共查询到20条相似文献,搜索用时 78 毫秒
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对一类光子消灭算符aN的正交归一本征态的迭加态的振幅k次方压缩特性进行研究,结果表明一类aN的正交归一本征态的迭加态的振幅k次方压缩特性明显地区别于aN的正交归一本征态k次方压缩.无论N取奇数还是偶数迭加态均存在振幅k(k=Nt或Nt/2)次方压缩,当位相差δ=2mπ/t(m为整数)时迭加态不存在振幅k次方压缩;当δ=π时,只有N和t同时为奇数才有可能存在k次方压缩;当δ=π/2时,对应t≠4m的不同取值迭加态存在k次方压缩;因而参量的位相对振幅的k次方压缩起着关键性的作用. 相似文献
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相位差与q变形广义相干叠加态的压缩特性 总被引:1,自引:0,他引:1
对于q变形的非简谐振子广义相干态的叠加态β〉+eiφβeiδ〉,其量子涨落的可能高阶压缩阶数可以表示为k≠2πn/δ,这里n是整数.当δ=π时,压缩阶数不能是偶数即只能是奇数,这正是q变形非简谐振子广义奇偶相干态的结果.由此表明参数相位差δ对决定q变形的非简谐振子广义相干态叠加态的高阶压缩阶数起决定性作用. 相似文献
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由奇偶相干态组成的第ⅣV种四态叠加多模叠加态光场的等阶N次方Y压缩 总被引:11,自引:2,他引:9
根据量子力学中的线性叠加原理,构造了由多模奇相干态和多模虚偶相干态组成的第Ⅳ种四态叠加多模叠加态光场|ψ(4)oe,Ⅳ〉q.利用多模压缩态理论,研究了态|ψ(4)oe,Ⅳ>q的等阶N次方Y压缩特性.结果发现1)当压缩阶数为偶数时,态|(4)oe,Ⅳ〉q始终不呈现等阶N次方Y压缩效应.a)当压缩阶数N=4m(m=1,2,3,……)时,态|ψ(4)oe,Ⅳ〉q恒处于等阶N-Y最小测不准态;b)当N=4m'+2(m'=0,1,2,……)时,态| ψ(4)oe,Ⅳ〉q可呈现"半相干态"效应;2)当压缩阶数为奇数时,在不同的条件下,态|ψ(4)oe,Ⅳ〉q可分别呈现以下几种状态a)第一正交分量可呈现等阶N次方Y压缩效应;b)第二正交分量可呈现等阶N次方Y压缩效应;c)态|ψ(4)oe,Ⅳ>q可呈现"半相干态"效应. 相似文献
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两不同奇相干态组成的第Ⅲ种四态叠加多模叠加态光场的等阶N次方H压缩 总被引:10,自引:3,他引:7
本文构造了由两不同奇相干态组成的第种四态叠加多模叠加态光场|ψo(4),Ⅲ〉q.利用新近建立的多模压缩态理论,详细研究了态|ψo(4),Ⅲ〉q的广义非线性等阶N次方H压缩特性,结果发现由多模奇相干态|ψ,o〉q和多模虚奇相干态|ψi(2),o〉q这两者线性叠加所组成的新量子光场态、|ψo(4),Ⅲ〉q是一种典型的非经典光场.1)当腔模总数q与压缩阶数N的乘积q·N为偶数、且qN=4m(m=1,2,3,…,…)时,态|ψo(4),Ⅲ〉q恒处于等阶N-H最小测不准态,与其它参量的取值无关;2)当qN为偶数、且qN=4m-2(m=1,2,3,…,…)时,(i)态|ψo(4),Ⅲ〉q可呈现等阶N次方H压缩效应,其两正交分量的压缩特性呈现周期性变化的、互补对称关系;(ii)态|ψo(4),Ⅲ〉q可呈现“半相干态”效应.3)当qN为奇数时,态|ψo(4),Ⅲ〉q始终不呈现等阶N次方H压缩效应,也不处于等阶N-H最小测不准态,但在一定条件下可呈现“半相干态”效应. 相似文献
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由奇偶相干态组成的第Ⅳ种四态叠加多模叠加态光场的等阶N次方Y压缩 总被引:4,自引:1,他引:3
根据量子力学中的线性叠加原理 ,构造了由多模奇相干态和多模虚偶相干态组成的第 种四态叠加多模叠加态光场 |Ψ(4)oe , 〉q.利用多模压缩态理论 ,研究了态 |Ψ(4)oe , 〉q的等阶N次方 Y压缩特性 .结果发现 :1 )当压缩阶数为偶数时 ,态 |Ψ(4)oe , 〉q始终不呈现等阶 N次方Y压缩效应 .a)当压缩阶数 N=4m(m=1 ,2 ,3 ,…… )时 ,态 |Ψ(4)oe , 〉q恒处于等阶 N- Y最小测不准态 ;b)当 N=4m′+2 (m′=0 ,1 ,2 ,…… )时 ,态 |Ψ(4)oe , 〉q可呈现“半相干态”效应 ;2 )当压缩阶数为奇数时 ,在不同的条件下 ,态 |Ψ(4)oe , 〉q可分别呈现以下几种状态 :a)第一正交分量可呈现等阶 N次方 Y压缩效应 ;b)第二正交分量可呈现等阶 N次方 Y压缩效应 ;c)态 |Ψ(4)oe , 〉q可呈现“半相干态”效应 . 相似文献
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根据量子力学的线性叠加原理 ,构造了由多模偶相干态与多模虚偶相干态组成的第 种四态叠加多模叠加态光场态 |Ψ(4)e , 〉q的等阶 N次方 Y压缩特性 .结果发现 :1 )当压缩阶数 N=4m,( m=1 ,2 ,3 ,… )时 ,态 |Ψ(4)e , 〉q 恒处于等阶数 N-Y最小测不准态 ;2 )当压缩阶数 N =4m′+2 ,( m′=0 ,1 ,2 ,… )时 ,在 (θ1-θ2 ) ,q,Rj,r1,r2 等取不同的组合定值下 ,态|Ψ(4)e , 〉q可分别呈现出等阶 N次方 Y压缩效应与“半相干态”效应 ;3 )当压缩阶数 N为奇数时 ,在 (θ1-θ2 ) ,q,Rj,r1,r2 等取不同的组合定值下 ,态 |Ψ(4)e , 〉q 可呈现出等阶 N次方 Y压缩效应 相似文献
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根据量子力学的线性叠加原理,构造了由多模偶相干态与多模虚偶相干态组成的第Ⅲ种四态叠加多模叠加态光场态|Ψ(4)e,Ⅲ〉q的等阶N次方Y压缩特性.结果发现:1) 当压缩阶数N=4m,(m=1,2,3,…)时,态|Ψ(4)e,Ⅲ〉q恒处于等阶数N-Y最小测不准态;2) 当压缩阶数N=4m′+2,(m′=0,1,2,…)时,在(θ1-θ2),q,Rj,r1,r2等取不同的组合定值下,态|Ψ(4)e,Ⅲ〉q可分别呈现出等阶N次方Y压缩效应与"半相干态"效应;3) 当压缩阶数N为奇数时,在(θ1-θ2),q,Rj,r1,r2等取不同的组合定值下,态|Ψ(4)e,Ⅲ〉q可呈现出等阶N次方Y压缩效应. 相似文献
