The High-order Squeezing of Orthonormalization Eigenstates of a~4

ＴｈｅＨｉｇｈ┐ｏｒｄｅｒＳｑｕｅｚｉｎｇｏｆＯｒｔｈｏｎｏｒｍａｌｉｚａｔｉｏｎＥｉｇｅｎｓｔａｔｅｓｏｆａ４ＭＡＡｉｑｕｎ（ＨａｒｂｉｎＣｏｌｅｇｅ，Ｈａｒｂｉｎ，１５００２０，Ｃｈｉｎａ）ＭＡＺｈｉｍｉｎ（ＳｕｉｈｕａＴｅａｃｈｅｒｓ＇Ｃｏｌ...     

非简谐振子湮没算符高次幂的本征态及其高阶压缩性质

构造出了非简谐振子湮没算符N次幂(N≥3)的N正交归一本征态,并且研究了它们的数学性质及其高次方压缩特性.其结果表明,它们能组成一个完备的希尔伯特(Hibert)空间;且当N为偶数时,这些本征态均可呈现M次方压缩效应[M=(n 1/2)N,n=0,1,2,…]     

一类本征态迭加的高次压缩特性

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.     

双参数形变谐振子湮没算符高次幂本征态的量子统计性质

研究双参数形变谐振子湮没算符高次幂本征态的量子统计特性. 结果表明, 当k为偶数时它们都可存在N次方压缩; 并且它们均可呈现反聚束效应.     

算符a^K本征态热迭加光场的光子数统计分布

利用密度矩阵方法，导出了光子湮没算符高次幂ａ＾Ｋ（ｋ≥２）本征态热迭加光场光子数统计分布的一般表达式，讨论了热噪声对非经典光场态光数统计分布振荡行为的影响。     

The Squeezing Operator and the Squeezed States of "Superspace

ＴｈｅＳｑｕｅｅｚｉｎｇＯｐｅｒａｔｏｒａｎｄｔｈｅＳｑｕｅｅｚｅｄＳｔａｔｅｓｏｆ＂Ｓｕｐｅｒｓｐａｃｅ＂￥ＳＵＮＣｈａｎｇｙｏｕ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＨｅｉｈｅＴｅｃｈｅｒ＇ｓＣｏｌｌｅｇｅ，Ｈｅｉｈｅ１６４３００）ＭＡＡｉｑ...     

双参数形变谐振子湮没算符高次幂本征态的反聚束效应

研究了双参数形变谐振子湮没算符高次幂(akqs,k≥3)本征态的反聚束效应,并就k=3的情况运用数值计算方法研究了双参数形变对该效应的影响.结果表明,在双参数形变相干态中谐振子强度x=｜α｜²的若干取值区间内,akqs的本征态均可呈现反聚束效应,并且明显地受到qs形变参数的影响.     

测量相位算符在压缩热场态中的压缩效应

利用Bannett和Pegg提出的测量相位算符讨论了压缩热场态中测量相位算符的压缩效应。结果表明测量相位算符在压缩热场态中存在CS类压缩，压缩特性与相干态参数幅角θ、平均光子数n^-和压缩参量r有密切的关系。随着n^-和r的增大，CS类压缩效应逐渐减弱，直至完全消失。另有计算表明测量相位算符在压缩热场态中不存在CN和SN类压缩。     

q变形非简谐振子湮没算符高次幂本征态的反聚束特性

研究了q变形非简谐振子湮没算符高次幂本征态的反聚束特性,并用数值计算方法定量研究了变形参量q对这一特性的影响.结果表明,q变形非简谐振子湮没算符高次幂本征态在非谐振子强度x│=β│²的若干取值区间内可多次交替地呈现反聚束效应,并且变形参量q对这一效应有很大的影响.     

参数化玻色湮灭算符高次幂的本征态及其量子起伏规律

以参数化方式「ｙ」＝（ｑ＾ｙ－１）／（ｑ－１）定义ｑ玻色湮灭算符ａｑ，生成相应的ｑ相干态，找出能产生并保持这类ｑ相干态的体系的哈密顿量。研究了α＾ｋｑ的正交归一本征态的数学结构和量子起伏性质，发现这些本征态中只有偶ｑ相干态存在通常的压缩效应，并且当ｑ〈１时，场的两个正交分量在各态中的量子起估可以同时有小于相干态的最小不确定度，有ｑ压缩效应。     

