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41.
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In this paper,we study quantum dynamics of entanglement and single excitation transfer(SET) in an LH1-RC-type trimer which can describe a basic unit cell in the LH1-RC complex in the photosynthetic process.It is shown that there exists a sudden change of entanglement at the critic point of quantum phase transition(QPT) of the system at low temperatures,the entanglement sudden change caused by the QPT is suppressed at higher temperatures.We investigate the influence of environment on entanglement and SET.We show the generation of the dephasing-assisted entanglement between a donor and an acceptor and the existence of the steady-state entanglement,and demonstrate the entanglement transfer from donor-donor entanglement to donor-acceptor entanglement in the dynamic evolution.We reveal the close relation between the SET probability and donor-acceptor entanglement.Especially,we find that the SET probability is proportional to the amount of donor-acceptor entanglement under certain conditions. 相似文献
43.
We study exciton transfer dynamics in a trimer system by investigating excitation transfer probability (ETP). We calculate ETP in the zero-temperature limit and theoretically predict the environment-assisted quantum critical effect, in which ETP exhibits a sudden change at the critical point of quantum phase transition for the trimer. In particular, we find that the steady-state ETP can be observed in the presence of the environment interaction. 相似文献
44.
Controllable cross-Kerr interaction between microwave photons in circuit quantum electrodynamics 下载免费PDF全文
We propose a scheme to enable a controllable cross-Kerr interaction between microwave photons in a circuit quantum electrodynamics(QED) system.In this scheme we use two transmission-line resonators(TLRs) and one superconducting quantum interference device(SQUID) type charge qubit,which acts as an artificial atom.It is shown that in the dispersive regime of the circuit-QED system,a controllable cross-Kerr interaction can be obtained by properly preparing the initial state of the qubit,and a large cross-phase shift between two microwave fields in the two TLRs can then be reached.Based on this cross-Kerr interaction,we show how to create a macroscopic entangled state between the two TLRs. 相似文献
45.
Quantitative evaluation of space charge effects of laser-cooled three-dimensional ion system on a secular motion period scale 下载免费PDF全文
In this paper,we introduce a method of quantitatively evaluating and controlling the space charge effect of a lasercooled three-dimensional(3 D) ion system in a linear Paul trap.The relationship among cooling efficiency,ion quantity,and trapping strength is analyzed quantitatively,and the dynamic space distribution and temporal evolution of the 3 D ion system on a secular motion period time scale in the cooling process are obtained.The ion number influences the eigen-micromotion feature of the ion system.When trapping parameter q is ~ 0.3,relatively ideal cooling efficiency and equilibrium temperature can be obtained.The decrease of axial electrostatic potential is helpful in reducing the micromotion heating effect and the degradation in the total energy.Within a single secular motion period under different cooling conditions,ions transform from the cloud state(each ion disperses throughout the envelope of the ion system) to the liquid state(each ion is concentrated at a specific location in the ion system) and then to the crystal state(each ion is subjected to a fixed motion track).These results are conducive to long-term storage and precise control,motion effect suppression,high-efficiency cooling,and increasing the precision of spectroscopy for a 3 D ion system. 相似文献
46.
一、引 言 类金刚石薄膜有很多优越的性质,除了化学惰性外,它还具有很好的电学、光学和机械性能,如电阻率高,可见,紫外和红外光的透射性好以及附着力强等。至今已有各种各样的制备类金刚石的方法。如热解、离子束、溅射和等离子体化学气相沉积(PCVD)等。 本文采用的方法是在热丝CVD中加入直流放电。由于把直流放电和热解化学的方法结合起来,增强了CH_4的分解,同时为了了解成膜的微观过程,采用等离子体参数的诊断方法,实地监测膜的生成过程,对实现具有一定性质的类金刚石膜的重复生长是有利的。 相似文献
47.
Linear Optical Implementation for Quantum Teleportation of Unknown Two-Qubit Entangled States 总被引:3,自引:0,他引:3 下载免费PDF全文
We present a linear optical implementation for quantum teleportation of an unknown two-qubit entangled state by using linear optical elements, such as beam splitters, phase shifters, and half wave plates. This method is based on the single photon representation of quantum bits. Four location qubits and one polarization qubit are used to realize quantum logical operations in the teleportation procedure of the unknown two-qubit entangled state. 相似文献
48.
多体微扰论有效算符方法应用于超精细结构的计算 .由HF波函数计算零阶超精细常数 .使用基样条构造了薛定谔方程的有限基集 .使用这些有限基集计算了原子实极化和关联 ,以及 7Li,2 3 Na ,3 9K和4 3 Ca离子的s1/ 2 ,p1/ 2 和p3 / 2 态的超精细结构常数和4 3 Ca离子的d3 / 2和d5/ 2 态的超精细常数 . The effective-operator form of many-body theory is applied to the calculation of hyperfine structure. The zeroth order hyperfine constants are evaluated with Hartree-Fock wavefunction. Τhe finite basis sets of Schrdinger s equation are constructed by using B-splines. With the finite basis sets, we have calculated the core polarization, and the correlation diagrams. The hyperfine constants of the s 1/2, p 1/2and p 3/2 states of 7Li, 23Na, 39K, 43Ca + as well as the d 3/2... 相似文献
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50.
本文反相干态的概念推广到李超代数的情形.我们具体地构造了李超代数B(0,1)的超相干态,计算了B(0,1)生成元在超相干态表示中的矩阵元,获得了B(0,1)代数的一种非齐次微分实现.这种非齐次微分实现对研究量子力学中的准精确可解问题有用. 相似文献