Influence of a Superconducting Lead on Orbital Entanglement Production in Chaotic Cavities

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• 作者：Sergio Rodríguez-Pérez ; Marcel Novaes
• 关键词：Orbital entanglement ; Chaotic cavity ; Superconductor
• 刊名：Brazilian Journal of Physics
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：45
• 期：5
• 页码：532-537
• 全文大小：712 KB
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• 作者单位：Sergio Rodríguez-Pérez (1)
  Marcel Novaes (2)
  
  1. Escola de Ciências e Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, RN, 59072-970, Brazil
  2. Instituto de Física, Universidade Federal de Uberlandia, Uberlandia, MG, 38400-902, Brazil
  
• 刊物类别：Physics and Astronomy
• 出版者：Springer New York
• ISSN：1678-4448

文摘

We study orbital entanglement production in a chaotic cavity connected to four single-channel normal-metal leads and one superconducting lead, assuming the presence of time-reversal symmetry and within a random matrix theory approach. The scattered state of two incident electrons is written as the superposition of several two-outgoing quasi-particle components, four of which are orbitally entangled in a left-right bipartition. We calculate numerically the mean value of the squared norm of each entangled component, as functions of the number of channels in the superconducting lead. Its behavior is explained as resulting from the proximity effect. We also study statistically the amount of entanglement carried by each pair of outgoing quasi-particles. When the influence of the superconductor is more intense, the device works as an entangler of electron-hole pairs, and the average entanglement is found to be considerably larger than that obtained without the superconducting lead. Keywords Orbital entanglement Chaotic cavity Superconductor