共查询到20条相似文献,搜索用时 46 毫秒
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色散吸收非对称介质光腔中光场的量子理论 总被引:7,自引:2,他引:5
利用格林函数方法对色散吸收介质中的电磁场量子化,研究了由色散吸收介质构成的非对称介质光腔中光场的量子理论,并分析了非对称性对光腔量子性质、工作性能等的影响. 相似文献
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德国物理学家马克斯8226;普朗克(Max Karl Ernst Ludwig Planck, 1858~1947) 在解决经典物理学的困难——黑体辐射问题时,提出能量子假说,引入了一个常数h,并因此荣膺1918年的诺贝尔物理学奖。 相似文献
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量子导引相较于其他量子纠缠类型的优势在于它具有天然的不对称性,可以实现单向、且一方设备不依赖的量子任务。本文研究了特殊条件下,即力学振子的频率刚好是腔的自由光谱区的一半时,由单泵浦的光力学系统中产生的三组份量子导引特性。研究结果表明:力学模对两个光模的导引要强于光模对力学模的导引,联合导引的能力要大于单个导引的能力,且通过调节失谐量或温度可以实现力学模和光模之间的单向导引和双向导引之间的转换。该研究对于实现更安全的量子通信和构建多频率系统混合的量子网络具有一定的参考价值。 相似文献
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本文分析和测量了双缝衍射缺级处附近两个弱峰的相对光强,并与计算机数值计算得到的理论值对比表明:理论描述与实验情景是相符合的。 相似文献
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Kenji Tokuo 《International Journal of Theoretical Physics》2004,43(12):2461-2481
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Roumen Tsekov 《International Journal of Theoretical Physics》2009,48(1):85-94
A nonlinear theory of quantum Brownian motion in classical environment is developed based on a thermodynamically enhanced nonlinear Schrödinger equation. The latter is transformed via the Madelung transformation into a nonlinear quantum Smoluchowski-like equation, which is proven to reproduce key results from the quantum and classical physics. The application of the theory to a free quantum Brownian particle results in a nonlinear dependence of the position dispersion on time, being quantum generalization of the Einstein law of Brownian motion. It is shown that the time of decoherence from quantum to classical diffusion is proportional to the square of the thermal de Broglie wavelength divided by the classical Einstein diffusion constant. 相似文献
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在不规则衍射理论的基础上,分析了从可见光到近红外波段冰晶粒子的光散射特性。计算了粒子尺度为20μm,50μm,80μm的五种典型冰晶粒子的消光效率因子和吸收效率因子。最后,为了评估不规则衍射理论的精确性,与有限时域差分法和几何光学法进行了比较。 相似文献
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We present a quantum theory of light based on the recent derivation of Weyl and Dirac quantum fields from general principles ruling the interactions of a countable set of abstract quantum systems, without using space–time and mechanics (D’Ariano and Perinotti, 2014). In a Planckian interpretation of the discreteness, the usual quantum field theory corresponds to the so-called relativistic regime of small wave-vectors. Within the present framework the photon is a composite particle made of an entangled pair of free Weyl Fermions, and the usual Bosonic statistics is recovered in the low photon density limit, whereas the Maxwell equations describe the relativistic regime. We derive the main phenomenological features of the theory in the ultra-relativistic regime, consisting in a dispersive propagation in vacuum, and in the occurrence of a small longitudinal polarization, along with a saturation effect originated by the Fermionic nature of the photon. We then discuss whether all these effects can be experimentally tested, and observe that only the dispersive effects are accessible to the current technology via observations of gamma-ray bursts. 相似文献
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Richard Jozsa 《Annals of Physics》2003,306(2):241-279
Pell’s equation is x2−dy2=1, where d is a square-free integer and we seek positive integer solutions x,y>0. Let (x0,y0) be the smallest solution (i.e., having smallest ). Lagrange showed that every solution can easily be constructed from A so given d it suffices to compute A. It is known that A can be exponentially large in d so just to write down A we need exponential time in the input size . Hence we introduce the regulator R=lnA and ask for the value of R to n decimal places. The best known classical algorithm has sub-exponential running time . Hallgren’s quantum algorithm gives the result in polynomial time with probability . The idea of the algorithm falls into two parts: using the formalism of algebraic number theory we convert the problem of solving Pell’s equation into the problem of determining R as the period of a function on the real numbers. Then we generalise the quantum Fourier transform period finding algorithm to work in this situation of an irrational period on the (not finitely generated) abelian group of real numbers. This paper is intended to be accessible to a reader having no prior acquaintance with algebraic number theory; we give a self-contained account of all the necessary concepts and we give elementary proofs of all the results needed. Then we go on to describe Hallgren’s generalisation of the quantum period finding algorithm, which provides the efficient computational solution of Pell’s equation in the above sense. 相似文献
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提出了一种基于N个有序纠缠光子对量子机密共享方案.用纠缠光子作为信息的载体,密钥管理者Alice将纠缠光子对分成两个序列,其中一个序列直接发送给合作者之一Bob,在确保第一个序列发送安全后,再对第二个序列进行编码,发送给另一个合作者Charlie.Bob和Charlie分别对他们所接收到的光子序列进行Bell基联合测量,从而得到Alice所发布的密钥,完整密钥的获得需要管理者和所有合作者共同实现.本方案采用两体纠缠态,相对三体纠缠态来说,在实验上更容易实现,仅需要线性光学元件和简单的纠缠源. 相似文献
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B. L. Hu 《International Journal of Theoretical Physics》2002,41(11):2091-2119
We describe a kinetic theory approach to quantum gravity by which we mean a theory of the microscopic structure of space-time, not a theory obtained by quantizing general relativity. A figurative conception of this program is like building a ladder with two knotty poles: quantum matter field on the right and space-time on the left. Each rung connecting the corresponding knots represents a distinct level of structure. The lowest rung is hydrodynamics and general relativity; the next rung is semiclassical gravity, with the expectation value of quantum fields acting as source in the semiclassical Einstein equation. We recall how ideas from the statistical mechanics of interacting quantum fields helped us identify the existence of noise in the matter field and its effect on metric fluctuations, leading to the establishment of the third rung: stochastic gravity, described by the Einstein–Langevin equation. Our pathway from stochastic to quantum gravity is via the correlation hierarchy of noise and induced metric fluctuations. Three essential tasks beckon: (1) deduce the correlations of metric fluctuations from correlation noise in the matter field; (2) reconstituting quantum coherence—this is the reverse of decoherence—from these correlation functions; and (3) use the Boltzmann–Langevin equations to identify distinct collective variables depicting recognizable metastable structures in the kinetic and hydrodynamic regimes of quantum matter fields and how they demand of their corresponding space-time counterparts. This will give us a hierarchy of generalized stochastic equations—call them the Boltzmann–Einstein hierarchy of quantum gravity—for each level of space-time structure, from the the macroscopic (general relativity) through the mesoscopic (stochastic gravity) to the microscopic (quantum gravity). 相似文献