Efficacy of Moriya interaction to free the bound entangled state

Sharma, Kapil K.; Sinha, Suprabhat; Chandra, Krishna

doi:10.1007/s11128-021-03383-8

Cited by 3 publications

(2 citation statements)

References 47 publications

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“…Some recent studies found that bound entangled states can be used in quantum information theory with some free entanglement [18][19][20][21]. After that, a variety of research works have been conducted on dynamical analysis, distillation, and activation of bound entangled states [22][23][24][25][26]. These research works involve a variety of methods for detecting and measuring entanglements.…”

Section: Introductionmentioning

confidence: 99%

Effect of quantum information scrambling on bound entangled states

Sinha

2024

Phys. Scr.

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Spreading information in physical systems is a common phenomenon. However, when the information is quantum in nature, tracking, describing, and quantifying the information is a challenging task. Quantum information scrambling defines the quantum information propagating chaotically over the physical system. This article describes the effect of quantum information scrambling on bound entangled states. A bound entangled state is a particular type of entangled state that carries noisy entanglement. The distillation of this type of entangled state is very difficult. In recent times, the usefulness of these states has been depicted in different applications. The outcome of this study exhibits that quantum information scrambling develops entanglement in the separable portion of the bound entangled states. Although quantum information scrambling reduces entanglement, the study pointed out that quantum information scrambling plays a significant role in activating the bound entangled states by introducing a certain amount of approximately stable entanglement.

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Section: Introductionmentioning

confidence: 99%

Effect of quantum information scrambling on bound entangled states

Sinha

2024

Phys. Scr.

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“…For qubits interacting directly or indirectly through ancillary qubits, strategies were designed to liberate BE [5][6][7]. Limited to local operations and classical communications (LOCC), though, one way to benefit from BE systems is to find particular tasks impossible to realize with separable systems yet not requiring free entanglement, such as powering up quantum heat engines [8], distilling private keys for QKD [9], converting pure states shared between distant parties [10], and quantum metrology [11].…”

Section: Introductionmentioning

confidence: 99%

Superactivating Bound Entanglement in Quantum Networks via Quantum Zeno Dynamics and a Novel Algorithm for Optimized Zeno Evolution

et al. 2023

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An arbitrary amount of entanglement shared among nodes of a quantum network might be nondistillable if the nodes lack the information on the entangled Bell pairs they share. Making such a system distillable, which is called the superactivation of bound entanglement (BE), was shown to be possible through systematic quantum teleportation between the nodes, requiring the implementation of controlled-gates scaling with the number of nodes. In this work, we show in two scenarios that the superactivation of BE is possible if nodes implement the proposed local quantum Zeno strategies based on only single qubit rotations and simple threshold measurements. In the first scenario we consider, we obtain a two-qubit distillable entanglement system as in the original superactivation proposal. In the second scenario, we show that superactivation can be achieved among the entire network of eight qubits in five nodes. In addition to obtaining all-particle distillable entanglement, the overall entanglement of the system in terms of the sum of bipartite cuts is increased. We also design a general algorithm with variable greediness for optimizing the QZD evolution tasks. Implementing our algorithm for the second scenario, we show that a significant improvement can be obtained by driving the initial BE system into a maximally entangled state. We believe our work contributes to quantum technologies from both practical and fundamental perspectives bridging nonlocality, bound entanglement and the quantum Zeno dynamics among a quantum network.

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Comparative Dynamical Study of a Bound Entangled State

Sinha

2022

Int J Theor Phys

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Efficacy of Moriya interaction to free the bound entangled state

Cited by 3 publications

References 47 publications

Effect of quantum information scrambling on bound entangled states

Effect of quantum information scrambling on bound entangled states

Superactivating Bound Entanglement in Quantum Networks via Quantum Zeno Dynamics and a Novel Algorithm for Optimized Zeno Evolution

Comparative Dynamical Study of a Bound Entangled State

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