共查询到20条相似文献,搜索用时 86 毫秒
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奇偶相干迭加态的振幅高次方压缩 总被引:1,自引:0,他引:1
本文引入了学子消灭算符四次方算符α^4新的正交归一本征态:奇偶相干态和奇偶相干迭加态,并研究了奇偶相干迭加态的振幅高次方压缩特性。 相似文献
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把奇偶相干态推广到了非简谐振子的势场中,发现随着平均能量的增加,奇偶广义相干态交替出现压缩现象.在随时间的演化过程中,自然坐标与自然动量的量子起伏产生周期为π/2的压缩
关键词: 相似文献
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压缩奇偶相干态的量子统计性质 总被引:8,自引:2,他引:6
用压缩算子作用在奇偶相干态上即可得到压缩奇偶相干态.本文研究了这类量子态的统计特性.结果表明,压缩奇相干态和压缩偶相干态都能处于压缩状态,它们的光子亦都可能出现反聚束的现象. 相似文献
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奇偶相干态的Wehl商和Shannon熵 总被引:3,自引:0,他引:3
研究了奇、偶相干态的Wehrl熵和Shannon熵、结果表明,其Wehrl熵随总噪声的增加而增大,并趋向同一个常数。Shannon熵随力学量起伏的减小而减小,且这两种态的Shannon熵均可小于相干态的Shannon熵,但这时并不与压缩效应的出现相对应,因而Shannon熵不能成为压缩存在的判据.。 相似文献
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文章给出了q变形的奇偶相干迭加态的表达式,并研究了相应的q变形奇偶相干迭加态光场的N阶压缩效应。 相似文献
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有限维Fock空间谐振子的奇偶相干态的高阶压缩 总被引:1,自引:0,他引:1
针对有限维Fock空间谐振子的奇偶相干态的高阶压缩特性,具体研究了在这种奇偶相干态中正交算符的任意阶压缩性质,研究结果表明,在特定条件下,正交算符在偶相干态中有2N阶压缩,且出现各阶最大压缩的条件完全相同。 相似文献
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奇偶相干态中测量相位算符的涨落及其压缩 总被引:14,自引:0,他引:14
利用Barnett和Pegg提出的测量相位算符讨论了奇偶相干态中的相位涨落及其高阶涨落,在测不准关系和高阶测不准关系基础上给出了测量相位压缩和高阶压缩的二类定义,并用这二类定义研究了奇偶相干态中测量相位的二阶和高阶压缩情况。 相似文献
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构造出了有限维Hilbert空间Roy型奇偶非线性相干态, 讨论了它们的正交归一完备性和振幅平方压缩效应. 研究表明, 在此空间中Roy型奇偶非线性相干态是归一完备的, 但不具有正交性; 当复参数相位角θ满足一定条件时它们存在振幅平方压缩效应, 同时导出了压缩条件与参数s,r以及函数f(n)之间的关系. 最后借助于数值计算, 发现对于5维(或7维)Hilbert空间中Roy型偶(或奇)非线性相干态, 当参数θ和Lamb-Dike参数η取某一给定值时, 在参数r变化的不同取值范围内, 它们均可以呈现振幅平方
关键词:
有限维Hilbert空间
Roy型非线性相干态
奇偶非线性相干态
振幅平方压缩 相似文献
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The Wigner function and the symplectic tomogram of an entangled quantum state, which is a superposition of the photon’s coherent
states (even and odd coherent states), is studied. Photon statistics and violation of Bell’s inequality for the photon state
are discussed. 相似文献
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本文研究介观 Josephson 结与激发偶奇相干态的相互作用。研究了存在非经典光场时介观 Josephson 结中超导电流的一些特性,诸如崩塌与复苏现象,流压台阶特性,直流分量涨落以及超导电流的量子相干等。结果显示,超导电流的涨落及期望值可呈现直流分量。结果还显示稳态超导电流量,超导电流涨落的直流分量以及超导电流直流分量的关联函数等皆与光场的相位有关。 相似文献
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Continuous-variable quantum teleportation of even and odd coherent states through varied gain channels
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This paper has investigated quantum teleportation of even and odd coherent states in
terms of the EPR entanglement states for continuous variables. It discusses the
relationship between the fidelity and the entanglement of EPR states, which is
characterized by the degree of squeezing and the gain of classical channels. It
shows that the quality of teleporting quantum states also depends on the
characteristics of the states themselves. The properties of teleporting even and odd
coherent states at different intensities are investigated. The difference of
teleporting two such kinds of quantum states are analysed based on the quantum
distance function. 相似文献
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A new kind of even and odd nonlinear coherent states (EONLCSs) is introduced. Using the Pegg-Barnett formalism of phase operator we study the phase probability distributions of the new kind of EONLCSs. The numerical computation results show that the phase probability distributions for the new EONLCSs can clearly exhibit the different features of quantum interference and distinct from those of the ordinary even and odd coherent states (EOCSs) and EONLCSs. Based on the phase probability distributions we investigate the phase and number squeezing of the new EONLCSs. It is found that these states exhibit number squeezing for different ranges of the parameter |λ|. 相似文献
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Using the coherent state representation of Wigner operator and the technique of integration within an ordered product (IWOP) of operators, this paper derives the Wigner functions for the photon-depleted even and odd coherent states (PDEOCSs). Moreover, in terms of the Wigner functions with respect to the complex parameter a the nonclassical properties of the PDEOCSs are discussed. The results show that the nonclassicality for the state |β, m〉o (or |β,m〉e) is more pronounced when m is even (or odd). According to the marginal distributions of the Wigner functions, the physical meaning of the Wigner functions is given. Further, the tomograms of the PDEOCSs are calculated with the aid of newly introduced intermediate coordinate-momentum representation in quantum optics. 相似文献