Scheme for generation of three-photon entangled W state assisted by cross-Kerr nonlinearity and quantum dot

We represent an optical scheme using cross-Kerr nonlinearities (XKNLs) and quantum dot (QD) within a single-sided optical cavity (QD-cavity system) to generate three-photon entangled W state containing entanglement against loss of one photon of them. To generate W state (three-photon) with robust en...

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Bibliographic Details
Published in:Scientific reports 2019-07, Vol.9 (1), p.10151-15, Article 10151
Main Authors: Heo, Jino, Hong, Changho, Choi, Seong-Gon, Hong, Jong-Phil
Format: Article
Language:English
Subjects:
639/766/400/482
639/766/483/481
Humanities and Social Sciences
multidisciplinary
Nonlinear systems
Photons
Quantum dots
Science
Science (multidisciplinary)
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Summary:We represent an optical scheme using cross-Kerr nonlinearities (XKNLs) and quantum dot (QD) within a single-sided optical cavity (QD-cavity system) to generate three-photon entangled W state containing entanglement against loss of one photon of them. To generate W state (three-photon) with robust entanglement against loss of one photon, we utilize effects of optical nonlinearities in XKNLs (as quantum controlled operations) and QD-cavity system (as a parity operation) with linearly optical devices. In our scheme, the nonlinear (XKNL) gate consists of weak XKNLs, quantum bus beams, and photon-number-resolving measurement to realize controlled-unitary gate between two photons while another nonlinear (QD) gate employs interactions of photons and an electron of QD confined within a single-sided optical cavity for implementation of parity gate. Subsequently, for the efficiency and experimental feasibility of our scheme generating W state, we analyze the immunity of the controlled-unitary gate using XKNLs against decoherence effect and reliable performance of parity gate using QD-cavity system.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-46231-7