Dense Coding in Two Kinds of Two-Qubit Spin Squeezing Model

Li, Yongqiang; Zhao, Xiao; Jia, Xiaofang; Gao, Yang

doi:10.1007/s10773-019-04225-1

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…In the literature, several studies have both theoretically proposed and experimentally demonstrated the concept of dense coding (see, e.g., [9][10][11][12][13][14][15][16][17] and references quoted therein). Interestingly, different methods have been presented to protect the quantum advantages of dense coding under decoherence for a relatively long time [18][19][20][21][22][23], such as choosing the proper initial channel state [24,25], employing different configurations for the external noise [26,27], and applying the quantum weak measurement (QWM) operation [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Quantum dense coding with gravitational cat states

Haddadi,

Ghominejad,

Czerwinski

2024

Commun. Theor. Phys.

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A protocol of quantum dense coding with gravitational cat states is proposed. We explore the effects of temperature and system parameters on the dense coding capacity and provide an efficient strategy to preserve the quantum advantage of dense coding for these states. Our results might open new opportunities for secure communication and possibly insights into the fundamental nature of gravity in the context of quantum information processing.

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Section: Introductionmentioning

confidence: 99%

Quantum dense coding with gravitational cat states

Haddadi,

Ghominejad,

Czerwinski

2024

Commun. Theor. Phys.

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“…The dense coding protocol initially proposed by Bennett and Wiesner [67], where the sender can send two bits of classical information to the receiver by transmitting a single-qubit, if they share a two-qubit maximally entangled state. After that, several works on dense coding have been presented theoretically and experimentally [68][69][70][71][72][73][74][75][76][77][78][79][80]. The dense coding capacity (DCC) is a vital parameter to measure the quality of the chosen quantum channel, i.e.…”

Section: Introductionmentioning

confidence: 99%

Exploring entropic uncertainty relation and dense coding capacity in a two-qubit X-state

et al. 2020

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The measurement precision for two incompatible observables in a typical quantum system can be improved by the aid of one particle as a quantum memory. In this work, we study the entropic uncertainty relation in the presence of quantum memory (EUR-QM) and dense coding capacity (DCC) for arbitrary two-qubit X-states, and then we obtain an explicit relationship between the lower bound of the uncertainty and DCC. As an example, we examine the thermal EUR-QM as well as DCC in two kinds of two-qubit spin squeezing models (one-axis twisting model and two-axis counter-twisting model) under an external magnetic field. In the following, we relate EUR-QM to DCC and show analytically that there is an anti-correlated relation between them, and especially in the ground state. Our results show that for both the models, the entropic uncertainty and its bound can be decreased by reinforcing the spin squeezing parameters or decreasing the temperature of the system. Notably, we reveal that the valid dense coding cannot carry out in the one-axis twisting model, nevertheless, if we properly choose the Hamiltonian parameters, the two-axis counter-twisting model not only carries out the valid dense coding but also the optimal dense coding surely can be achieved. Thereby, our observations might offer new insights into quantum measurement precision and the optimal dense coding for the regimes of various solid-state systems.

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Dense Coding in Two Kinds of Two-Qubit Spin Squeezing Model

Cited by 2 publications

References 19 publications

Quantum dense coding with gravitational cat states

Quantum dense coding with gravitational cat states

Exploring entropic uncertainty relation and dense coding capacity in a two-qubit X-state

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