通过大失谐的双光子Jaynes-Cummings模的时间演化和对腔场的探测生成原子纠缠态

提出了通过大失谐的双光子ＪａｙｎｅｓＣｕｍｍｉｎｇｓ模的时间演化和对腔场的探测生成原子纠缠态的方法     

通过大失谐的双光子Jaynes—Cummings模的时间演化和对腔？…

提出了通过大失谐的双光子Ｊａｙｎｅｓ－Ｃｕｍｍｉｎｇｓ模的时间演化和对腔场的探测生成原子纠缠态的方法。     

通过大失谐Jaynes-Cummings模型实现类自旋的腔场GHZ态

提出了一种利用大失谐的Jaynes-Cummings模型实现类自旋的腔场Greenberger-Horne-Zeilinger(缩写为GHZ)态的新方案,并通过对腔场宇称的测量,否定了局域隐变量理论,该方案不需要违背Bell不等式. 关键词：     

利用V-型三能级原子与双模腔场双光子大失谐相互作用制备W纠缠态

本文提出利用V-型三能级原子与双模腔场的双光子大失谐相互作用制备W纠缠态,该方案要求三个三能级原子和一个双模腔场,第一个与腔场作用的原子最初处于激发态,第二个和第三个原子均处于基态,腔场最初处于真空态,合适地选择原子与腔场之间的相互作用时间即可获得三原子W纠缠态.并且此方案可以推广至多原子W纠缠态和多腔场W纠缠态的制备;通过计算共生纠缠度研究系统中态的纠缠演化以及热纠缠现象.     

利用V-型三能级原子与双模腔场 双光子大失谐相互作用制备W纠缠态

本文提出利用 型三能级原子与双模腔场的双光子大失谐相互作用制备W纠缠态,该方案要求三个三能级原子和一个双模腔场,第一个与腔场作用的原子最初处于激发态,第二个和第三个原子均处于基态,腔场最初处于真空态,合适地选择原子与腔场之间的相互作用时间即可获得三原子W纠缠态。并且此方案可以推广至多原子W纠缠态和多腔场W纠缠态的制备;通过计算共生纠缠度研究系统中态的纠缠演化以及热纠缠现象。     

双光子Jaynes-Cummings模型中的纠缠演化和热纠缠态现象

文中利用共生纠缠度研究了双光子Jaynes-Cummings模型中原子与腔纠缠的时间演化和有限温度下系统热纠缠态.结果表明,腔场中原子与腔展现出周期性的纠缠演化过程,演化周期随原子与腔耦合强度的增大而减小;在有限温度下,系统的共生纠缠度随温度的升高而降低,当趋近临界温度时,系统纠缠现象消失,这一临界温度值与原子-腔耦合强度成正比.对于典型的实验数据,临界温度大约在～10-5 K数量级.     

利用大失谐Jaynes-Cummings模型实现原子的隐形传态

提出了一个未知原子的隐形传态方案,它是通过原子与腔场大失谐相互作用实现的.方案中,两原子缠结的EPR态作为联系发送者与接收者之间的量子信息通道,将欲传送的未知原子和EPR态中的一个原子依次注入到初始制备于相干态 |α>的腔场,然后分别对两原子和腔场进行联合测量,通过经典信息通道将测量结果传递给接收者.这样,接收者只要对EPR的另一个原子执行相应的幺正操作就能重构未知原子态.     

相位损耗腔中大失谐Jaynes-Cummings模型中熵的演化

研究了一位于相位损耗腔中大失谐下二能级原子与相干态场相互作用系统中，光场线性熵、原子线性熵以及光场－原子系统线性熵的演化，讨论了原子初始状态和光场的平均光子数对各线性熵的影响，结果表明，光场线性熵和原子线性熵的演化都较强地依赖于原子初始状态，而系统线性熵的演化与原子初始状态无关。由于光场平均光子数的增加，光场、原子和系统的线性熵都会增加。     

推广的Jaynes-Cummings模型中原子纠缠的时间演化和热纠缠态

利用共生纠缠度研究了一个推广Jaynes Cummings模型中两原子纠缠的时间演化和有限温度下系统热纠缠态. 结果表明，腔场中两原子展现出周期性的纠缠演化过程，演化周期随原子偶极 偶极相互作用强度的增大而减小；在有限温度下，系统的共生纠缠度随温度的升高而降低，当趋近临界温度时，系统纠缠现象消失，这一临界温度值与原子偶极-偶极相互作用强度成正比. 对于典型的实验数据，临界温度约在10-5K数量级. 此外，在这种Jaynes Cummings模型中存在量子相位转变. 关键词： Jaynes Cummings模型 原子纠缠态 热纠缠态 共生纠缠度 偶极 偶极相互作用     

Generation of nonclassical states in a large detuning cavity

By using the theory of cavity QED, we study the system in which a two-level atom interacts with a cavity in the case of large detuning. Through the selective detecting of atomic state, Schrodinger cat states and entangled coherent states are easily generated. When the atom is driven by a weak classical field and the cavity field is in the Schrodinger cat state, we study the conditions of generating the Fock states and the maximal success probability. The maximal success probability in our scheme is larger than the previous one.     