Properties of Amplitude N th-power Squeezing of Even and Odd qs-Coherent States

ＰｒｏｐｅｒｔｉｅｓｏｆＡｍｐｌｉｔｕｄｅＮｔｈ┐ｐｏｗｅｒＳｑｕｅｅｚｉｎｇｏｆＥｖｅｎａｎｄＯｄｄｑｓ┐ＣｏｈｅｒｅｎｔＳｔａｔｅｓＷＡＮＧＪｉｓｕｏ１）ＳＵＮＣｈａｎｇｙｏｎｇ１）ＨＥＪｉｎｙｕ２）（１）ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ...     

q－玻色湮没算符高次幂的本征态及其性质

研究ｑ－玻色湮没算符高次幂（ｋ≥３）的正交归一本征态的数学结构，在此基础上讨论了它们的数学性质及其ｑ－压缩和振幅Ｎ次方压缩特性．发现它们能组成一个完备的希尔伯特（Ｈｉｌｂｅｒｔ）空间；且当ｋ为偶数时，这些本征态均可存在振幅Ｎ次方压缩．     

New Normally Ordered Four-Mode Squeezing Operator for Standard Squeezing of Four-Mode Quadratures

By virtue of the technique of integration within an ordered product of operators a new four-mode squeezing operator that squeezes the four-mode quadrature operators of light field in the standard way is found. This operator differs from the direct product of two two-mode squeezing operators, It is the exponential operator V≡exp[ir （Q1P2＋Q2P3＋Q3P4＋Q4P1）].The Wigner function of the new four-mode squeezed state is ealculated,which quite differs from that of the direct-product state of two usual two-mode squeezed states.     

Q变形非简谐振子湮没算符高次幂本征态的反聚束效应

引入了一种量子反聚束效应,研究了Q变形非简谐振子湮没算符K次幂(K≥3)的K个本征态的量子反聚束效应,探讨了这些本征态的物理意义.结果表明,这K个本征态均可呈现量子反聚束效应,它们都可由不同时刻依赖于时间的Q变形非简谐振子广义相干态的线性叠加而生成.     

q变形算符aN的本征态的结构及其高阶压缩性质

证明了高阶振幅压缩的概念可以应用于q变形代数的光场。q变形算符aN 的正交归一本征态的压缩特点由这些态的内部奇偶结构决定。破坏这种奇偶结构将得到具有新压缩特点的光场。     

相干态Jaynes－Cummings模型中场的振幅N次方压缩

研究了一初始处于基态的二能级原子与相干态光场相互耦合的单光子Ｊａｙｎｅｓ－Ｃｕｍｍｉｎｇｓ（Ｊ－Ｃ）模型中场的振幅Ｎ次方压缩特性，并讨论了其压缩度随光场的初始平均光子数ｎ和压缩阶数Ｎ的变化．     

一种新的偶奇非线性相干态中测量相位算符的压缩效应

利用Bamett和pegg提出的测量相位算符讨论了一种新的偶奇非线性相干态的压缩效应。结果表明，在这种偶奇非线性相干态中测量相位算符不存在CN和SN类压缩，只存在CS类压缩。利用数值计算方法研究了CS类压缩效应，结果表明与通常的偶奇相干态的不同的是，偶非线性相干态在大区域内出现压缩效应而奇非线性相干态在小区域内才出现压缩效应。     

One- and Two-Mode Combination Squeezing Operator for Two Harmonic Oscillators with Coordinate-Momentum Coupling

By virtue of the technique of integration within an ordered product of operators, we derive the normal ordering expansion of a one- and two-mode combination squeezing operator for two harmonic oscillators with coordinatemomentum coupling. It turns out that this squeezing operator just diagonalizes the Hamiltonian H = p21/2m1 m1ω21x21/2 p22/2m2 m2ω22x22/2 - λx2p1, so its ground state is a one- and two-mode combination squeezed state.Quantum fluctuation in the ground state is calculated.     

Energy Translation and Proper-Time Eigenstates

The usual quantum mechanics describes the mass eigenstates. To describe the proper-time eigenstates, a duality theory of the usual quantum mechanics was developed. The time interval is treated as an operator on an equal footing with the space interval, and the quantization of the spacetime intervals between events is obtained. As a result, one can show that there exists a zero-point time interval.     

One- and Two-Mode Combination Squeezing Operator for Two Harmonic Oscillators with Coordinate-Momentum Coupling

By virtue of the technique of integration within an ordered product of operators, we derive the normal ordering expansion of a one- and two-mode combination squeezing operator for two harmonic oscillators with coordinate- momentum coupling. It turns out that this squeezing operator just diagonalizes the Hamiltonian H=p^21/2m1＋m1ω^21x^21/2＋p^222m2＋m2ω^22x^22/2-λx2p1 so its ground state is a one- and two-mode combination squeezed state. Quantum fluctuation in the ground state is calculated.