Steering quantum nonlocalities of quantum dot system suffering from decoherence

Yang, Huan; Xing, Ling-Ling; Ding, Zhiyong; Zhang, Gang; Liu, Ye

doi:10.1088/1674-1056/ac615a

Cited by 4 publications

(3 citation statements)

References 76 publications

(82 reference statements)

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“…The l 1 norm of coherence is most effective in witnessing the NAQC, and it can detect more NAQC states. After that, variously paramount efforts have been reported [53][54][55][56][57][58], including the hierarchy between the NAQC and Bell nonlocality [54], the NAQC of high-dimensional system [55], the NAQC under sequential observers [56], the experimental investigation concerning the NAQC [57], and the realizations of the NAQC in a variety of quantum systems [48,[59][60][61][62]. Recently, some novel conclusions have been revealed.…”

Section: Introductionmentioning

confidence: 99%

Suppressing the degeneration of quantum resources through coupling auxiliary qubits

Xing,

Yang,

Kong

et al. 2024

Phys. Scr.

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The nonlocal advantage of quantum coherence (NAQC), quantum coherence (QC), and quantum entanglement are promising quantum resources to achieve various quantum information tasks. However, the decoherence of quantum resource is detrimental to the implementation of quantum information processing, and it brings enormous challenge to the application of quantum resource. Here, consider that Alice and Bob possess a two-qubit X state, and the two-qubit X state is composed of two atoms. Bob’s atom interacts with a reservoir, and Alice’s atom is subjected to the inﬂuence of amplitude damping channel. We design an eﬀective scheme by coupling auxiliary qubits with reservoir, and this scheme can signiﬁcantly suppress the dissipation of the NAQC, QC, and quantum entanglement. The results reveal that the NAQC, QC, and quantum entanglement degenerate with the increase of time t in the strong coupling regime or weak coupling regime when absenting auxiliary qubits. If one adds some auxiliary qubits in the reservoir, these quantum resources can be strengthened both in the strong coupling regime and weak coupling regime. Auxiliary qubits can help us eﬀectively resist the dissipation of these quantum resources. In comparison with the QC and quantum entanglement, the NAQC is most fragile and it is most vulnerable to the inﬂuences of reservoir and noise channel. One needs introduce more auxiliary qubits to suppress the dissipation of the NAQC, especially in the scenarios of the weak coupling regime and strong channel parameter. In this sense, our investigations may provide a potent technique for restraining decoherence and oﬀer a new platform for quantum resource application.

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Section: Introductionmentioning

confidence: 99%

Suppressing the degeneration of quantum resources through coupling auxiliary qubits

Xing,

Yang,

Kong

et al. 2024

Phys. Scr.

Self Cite

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“…This concept, which challenges our common sense, has attracted significant attention in various fields of physics in recent years, both in theoretical analysis and experimental exploration. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Researchers have devised steering inequalities to detect this nonlocal correlation that provides evidence of quantum steering when violated. [18][19][20] Moreover, quantum steering is highly promising in quantum information processing.…”

Section: Introductionmentioning

confidence: 99%

Enhancing quantum temporal steering via frequency modulation

Wu 吴,

Cheng 程

2024

Chinese Phys. B

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Various strategies have been proposed to harness and protect space-like quantum correlations in different models under decoherence. However, little attention has been given to temporal-like correlations, such as quantum temporal steering (TS), in this context. In this work, we investigate TS in a frequency-modulated two-level system coupled to a zero-temperature reservoir in both the weak and strong coupling regimes. We analyze the impact of various frequency-modulated parameters on the behavior of TS and non-Markovian. The results demonstrate that appropriate frequency-modulated parameters can enhance the TS of the two-level system, regardless of whether the system is experiencing Markovian or non-Markovian dynamics. Furthermore, a suitable ratio between modulation strength and frequency (i.e., all zeroes of the 0th Bessel function J 0(δ/Ω)) can significantly enhance TS in the strong coupling regime. These findings indicate that efficient and effective manipulation of quantum TS can be achieved through a frequency-modulated approach.

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“…[3] Recently, examinations of EPR steering in different systems have been conducive to the practical application of EPR steering, and investigations have also helped to recognize the nonclassical traits of various systems, including non-Markovian systems, [17] non-Gaussian spin systems, [18] atom systems, [19] neutrino oscillations [20] and quantum dot systems. [21] In general, experimental realizations are important for theoretical applications in quantum information. For this purpose, relevant explorations of EPR steering have been implemented using various experimental settings.…”

Section: Introductionmentioning

confidence: 99%

Ascertaining the influences of auxiliary qubits on the Einstein–Podolsky–Rosen steering and its directions

Xing 邢,

Yang 杨,

Zhang 张

et al. 2024

Chinese Phys. B

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Einstein-Podolsky-Rosen (EPR) steering is one of nontrivial quantum nonlocalities and characteristics in the non-classical world. The directivity (or asymmetry) is a fascinating trait of the EPR steering, and it is different from other quantum nonlocalities. Here, considering the strategy in which two atoms compose a two-qubit X state, and the two atoms are owned by Alice and Bob, respectively. The atom of Alice suffers from a reservoir, and the atom of Bob couples with a bit flip channel. The influences of auxiliary qubits on the EPR steering and its directions are revealed by means of entropy uncertainty relation. The results indicate that the EPR steering declines with growing time t when adding less auxiliary qubits. The EPR steering behaves as damped oscillation when introducing more auxiliary qubits in the strong coupling regime. In the weak coupling regime, the EPR steering monotonously decreases as t increases when coupling auxiliary qubits. The increases of auxiliary qubits are responsible for the fact that the steerability from Alice to Bob (or from Bob to Alice) can be more effectively revealed. Notably, the introductions of more auxiliary qubits can change the situation that the steerability from Alice to Bob is certain into the situation that the steerability from Bob to Alice is certain.

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Steering quantum nonlocalities of quantum dot system suffering from decoherence

Cited by 4 publications

References 76 publications

Suppressing the degeneration of quantum resources through coupling auxiliary qubits

Suppressing the degeneration of quantum resources through coupling auxiliary qubits

Enhancing quantum temporal steering via frequency modulation

Ascertaining the influences of auxiliary qubits on the Einstein–Podolsky–Rosen steering and its directions

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