arXiv subjects

Ahmad Salmanogli

Publications and source records attributed to Ahmad Salmanogli.

23 records · Page 2Linked to original sources

arXiv2019

Entanglement Sustainability in Quantum Radar

Quantum radar is generally defined as a detection sensor that utilizes the microwave photons like a classical radar. At the same time, it employs quantum phenomena to improve detection, identification, and resolution capabilities. However, the entanglement is so fragile, unstable, and difficult to create and to preserve for a long time. Also, more importantly, the entangled states have a tendency to leak away as a result of noise. The points mentioned above enforces that the entangled states should be carefully studied at each step of the quantum radar detection processes as follows. Firstly, the creation of the entanglement between microwave and optical photons into the tripartite system is realized. Secondly, the entangled microwave photons are intensified. Thirdly, the intensified photons are propagated into the atmosphere (attenuation medium) and reflected from a target. Finally, the backscattered photons are intensified before the detection. At each step, the parameters related to the real mediums and target material can affect the entangled states to leak away easily. In this article, the entanglement behavior of a designed quantum radar is specifically investigated. In this study, the quantum electrodynamics theory is generally utilized to analyze the quantum radar system to define the parameters influencing the entanglement behavior. The tripartite system dynamics of equations of motions are derived using the quantum canonical conjugate method. The results of simulations indicate that the features of the tripartite system and the amplifier are designed in such a way to lead the detected photons to remain entangled with the optical modes.

quant-ph↗

arXiv2019

Quantum Sensor Duplicating the Robins Procedure

In this article, we design a quantum device to duplicate the Robins procedure. The Robins use a unique method to determine the migratory direction. In the procedure utilized, the important issue is the effect of the geomagnetic field on the magnetic momentum of created radical pairs (triplet-singlet states) dancing with a special frequency. To duplicate the same operational procedure, the quantum sensor consisting of two coincident tripartite systems is designed. Each system is separately excited with the entangled photons (signal and idler) produced through nonlinearity. In a traditional tripartite system, the microwave cavity mode can be non-classically correlated with the optical cavity mode. In this study, however, there are two microwave cavities modes separately affected by the entangled photons, and these modes can be entangled. The entangled microwave photons play the same role that the triplet-singlet state of the electrons have in the Robins operating system. It is the key point that the quantum sensor is deigned to work with, in such a way that the entangled microwave photons can be strongly affected by the applied external magnetic field. In fact, it is the criterion employed by the quantum sensor to sense the magnetic field intensity and the direction. To analyze the system, the canonical conjugate method is introduced to determine the quantum sensor Hamiltonian, and then the dynamics equations of motions are analytically derived using Heisenberg-Langevin equations.

quant-ph↗

arXiv2018

Optical and Microcavity Modes Entanglement by means of Opto-Electronics System

Entanglement between optical mode and microwave mode is a critical issue in illumination systems. Traditionally, optomechanical systems are applied to couple the optical mode to microcavity modes. However, due to some restrictions of this system such as sensitivity to the thermal noise at room temperature, a novel optoelectronic system is designed in this study to fix the recent system problems. Unlike recent optomechanical systems, the optical modes are directly coupled to the microwave cavity through the optoelectronic elements with no need mechanical system. The main objective of this work is to generate the entangled modes at room temperature. For this purpose, we theoretically analyze the dynamics of motion of the optoelectronic system with the Heisenberg-Langevin equations, from which one can calculate the coupling between optical and microcavity modes. The most important feature of this system is the coupling between optical mode and microwave cavity mode, which is done using a photodetector and a Varactor diode. Hence, by controlling the photodetector current (photocurrent), which is dependent on the optical cavity incidence wave and the Varactor diode biased, which is the function of the photocurrent, the coupling between the optical and microcavity mode is fully done. The modeling results show that the coupled modes are entangled at the room temperature with no need to any mechanical parts.

quant-ph↗

arXiv2018

Optical and Microcavity Modes Entanglement by means of Developed Opto-Mechanical System

To improve the performance of the traditional tripartite opto-mechanical system, we design a developed opto-mechanical tripartite system in which all subsystems such as an optical cavity, microresonator, and microcavity modes are coupled directly to each other. This system is analyzed quantum mechanically, and its dynamics of motion is studied by the Heisenberg-Langevin equations. Notably, the originality of this work contributes to embedding the spherical capacitor in the optical cavity where the plasmon-plasmon interaction between capacitor plates manipulates the internal electric field. Therefore, using plasmon-plasmon interaction inside the spherical capacitor, which leads to nonlinearity, causes the contributed polarization function of the plasmonic property. Actually, this plasmonic property manages the spherical capacitance. Although the spherical capacitor is fundamentally dependent on the plasmonic properties caused by the capacitor gap, the spherical capacitor for a design is required to be parallel to the microwave capacitor. The system developed in the present work proved that the stability of the entanglement between optical cavity and microcavity modes toward the temperature changing is dramatically increased; which is the original goal of this study. It is worth mentioning that the environment noise severely restricted the traditional tripartite system operated with a wide bandwidth, hence the present design can efficiently fix this issue.

quant-ph↗

arXiv2018

Raman Modes Non-classicality through Entangled Photons Coupling to Plasmonic Modes

In this article, non-classical properties of Raman modes are investigated. The original goal, actually, is to identify how and by which method we can induce non-classicality in Raman modes. We introduce a plasmonic system in which Raman dye molecules are buried between two shells of the plasmonic materials similar to onion-like core/shell nanoparticle. This system is excited by the entangled photons, followed by analyzing its dynamics of motion using the Heisenberg-Langevin equations by which the time evolution of the signal-idler mode and Raman modes are derived. Interestingly, the entangled photons are coupled to the plasmonic modes which are used to improve the non-classicality. It is shown that the exciting system with the entangled photons lead to inducing the non-classicality in Raman modes and entanglement between them. This behavior is attributed to the non-classicality of input modes that is coupled to the Raman modes considering the correlation between the incident wave frequency and Raman modes frequency. Notably, these quantum properties are dramatically affected by the environment temperature and Raman molecules location around the plasmonic nanoparticles. Modelling results demonstrate that a temperature increase has a drastic effect on system dynamics. Moreover, it is found that the entanglement between modes in system surely is affected by the coupling between the incident modes and plasmonic modes generated by the core/shell nanoparticles. Finally, as an important result, it is revealed that the Raman modes such as stoke and anti-stoke modes show a revival behavior, which is a quantum phenomenon.

quant-ph↗