Quantum entanglement, a key resource in quantum information processing, is reduced by interaction between the system concerned and its unavoidable noisy environment. Therefore it of particular importance to study dynamical properties entanglement open systems. In this work, we mainly focus on two qubits coupled an adjustable environment, namely semi-infinite transmission line. The qubits’ relax...

A coupled-line circuit structure is proposed in this paper to design a modified Schiffman phase shifter with short reference line. Based on the traditional transmission line theory and ABCD parameters, closed-form mathematical equations for electrical and scattering parameters are obtained. Obviously, this proposed coupled-line phase shifter has several advantages such as arbitrary phase differ...

Time domain reflectometry (TDR) is a measurement technique based upon transmission line theory. The solutions of transmission line equations are reformulated in terms of independent physical properties, instead of coupled per-unit-length circuit parameters. The complete TDR response is effectively modeled by a non-uniform transmission line using the non-recursive ABCD matrix approach. Approache...

A unequal Wilkinson power divider based on asymmetrical coupled line section is presented in this paper. The proposed unequal Wilkinson power divider topology uses asymmetrical coupled-line section and two transmission-line transformers. For simplification, a section asymmetrical coupled line is applied to obtain front compact matching structure. For generalization, three ports terminated imped...

this paper proposes a new method for transmission loss allocation. the share of each bus in the transmission line losses is determined using transmission line loss equations with respect to bus-injected currents. then, it is applied to the total network transmission lines. in the proposed method, comparing with other methods, a solution to remove the negative loss allocation has been introduced...

To fully evaluate the potential of MIMO technology in power line communication, the channel properties should be thoroughly analyzed. In this paper, efficacy of MIMO technology is studied the Indian residences. For this, the frequency response of the channel, the stationary noise and the Impulsive noise are extensively measured. The frequency response is modeled using the multi-conductor transm...

Since past investigations have shown that radio frequency (RF) signal transmission in the bore of a railgun can be practical, the feasibility of using time domain reflectometry and well-established transmission line theory is investigated as a means to determine armature position during launch. This report describes the transmission line model of the HEMCL and initial measurements suggesting th...

Grounded guard tracks placed adjacent to transmission line interconnects can change their impedance significantly. We report closed-form expressions for line capacitance and impedance of transmission line interconnects with adjacent guard tracks. Results are validated by finite-difference time-domain (FDTD) simulations and measurements. The proposed results can have significant impact on the an...