Protecting free-entangled and bound-entangled states in a two-qutrit system under decoherence using weak measurements

Liao, Xiang-Ping; Mao-Fa, Fang; Man-sheng, Rong; Zhou, Xin

doi:10.1080/09500340.2016.1271149

Cited by 2 publications

(1 citation statement)

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“…Given the availability of fullfledged separability criteria for pure as well as mixed state qubit-qutrit systems, experimental feasibility of state preparation, and the significance of higher-dimensional systems in QIP, they become an important architecture towards understanding and controlling the effects of decoherence in higher-dimensional systems. Some attempts have been made to locally manipulate the disentanglement dynamics in qubit-qutrit [39,40], and qutrit-qutrit [41][42][43] systems to retain the entanglement for longer duration. It is found that the quantum interference between two upper levels of the qutrit can also be used to control the disentanglement dynamics in higher-dimensional systems [39,44].…”

Section: Introductionmentioning

confidence: 99%

Entanglement protection in higher-dimensional systems

Singh¹,

Sinha²

2022

Phys. Scr.

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The inevitable dissipative interaction of an entangled quantum system with its environment causes degradation in quantum correlations present in the system. This can lead to a finite-time disappearance of entanglement, which is known as Entanglement Sudden Death (ESD). Here, we consider an initially entangled qubit-qutrit system and a dissipative noise which leads to ESD, and propose a set of local unitary operations, which when applied on the qubit, qutrit, or both subsystems during the decoherence process, cause ESD to be hastened, delayed, or avoided altogether, depending on its time of application. Delay and avoidance of ESD may find practical application in quantum information processing protocols that would otherwise suffer due to short lifetime of entanglement. The physical implementation of these local unitaries is discussed in the context of an atomic system. The simulation results of such ESD manipulations are presented for two different classes of initially entangled qubit-qutrit systems. A prescription for generalization of this scheme to a qutrit-qutrit system is given. This technique for entanglement protection in the noisy environment is compared with other related techniques such as weak measurement reversal, dynamic decoupling, and quantum Zeno effect.

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