A study of the efficiency of the class of $W$-states as a quantum channel.pdfVIP

下载本文档

4
0
约1.45万字
约 7页
2017-04-11 发布于江苏
举报
版权申诉

A study of the efficiency of the class of $W$-states as a quantum channel.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

A study of the efficiency of the class of $W$-states as a quantum channel

a r X i v : 0 8 0 3 .0 6 0 7 v 1 [ q u a n t - p h ] 5 M a r 2 0 0 8 A study of the efficiency of the class of W -states as a quantum channel Satyabrata Adhikari?, Sunandan Gangopadhyay S.N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata 700 098, India March 6, 2008 Abstract Recently, a new class of W -states has been defined by Agarwal and Pati [23] and it has been shown that they can be used as a quantum channel for teleportation and superdense coding. In this work, we identify those three-qubit states from the set of the new class of W -states which are most efficient or suitable for quantum tele- portation. We show that with some probability |W1〉 = 12 (|100〉+ |010〉+ √ 2|001〉) is best suited for teleportation channel in the sense that it does not depend on the input state. PACS Numbers: 03.67.-a, 03.65.Bz,42.50.Dv Quantum teleportation [1] involves the transmission of an arbitrary qubit from one party to another distant party by sending two classical bits. However they must ini- tially share one entangled state. It can also be combined with other operations to construct advanced quantum circuits useful for information processing [2]. The first experimental demonstration of quantum teleportation was reported by Bouwmeester et.al. [3]. Quantum teleportation is also possible in systems corresponding to infinite dimensional Hilbert spaces [5, 6, 7, 8, 9, 10, 11]. The teleportation of quantum entanglement is also known as entanglement swapping [29, 30, 2, 4]. It enables two parties (having no common past) to share quantum en- tanglement. This protocol may be useful in making nonlocal correlations over long distances. Therefore it can play a significant role in quantum communication. Quantum entanglement [12], the heart of quantum information theory, plays a crucial role in computational and communicational purposes. Therefore as a valuable resource in quantum information processing, quantum entanglement has been widely used in quantum cryptography