Quantum coherence induced by a flux qubit coupled by a resonator coherent field through a two-photon interaction

2021 ◽  
Author(s):  
Abdel-Baset Mohamed ◽  
Hosny A Hessian ◽  
F. S. Al-Duais ◽  
H Eleuch
Keyword(s):  
Sudden Death ◽  
Coherent States ◽  
Quantum Coherence ◽  
Intrinsic Decoherence ◽  
Photon Interaction ◽  
Two Photon ◽  
Coherent Field ◽  
Flux Qubit

Abstract The intrinsic decoherence effects on a flux qubit coupled to a resonator through a two-photon interaction where the resonator field is initially in coherent and even coherent states are investigated. The qubit-resonator entanglement and coherence loss (mixedness) of the system and its subsystems are examined using entropy and negativity. The ability of the qubit-resonator interaction to generate quantum coherence (qubit-resonator entanglement and the mixedness) is shown to be dependent on the initial cavity non-classicality, detuning, and decoherence. For larger values of the qubit-resonator detuning, the initial resonator non-classicality can enhance the generation and stability of quantum coherence. The decoherence degrades the qubit-resonator entanglement and destroys the sudden death-birth entanglement.

scholarly journals Two-Qubit Local Fisher Information Correlation beyond Entanglement in a Nonlinear Generalized Cavity with an Intrinsic Decoherence

Entropy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 311
Author(s):  
A.-B. A. Mohamed ◽  
E. M. Khalil ◽  
M. F. Yassen ◽  
H. Eleuch
Keyword(s):  
Hamiltonian System ◽  
Fisher Information ◽  
Coherent States ◽  
Quantum Fisher Information ◽  
Cavity Field ◽  
Intrinsic Decoherence ◽  
Coherent Field ◽  
Generalized Coherent States ◽  
Local Quantum ◽  
Bures Distance

In this paper, we study a Hamiltonian system constituted by two coupled two-level atoms (qubits) interacting with a nonlinear generalized cavity field. The nonclassical two-qubit correlation dynamics are investigated using Bures distance entanglement and local quantum Fisher information under the influences of intrinsic decoherence and qubit–qubit interaction. The effects of the superposition of two identical generalized coherent states and the initial coherent field intensity on the generated two-qubit correlations are investigated. Entanglement of sudden death and sudden birth of the Bures distance entanglement as well as the sudden changes in local Fisher information are observed. We show that the robustness, against decoherence, of the generated two-qubit correlations can be controlled by qubit–qubit coupling and the initial coherent cavity states.

scholarly journals Nonlinear Dynamics of a Cavity Containing a Two-Mode Coherent Field Interacting with Two-Level Atomic Systems

2020 ◽  
Vol 10 (20) ◽  
pp. 7150
Author(s):  
E. M. Khalil ◽  
Hashim M. Alshehri ◽  
A.-B. A. Mohamed ◽  
S. Abdel-Khalek ◽  
A.-S. F. Obada
Keyword(s):  
Quantum Coherence ◽  
Intrinsic Noise ◽  
Noise Model ◽  
Atomic Systems ◽  
Dipole Coupling ◽  
Two Photon ◽  
Dipole Interactions ◽  
Coherent Field ◽  
Noise Rate ◽  
Sudden Appearance

This study analytically explored two coupled two-level atomic systems (TLAS) as two qubits interacting with two modes of an electromagnetic field (EMF) cavity via two-photon transitions in the presence of dipole–dipole interactions between the atoms and intrinsic damping. Using special unitary su(1,1) Lie algebra, the general solution of an intrinsic noise model is obtained when an EMF is initially in a generalized coherent state. We investigated the population inversion of two TLAS and the generated quantum coherence of some partitions (including the EMF, two TLAS, and TLAS–EMF). It is possible to generate quantum coherence (mixedness and entanglement) from the initial pure state. The robustness of the quantum coherence produced and the sudden appearance and disappearance of coherence depended not only on dipole–dipole coupling but also on the intrinsic noise rate. The growth of mixedness and entanglement may be enhanced by increasing dipole–dipole coupling, leading to more robustness against intrinsic noise.

Single-mode and two-mode squeezing in the three-level atom

1992 ◽  
Vol 70 (5) ◽  
pp. 379-382
Author(s):  
A. M. Abdel-Hafez
Keyword(s):  
Coherent States ◽  
Single Mode ◽  
Photon Interaction ◽  
Two Photon ◽  
Level Atom ◽  
The One ◽  
Photon Interactions

We investigate the phenomena of single-mode and two-mode squeezing for a three-level atom and two modes. The field modes are initially taken in coherent states. The effects of detuning on these phenomena are studied for one-photon and two-photon interactions. The relation between the collapse and revival phenomena and single-mode and two-mode squeezing is shown. It is found that the two-mode squeezing is much more effective than the single-mode squeezing for the one-photon interaction. While for the two-photon interaction the reverse is true.