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构造了由多模复共轭相干态|{Z*j}〉q、多模复共轭相干态的相反态|{-Z*j}〉q以及多模虚相干态|{iZj}〉q的线性叠加所组成的第Ⅴ类三态叠加多模叠加态光场|ψ(3)5〉q.利用多模压缩态理论研究了态|ψ(3)5〉q中广义磁场分量的等幂次N次方Y压缩特性.结果发现:当压缩次数N=2p且p=2m(m=1,2,3,…,…)时,只要各模的初始相位φj(j=1,2,…,…,q)、态间的初始相位差(θ1-θ2)、(θ1-θ3)和(θ2-θ3)以及受各模的初始相位φj调制的各单模相干态光场的平均光子数之和∑qj=1(R2jcos2φj)等分别满足一定的取值条件,则态|ψ(3)5〉q的广义磁场分量就可呈现出周期性变化的广义非线性等幂次4m次方Y压缩效应. 相似文献
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M.K. Tavassoly 《Optics Communications》2010,283(24):5081-5091
In this paper, using an exponential function of intensity of radiation field, two new classes of nonlinear coherent states will be constructed. For the first class, we choose the nonlinearity function as fβ(n) = exp(βn), where β characterizes the strength of the nonlinearity of the quantum system. We show that, the corresponding β-states possess a collection of non-classicality features, only for the particular values of β and z. But, interestingly there exists finite (threshold) values of β, for which all of the non-classicality signs will disappear, in appropriate regions around the origin of the complex plane (z < |Z|). It is then illustrated that, using this threshold (or greater) value of β, the corresponding β-states behave very similar to canonical coherent states, as the most classical quantum states, in approximately whole of the space. In the continuation, we motivate to find another class of nonlinear coherent states, limited to a unit disk centered at the origin, looking like the canonical coherent states in behavior, in exactly the whole range of |z| < 1. This purpose also will be achieved by considering the nonlinearity function as , where λ is a tunable nonlinearity parameter. The canonical coherent state's aspects of the corresponding λ-states will be refreshed, in particular cases, working with a threshold (or greater) value of λ. 相似文献
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Preparation of multicomponent motional coherent and squeezed coherent states of a trapped ion 总被引:1,自引:0,他引:1 下载免费PDF全文
In this paper, we present a scheme for preparation of multicomponent motional coherent and squeezed coherent states of the quantized centre of mass of an ion trapped in a one-dimensional harmonic potential and driven by two travelling-wave laser beams tuned to the nth red and blue vibrational sidebands, respectively. In addition, our scheme also provides experimental possibility for quantum state engineering. 相似文献
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ZHENG Shi-Biao 《理论物理通讯》2002,38(12)
A scheme is suggested for the generation of multi-atom maximally entangled states with a cavity in a thermalstate. In this scheme several appropriately prepared two-level atoms are simultaneously sent through the nonresonantcavity. We divide the whole atom-cavity interaction time into two equal parts. At the end of the first part a π pulse isapplied to the atoms using a classical field. Then the photon-number-dependent shifts on the atomic states are cancelledand the atomic system finally evolves to a maximally entangled state. 相似文献
