Title:	Entanglement protection in higher-dimensional systems
Authors:	Singh, Ashutosh Sinha, Urbasi
Issue Date:	28-Jul-2022
Publisher:	IOP Publishing for the Royal Swedish Academy
Citation:	Physica Scripta, 2022, Vol.97, p085104
Abstract:	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.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/7977
ISSN:	1402-4896 (Online) 0031-8949
Alternative Location:	https://arxiv.org/abs/2001.07604 https://doi.org/10.1088/1402-4896/ac8200 https://ui.adsabs.harvard.edu/abs/2020arXiv200107604S/abstract
Copyright:	2022 IOP Publishng Ltd
Appears in Collections:	Research Papers (LAMP)

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