Dynamics of super quantum discord and optimal dense coding in quantum channels

Мирмасоуди, Фороузан; Ahadpour, Sodeif

doi:10.1088/1751-8121/aacd29

Cited by 21 publications

(7 citation statements)

References 60 publications

(60 reference statements)

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“…As a result, the communication accomplished under noisy channels may not be trustable because the receiver may obtain partial or degrade information different from the sender's information. Studying how decoherence affects quantum correlations has been investigated in several quantum systems [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The role of noisy channels in quantum teleportation

Ahadpour

Мирмасоуди

2020

Rev. Mex. Fís.

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In quantum information theory, effects of quantum noise on teleportation are undeniable. Hence,we investigate the effect of noisy channels including amplitude damping, phase damping, depolarizing and phase ip on the teleported state between Alice and Bob where they share an entangled state by using atom-eld interaction state. We analyze the delity and quantum correlations as a function of decoherence rates and time scale of a state to be teleported. We observe that the average delityand quantum correlations accurately depend on types of noise acting on quantum channels. It is found that atom-eld interaction states are affected by amplitude damping channel are more useful for teleportation than when the shared qubites are affected by noisy channels such as AD channel and phase ip. We also observe that if the quantum channels is subject to phase ip noise, the average delity reproduces initial quantum correlations to possible values. On the other hand,not only all the noisy quantum channels do not always destroy average delity but also they can yield the highest delity in noisy conditions. In the current demonstration, our results provide that the average delity can have larger than 2/3 in front of the noise of named other channels with increasing decoherenc strength. Success in quantum states transfer in the present noise establishes the important of studing noisy channels.

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Section: Introductionmentioning

confidence: 99%

The role of noisy channels in quantum teleportation

Ahadpour

Мирмасоуди

2020

Rev. Mex. Fís.

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“…In quantum information theory, the entanglement could be considered as a clue role for implementing some quantum information tasks such as quantum cryptography [6], quantum computations, geometric quantum computation [7][8][9], and dense coding [1,10]. In the past few decades, the role of quantum correlations in dense coding and teleportation has attracted considerable attention and expanded multiple approaches not only in theories but also in experiments [11][12][13][14][15][16][17]. Quantum teleportation and dense coding are performing with the help of prior quantum entanglement partaken by the sender and receiver.…”

Section: Introductionmentioning

confidence: 99%

Thermal quantum correlations of spin chain with multiple interactions

Ahadpour

Мирмасоуди

2020

Rev. Mex. Fís.

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In order to explore the impact of distance between spins on quantum correlation, we compute trace ditance discord (TDD) and spin squeezing in an anisotropic Heisenberg XYZ model with Dzyaloshinskii-Moriya interaction in the presence of the external magnetic field. It is valuable to investigate that how we can protect quantum correlations in system when the distance between the spins is promoted. We find that rich Dzyaloshinskii-Moriya interaction and low temperature can be effective for quantum correlations with increasing distance between spins. As, at sufficeintly low temperature In addition, the generated correlated channels are inspected to interchange the information between the system qubits applying the standard dense coding protocol; then, the dense coding capacity of the transmitted information is quantified. It is found that the strength Dzyaloshinskii-Moriya interaction and magnetic field have a great impact on the dynamics of the quantum correlations and, consequently, the quality of the generated channels to exchange the information. Therefore, the effect of Dzyaloshinskii-Moriya interaction for various strengths of temperature needs to be considered to have valid dense coding when distance of spin increases.

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“…Recently weak measurements have been utilized in a new definition of bipartite correlations through weak quantum discord (WQD) [24,25], which is numerically greater than QD, indicating a greater preservation of the bipartite correlations. Since then WQD has attracted interest in various contexts in quantum information processing [26][27][28][29][30]. While projective measurements result in a loss of coherence, the precise relationship between decoherence and measurement needs to be clarified.…”

Section: Introductionmentioning

confidence: 99%

Simulating the effect of weak measurements by a phase damping channel and determining different measures of bipartite correlations in nuclear magnetic resonance

Gautam,

Pande,

Singh

et al. 2020

Preprint

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Quantum discord is a measure based on local projective measurements which captures quantum correlations that go beyond entanglement. A change in the measurement process, achieved by replacing rank-one projectors with a weak positive operator-valued measure (POVM), allows one to define a quantity termed as weak quantum discord. In this work, we experimentally simulate the effect of a weak POVM on a nuclear magnetic resonance quantum information processor. The two-qubit system under investigation is part of a three-qubit system, where one of the qubits is used as an ancillary to implement the phase damping channel. The strength of the weak POVM is controlled by varying the strength of the phase damping channel. We experimentally observed weak discord in two-qubit states and computed a cost function whose purpose is to optimally extract correlations representing the difference between weak and strong quantum discord. The resultant dynamics of the states is investigated as a function of the measurement strength.

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Dynamics of super quantum discord and optimal dense coding in quantum channels

Cited by 21 publications

References 60 publications

The role of noisy channels in quantum teleportation

The role of noisy channels in quantum teleportation

Thermal quantum correlations of spin chain with multiple interactions

Simulating the effect of weak measurements by a phase damping channel and determining different measures of bipartite correlations in nuclear magnetic resonance

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