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A scheme is proposed to generate arbitrary, discrete
superpostions of squeezed coherent states of the squeezed center of mass of
$N$ trapped ions along a straight line in phase space.
The scheme is based on a
resonant bichromatic excitation of each trapped ion that generates
displacement and squeezing in the vibrational motion conditioned to each
internal state. In this paper, we also show that such a method can be
used for the engineering of motional quantum states. 相似文献
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ZHENGShi-Biao 《理论物理通讯》2002,38(6):663-666
A scheme is suggested for the generation of multi-atom maximally entangled states with a cavity in a thermal state,In this scheme several appropriately prepared two-level atoms are simultaneously sent through the nonresonant cavity.We divide the whole atom-cavity interaction time into two equal parts.At the end of the first part a π pulse is applied to the atome using a classical field.Then the photon-number-dependent shifts on the atomic states are cancelled and the atomic system finally evoloves to a maximally entangled state. 相似文献
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LIU Xiang 《中国物理C(英文版)》2010,34(9)
In my talk,we present the dynamical study of Y(4140)and Y(3930)under the D*s(D)*s and D*(D)*molecular assignments respectively.The importance to theoretically and experimentally study their open-charm decay,hidden-charm decay,radiative decay and double-photon decay is proposed combing with the theoretical calculation of the decay behavior of Y(4140)and Y(3930).According to the recent new experimental progress made by Belle,we further indicate the reasonability of molecular explanation to Y(4140).Another event cluster around 4270 MeV in the J/ψφ invariant mass spectrum of B → KJ/ψφ can provide us more hints to reveal the creation mechanism of molecular structure in B meson decay,which will be helpful to clarify the underlying structure of Y(4140)and Y(3930). 相似文献
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用多步激发的方法,将Sr原子从基态5s~2经价态4α~(-2)激发至(4d_(3/2)np,n_f)J=1和(4d_(5/2)np,nf)J=1自电离系列,观察其在外电场0~5kV/cm内的光谱.对所观察到的n=12,13,14附近的斯塔克谱图进行了分析与讨论. 相似文献
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Cheng Zhang 《Molecular physics》2014,112(9-10):1427-1447
The Mayer sampling method was used to compute the virial coefficients of high-dimensional hard-sphere fluids. The first 64 virial coefficients for dimensions 12 < D ? 100 were obtained to high precision, and several lower dimensional virial coefficients were computed. The radii of convergence of the virial series in 13, 15, 17 and 19 dimensions agreed well with the analytical results from the Percus–Yevick closure. 相似文献