Dynamics of Bloch vectors and channel capacity of two non-identical charge qubits

Metwally, N.; Abdel‐Aty, Mahmoud; Obada, A.‐S. F.

doi:10.1016/j.physleta.2009.01.017

Cited by 5 publications

(6 citation statements)

References 38 publications

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“…↓ is also a 3 × 3 matrix whose elements can be obtained from (11). The degree of entanglement is defined as in [14,15] where…”

Section: Dynamics Of Entanglementmentioning

confidence: 99%

Dynamics of Information in the Presence of Deformation

Metwally

2011

Int. J. Quantum Inform.

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The entanglement of atomic system consisting of two atoms interacting with a deformed cavity mode is quanti¯ed by the means of Bloch vectors and the cross dyadic of the traveling state inside the cavity. For large value of the deformation, the amplitude of Bloch vectors decrease very fast and consequently, the traveling state turns into mixed state quickly. The generated entangled state is used as quantum channel to implement quantum teleportation protocol. It is shown that both the deformed parameter and the number of photons inside the cavity play a central role in controlling the¯delity of the transmitted information.

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“…↓ is also a 3 × 3 matrix whose elements can be obtained from (11). The degree of entanglement is defined as in [14,15] where…”

Section: Dynamics Of Entanglementmentioning

confidence: 99%

Dynamics of Information in the Presence of Deformation

Metwally

2011

Int. J. Quantum Inform.

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“…Quantifying the quantum and classical channel capacity in the presence of a decoherence environment induced by spin-chain state vectors is discussed in [7][8][9]. The dynamics of quantum and classical capacity of a system that consists of two superconducting charge qubits were investigated by Metwally [10]. Recently a new protocol was proposed to test the performance for storing and transmitting quantum information by estimating the lower bound on the QCC, even when there are arbitrarily correlated errors [11].…”

Section: Introductionmentioning

confidence: 99%

Restraining the decoherence of accelerated qubit–qutrit system via local Markovian channels

Abd‐Rabbou¹,

Metwally²,

Obada³

et al. 2019

Phys. Scr.

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The effects of noisy channels on the quantum Fisher information, channel capacity and non-local information of an accelerated qubit–qutrit system are discussed. Different phenomena are predicted for all these physical quantities, namely sudden/gradual and frozen behaviors. It is shown that the channel strength plays the central role in frozen behavior for all the noisy channels considered. The decay/increase rate depends on which subsystem is accelerated (qubit or qutrit). The frozen areas of these quantities are depicted at different ranges of channel strength and initial input. The maximum/minimum bounds of the estimation degree of the considered quantities depend on the used noisy channel and the dimensions of the accelerated subsystem.

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“…[14] The channel capacity of coding information of two non-identical charge qubits and the accelerated frame has been investigated. [15,16] On the other hand, for two incompatible observables of position and momentum, Heisenberg has been proposed the uncertainty relation. [17] The average of two observables P, Q commutator represents the bounded below of quantum uncertainties for a quantum state 𝜌, which reads △(P, 𝜌).…”

Section: Introductionmentioning

confidence: 99%

“…[ 14 ] The channel capacity of coding information of two non‐identical charge qubits and the accelerated frame has been investigated. [ 15,16 ]…”

Section: Introductionmentioning

confidence: 99%

Dense Coding and Quantum Memory Assisted Entropic Uncertainty Relations in a Two‐Qubit State Influenced by Dipole and Symmetric Cross Interactions

Abd‐Rabbou

Khalil

2022

Annalen der Physik

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Optimal dense coding and entropic uncertainty relation of quantum memory (EUR‐QM) of the two‐qubit Heisenberg chain model influenced by atomic dipole and Kaplan–Shekhtman–Entin–Wohlman–Aharony interactions are studied. The temporal evolution of the two functions at the phase decoherence environment with the Werner state as the initial state is discussed. The results imply that the dense coding and EUR‐QM have a contrary relationship, and an increase in the phase decoherence rate reduces the behavior of the two functions. The growth in coupling dipole interaction plays a role in oscillating and increasing the minimum bounds of the dense coding capacity. On the other hand, the effect of a thermal bath on the two functions at finite temperatures is investigated. The coding capacity suffers from sudden death as the temperature increases. The possibility of restraining the sudden death induced by the temperature may be enhanced by increasing the strength of the symmetric cross interaction. As the coupling of dipole increases, the EUR‐QM decreases while the coding capacity rises to its maximum value.

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Dynamics of Bloch vectors and channel capacity of two non-identical charge qubits

Cited by 5 publications

References 38 publications

Dynamics of Information in the Presence of Deformation

Dynamics of Information in the Presence of Deformation

Restraining the decoherence of accelerated qubit–qutrit system via local Markovian channels

Dense Coding and Quantum Memory Assisted Entropic Uncertainty Relations in a Two‐Qubit State Influenced by Dipole and Symmetric Cross Interactions

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