利用相干经典场操控激子间的纠缠度和混合度

借助于共生纠缠度和线性熵,研究了两个受驱动的量子点与单模腔场系统中激子纠缠度和混合度的演化动力学行为.结果表明:当无外加驱动场,激子的纠缠度和混合度呈现周期性的振荡.当激子受外经典场驱动时,其纠缠度和混合度都将减少.但Ω/g调节合适,我们能有效的抑制态的混合度而制备出一个纯净的激子纠缠态.     

环境温度对多光子Jaynes-Cummings模型制备的原子与单模腔场纠缠态的影响

借助于共生纠缠度方法 ,考察了共振的多光子Jaynes-Cummings模型的热纠缠态现象 .研究结果表明 :原子与单模腔场形成纠缠态的纠缠度随环境温度升高而急剧地减小 ,但在该Jaynes -Cummings模型中存在产生热纠缠态的临界温度 ,当环境温度超过这一温度值时 ,原子与腔场的纠缠态消失 .同时也表明 ,临界温度仅由原子与腔肠的耦合强度和原子跃迁时发射或吸收光子数决定 .因此 ,选择强耦合的原子与腔场量子系统可以在较高环境温度下实现原子与腔场的纠缠态并保持它 .     

两能级原子与腔场非共振耦合中的热纠缠现象

利用共生纠缠度(concurrence),讨论了二能级原子囚禁于单模腔场所构成系统的纠缠度变化规律．在环境温度为绝对零度时,原子与腔场只在共振(△=0)或非共振但|△|=2g条件下,系统才有可能达到最大纠缠态;系统存在上限温度Tc=1.134ht/k 与失谐量△无关;当环境温度T>Tc时,系统完全消相干,当环境温度T相似文献   

微波场纠缠态的制备

利用LC电路和处于纠缠态的自旋离子的相互作用,设计了微波场纠缠态的制备方案。通过测量两离子的状态,可以得知微波场处于哪种纠缠态。     

在耦合的激子——光子系统中相干激子态的线性熵演化

研究了与单模腔耦合的两大半导体量子点相干激子态的线性熵演化.线性熵是gt的理想周期函数，表明在此情形下能制备最大激子纠缠相干态.还讨论了绝对零度环境下对激子相干态线性熵的影响.     

利用经典驱动场增大耗散超导比特系统的稳态量子相干性

本文在相位退相干的超导系统中,研究了经典驱动场对超到量子比特与数据总线之间量子纠缠和量子相干动力学的影响.发现在长时间的演化过程中,超导量子比特与数据总线之间会产生稳态量子纠缠和量子相干性,通过调节经典驱动场可以提高稳态量子纠缠和量子相干性.此外,利用迹距离的方法,本文还研究了经典驱动场对于超导系统与环境之间信息流动的...     

通过原子一腔场相互作用建立多原子GHZ态的方案(英文)

在本文中,提出了一种建立多原子纠缠态的方法,这种方法是基于原子─腔场相互作用．适当制备的原子与初始处于真空态的腔场相互作用后,腔场处于数态和真空态的叠加态;随后把制备在基态的原子注入腔中共经历一个共振单光子转移,原子处于纠缠GHZ态而腔场仍处于真空态．     

PtI化合物激子的静电场行为

基于Baeriswyl-Bishop模型,对PtI化合物中的激子态及其在电场中的行为进行了数值模拟.计算表明,当电场为零时,激子是自陷束缚的极化子激子;弱电场对激子无明显影响,激子始终定域在链中部;而当E≥1.6×105V/cm时,激子解离成正负极化子而束缚在链端.     

腔场纠缠相干态的制备

利用单模腔场与二能级原子相互作用的大失谐Jaynes-Cumm inges模型,制备出三腔场纠缠相干态.     

一个腔中实现两种原子量子态的隐形传态

在一个外场驱动的腔QED系统中,利用三原子纠缠态作为量子信道,提出了任意单原子态和两原子纠缠态的隐形传态方案。该方案不受腔损和热场的影响。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.