INTERACTION OF MESOSCOPIC JOSEPHSON JUNCTION WITH A SUCCESSIVE SQUEEZED COHERENT FIELD

2000 ◽  
Vol 14 (16) ◽  
pp. 609-618
Author(s):  
V. A. POPESCU
Keyword(s):  
Coherent State ◽  
Josephson Junction ◽  
Coherent States ◽  
Quantum Noise ◽  
Shapiro Steps ◽  
Superconducting Ring ◽  
Coherent Field ◽  
Current Voltage ◽  
Quantum Current ◽  
The Difference

Signal-to-quantum noise ratio for quantum current in mesoscopic Josephson junction of a circular superconducting ring can be improved if the electromagnetic field is in a successive squeezed coherent state. The mesoscopic Josephson junctions can feel the difference between the successive squeezed coherent states and other types of squeezed coherent states because their current–voltage Shapiro steps are different. We compare our method with another procedure for superposition of two squeezed coherent states (a squeezed even coherent state) and consider the effect of different large inductances on the supercurrent.

Effective two-photon interaction in two-resonator circuit QED system

2018 ◽  
Vol 15 (12) ◽  
pp. 125204
Author(s):  
Haiming Yuan ◽  
Chunfeng Wu ◽  
Decun Li ◽  
Mei Li ◽  
Xun-Li Feng ◽  
...  
Keyword(s):  
Circuit Qed ◽  
Photon Interaction ◽  
Two Photon

Entanglement sudden death via two-photon processes in cavity QED

2009 ◽  
Vol 42 (19) ◽  
pp. 195507 ◽  
Author(s):  
W B Cardoso ◽  
A T Avelar ◽  
B Baseia ◽  
N G de Almeida
Keyword(s):  
Sudden Death ◽  
Cavity Qed ◽  
Entanglement Sudden Death ◽  
Two Photon

An Exhaustive Analysis of the Characterization of Photopolymer Material (SZ2080) by Two-Photon Polymerization, Waves Moving in a Periodic Potential, and Two-Photon Absorption

2020 ◽  
Vol 1003 ◽  
pp. 165-172 ◽  
Author(s):  
Ritu Walia ◽  
Kamal Nain Chopra
Keyword(s):  
Photonic Crystals ◽  
Quantum Coherence ◽  
Periodic Potential ◽  
Three Dimensional ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Polymerization Waves ◽  
Two Photon Polymerization

This paper presents an Exhaustive Analysis of the Characterization of Photopolymer Material (SZ2080) by Two-Photon Polymerization, and some of the modern concepts like Characterization of Photonic Crystals in Photopolymer SZ2080 by Two-Photon Polymerization, Waves Moving in a Periodic Potential, and Optical Quantum metamaterials. Two-photon polymerization for fabricating three-dimensional subdiffraction-limited structures has been discussed. Experimental and Computed Curves of line thickness (nm) vs feed rate (μm/s) have been technically analyzed. Waves moving in a Periodic Potential and Photonic Crystals have been technically discussed. In addition, Optical Quantum metamaterials have been discussed in terms of quantum coherence, and quantum dots with emphasis on cavity array metamaterial.

scholarly journals Influence of the Coupling between Two Qubits in an Open Coherent Cavity: Nonclassical Information via Quasi-Probability Distributions

Entropy ◽  
2019 ◽  
Vol 21 (12) ◽  
pp. 1137 ◽  
Author(s):  
Abdel-Baset A. Mohamed ◽  
Hichem Eleuch ◽  
Abdel-Shafy F. Obada
Keyword(s):  
Quantum Coherence ◽  
Probability Distributions ◽  
Microwave Cavity ◽  
Wehrl Entropy ◽  
Intrinsic Decoherence ◽  
Probability Functions ◽  
Decoherence Rate ◽  
Two Level Systems ◽  
Q Function ◽  
Nonclassical Information

In this paper, we investigate the dynamics of two coupled two-level systems (or qubits) that are resonantly interacting with a microwave cavity. We examine the effects of the intrinsic decoherence rate and the coupling between the two qubits on the non-classicality of different system partitions via quasi-probability functions. New definitions for the partial Q-function and its Wehrl entropy are used to investigate the information and the quantum coherence of the phase space. The amount of the quantum coherence and non-classicality can be appropriately tuned by suitably adopting the rates of the intrinsic-decoherence and the coupling between the two qubits. The intrinsic decoherence has a pronounced effect on the negativity and the positivity of the Wigner function. The coupling between the two qubits can control the negativity and positivity of the quasi-probability functions.

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