe

Department of Systems Design and Informatics, Kyushu Institute of Technology,
680-4 Kawazu, Iizuka, Fukuoka 820-8502, Japan,


We investigate a method of object identification using dynamic laser speckles to identify scattering objects such as paper or plastic cards. The effects of sampling interval and quantization level of the speckle signals on authentication performance are examined by using the equal error rate (EER) as a measure of the accuracy of object identification. It is observed that a sampling interval of more than the correlation length of speckle fluctuations and a quantization of two or three bits offers the lowest EER for data sizes ranging from 100 to 500 bytes. The optimal quantization bit number is verified by experiments using plastic cards. © Anita Publications. All rights reserved.


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