Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6717
Title: Manipulation of entanglement sudden death in an all-optical setup
Authors: Singh, Ashutosh
Pradyumna, Siva
Rau, A.R.P.
Sinha, Urbasi
Keywords: Quantum information and processing
Issue Date: Mar-2017
Publisher: Optical Society of America
Citation: Journal of the Optical Society of America B, 2017, Vol. 34, p681
Abstract: The unavoidable and irreversible interaction between an entangled quantum system and its environment causes decoherence of the individual qubits as well as degradation of the entanglement between them. Entanglement sudden death (ESD) is the phenomenon wherein disentanglement happens in finite time even when individual qubits decohere only asymptotically in time due to noise. Prolonging the entanglement is essential for the practical realization of entanglement-based quantum information and computation protocols. For this purpose, the local NOT operation in the computational basis on one or both qubits has been proposed. Here, we formulate an all-optical experimental setup involving such NOT operations that can hasten, delay, or completely avert ESD, all depending on when it is applied during the process of decoherence. Analytical expressions for these are derived in terms of parameters of the initial state’s density matrix, whether for pure or mixed entangled states. After a discussion of the schematics of the experiment, the problem is theoretically analyzed, and simulation results of such manipulations of ESD are presented.
Description: Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI: http://hdl.handle.net/2289/6717
ISSN: 1520-8540 (online)
0740-3224
Alternative Location: http://arxiv.org/abs/1703.01159
http://dx.doi.org/10.1364/JOSAB.34.000681
Copyright: 2017 Optical Society of America
Appears in Collections:Research Papers (LAMP)

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