arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0901.3193quant-ph
收藏

高阶非经典性的广义结构

Generalized structure of higher order nonclassicality

Amit Verma, Anirban Pathak

摘要:

引入了高阶非经典性的广义概念(用高阶矩表示)。在此广义高阶非经典性框架下,导出了高阶压缩和高阶亚泊松光子统计的条件。在此框架下,利用我们在[J. Phys. A. 33(2000)5607]。它也推广到多光子玻色算子的Brandt和Greenberg。类似地,利用数的高次幂算符的正规序导出了高阶次泊松光子统计的条件。进一步,借助于简单的密度矩阵,证明了高阶反聚束(HOA)和高阶次泊松光子统计(HOSPS)不是同一现象的表现,因而用高阶反聚束条件作为HOSPS的检验是不正确的.它还表明,HOA和HOSPS可能存在,即使在相应的低阶现象的情况下。以二项式态、非线性一阶激发压缩态(NLESS)和非线性真空压缩态(NLVSS)作为量子态的例子,指出这些态可能具有高阶非经典特性。观察到总是反聚束的二项式态并不总是高阶压缩的,而表现出高阶压缩的NLVSS态并不表现出HOSPS和HOA。在NLESS中观察到相反的情况,因此确定HOSPS和HOS是两个独立的高阶非经典签名

英文摘要:

A generalized notion of higher order nonclassicality (in terms of higher order moments) is introduced. Under this generalized framework of higher order nonclassicality, conditions of higher order squeezing and higher order subpoissonian photon statistics are derived. A simpler form of the Hong-Mandel higher order squeezing criterion is derived under this framework by using an operator ordering theorem introduced by us in [J. Phys. A. 33 (2000) 5607]. It is also generalized for multi-photon Bose operators of Brandt and Greenberg. Similarly, condition for higher order subpoissonian photon statistics is derived by normal ordering of higher powers of number operator. Further, with the help of simple density matrices, it is shown that the higher order antibunching (HOA) and higher order subpoissonian photon statistics (HOSPS) are not the manifestation of the same phenomenon and consequently it is incorrect to use the condition of HOA as a test of HOSPS. It is also shown that the HOA and HOSPS may exist even in absence of the corresponding lower order phenomenon. Binomial state, nonlinear first order excited squeezed state (NLESS) and nonlinear vacuum squeezed state (NLVSS) are used as examples of quantum state and it is shown that these states may show higher order nonclssical characteristics. It is observed that the Binomial state which is always antibunched, is not always higher order squeezed and NLVSS which shows higher order squeezing does not show HOSPS and HOA. The opposite is observed in NLESS and consequently it is established that the HOSPS and HOS are two independent signatures of higher order nonclassicality

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