Non-Markovian speedup dynamics control of the damped Jaynes-Cummings model with detuning

For a two-level atom in a lossy cavity, a scheme to manipulate the non-Markovian speedup dynamics has been proposed in the controllable environment(the lossy cavity field). We mainly focus on the effects of the qubit-cavity detuning ? and the qubit-cavity coupling strength κ on the non-Markovian speedup evolution of an open system. By controlling the environment, i.e., tuning ? and κ, two dynamical crossovers from Markovian to non-Markovian and from no-speedup to speedup are achieved. Furthermore, it is clearly found that increasing the coupling strength κ or detuning ? in some cases can make the environmental non-Markovianity stronger and hence can lead to faster evolution of the open system.     

Atomic and field dynamics in the time-dependent Jaynes-Cummings model with arbitrary detuning

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃａｖｉｔｙｑｕａｎｔｕｍｅｌｅｃｔｒｏｄｙｎａｍｉｃｓ(ＣＱＥＤ)ｅｆｆｅｃｔｓｉｎｔｈｅｉｎｔｅｒａｃｔｉｏｎｏｆａｔｏｍｗｉｔｈｃａｖｉｔｙｆｉｅｌｄａｒｅｐｒｉｍａｒｉｌｙｂａｓｅｄｏｎｔｈｅｓｔａｎｄａｒｄＪａｙｎｅｓ Ｃｕｍｍｉｎｇｓｍｏｄｅｌ(ＪＣＭ ) [1,2 ] .Ｔｈｉｓｍｏｄｅｌｄｅｓｃｒｉｂｅｓａｎａｔｏｍａｔｒｅｓｔｉｎｔｅｒａｃｔｉｎｇｗｉｔｈａｃｏｎｓｔａｎｔｅｌｅｃｔｒｉｃｆｉｅｌｄｗｉｔｈｏｕｔｔａｋｉｎｇｉｎｔｏａｃｃｏｕｎｔｔｈｅｍｏｄｅ…     

Generation of macroscopic entangled coherent states with large Josephson junctions

We propose a simple and experimental architecture to generate macroscopic entanglement in a solid system which consists of two large Josephson junctions and a flux qubit. Through quantum measuring of flux qubit, entangled coherent states of two large Josephson junctions are obtained. The concurrence of entangled coherent states can be accommodated by adjusted systematic parameters. We also give a brief discussion on the experimental feasibility of this proposal.     

Generation of basis states via variational methods

A systematic means of generating an optimal set of basis states via variational methods is presented. A calculation for ²⁰Ne has been performed and compared with the exact shell model diagonalization. Very good agreement for the lower-lying states in the eigenvalue spectrum has been obtained with relatively few basis states.     

宏观可分辨量子态的产生和检测

本文利用SO(3)旋转群性质得到了非线性双折射介质模型的一个严格解.由此证明相干态进入双折射介质后将产生宏观上可分辨的量子迭加态.为检测它们所产生的干涉条纹,本文采用零拍检测方案,计算了初态为线偏振和圆偏振相干光时零拍检测器输出流的几率分布.     

Evolution of squeezed states in the Jaynes-Cummings model

Squeezed states can be further squeezed if the initial squeezing is smaller than a certain amount. It is pointed out that one atom single-photon and two-photon micromasers could be used to produce squeezed state output, among which single-photon resonant two-photon micromaser may bring about relatively large output with deep squeezing.     

Generation of long-lived isomeric states via bremsstrahlung irradiation

A method to generate long-lived isomeric states effectively for Mössbauer applications is reported. We demonstrate that this method is better and easier to provide highly sensitive Mössbauer effect of long-lived isomers (>1 ms) such as ¹⁰³Rh. Excitation of (γ,γ) process by synchrotron radiation is painful due mainly to their limited linewidth. Instead, (γ,γ’) process of bremsstrahlung excitation is applied to create these long-lived isomers. Isomers of ⁴⁵Sc, ¹⁰⁷Ag, ¹⁰⁹Ag, and ¹⁰³Rh have been generated from this method. Among them, ¹⁰³Rh is the only one that we have obtained the gravitational effect at room temperature.     

利用交叉克尔非线性产生四光子偏振态簇态

提出了一种基于交叉克尔非线性效应产生四光子偏振态簇态的方案,与其他产生四光子簇态的方案比较,该方案引入宇称门的思想和用到基于零差探测的非破坏测量方法,使得该方案在实验上更易于操作及实现.