scholarly journals The study of entropy in a transmission line resonator interacting with a capacitively coupled Cooper pair box

2019 ◽  
Vol 11 (3) ◽  
pp. 66
Author(s):  
Clodoaldo Valverde ◽  
Basilio Baseia
Keyword(s):  
Transmission Line ◽  
Cooper Pair ◽  
Capacitively Coupled ◽  
One Dimensional ◽  
Cooper Pair Box ◽  
Transmission Line Resonator ◽  
System Entropy ◽  
Control Variation ◽  
Important Indication

In the present work, we theoretically study the entropy of a Cooper pair box coupled to a one-dimensional transmission line resonator. The proposed scheme uses the Jaynes-Cummings model in presence of losses to study the time avolution of the system entropy. The coupling of these two subsystems provides an important indication of the influence of Cooper pair box on the evolution of system entropy. Decaying CPB allows us to control variation of entropy at certain times.

GENERATING QUANTUM ENTANGLEMENT IN SCALABLE SUPERCONDUCTING CHARGE QUBITS

2007 ◽  
Vol 05 (06) ◽  
pp. 829-836 ◽  
Author(s):  
WEN YI HUO ◽  
GUI LU LONG
Keyword(s):  
Transmission Line ◽  
Quantum Entanglement ◽  
Gate Voltage ◽  
Charge Qubit ◽  
One Dimensional ◽  
W States ◽  
Transmission Line Resonator ◽  
Efficient Scheme ◽  
Data Bus ◽  
Charge Qubits

We propose an efficient scheme to generate quantum entanglement in scalable superconducting charge qubits with a one-dimensional superconducting transmission line resonator (STLR) as data bus. The coupling between qubit and data bus may be turned on and off by controlling the DC gate voltage and externally applied flux of the superconducting charge qubit. In our proposal, the entanglement between two arbitrary qubits and W states of three qubits can be generated quickly and easily.

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

scholarly journals Electric Aharonov–Bohm effect without a loop in a Cooper pair box

2018 ◽  
Vol 20 (10) ◽  
pp. 103046
Author(s):  
Young-Wan Kim ◽  
Kicheon Kang
Keyword(s):  
Cooper Pair ◽  
Cooper Pair Box ◽  
Bohm Effect ◽  
Aharonov Bohm
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