全文获取类型
收费全文 | 1058篇 |
免费 | 507篇 |
国内免费 | 153篇 |
专业分类
化学 | 117篇 |
晶体学 | 1篇 |
力学 | 9篇 |
综合类 | 6篇 |
数学 | 23篇 |
物理学 | 1562篇 |
出版年
2024年 | 7篇 |
2023年 | 17篇 |
2022年 | 57篇 |
2021年 | 66篇 |
2020年 | 47篇 |
2019年 | 39篇 |
2018年 | 46篇 |
2017年 | 29篇 |
2016年 | 55篇 |
2015年 | 30篇 |
2014年 | 106篇 |
2013年 | 97篇 |
2012年 | 106篇 |
2011年 | 123篇 |
2010年 | 130篇 |
2009年 | 122篇 |
2008年 | 155篇 |
2007年 | 111篇 |
2006年 | 98篇 |
2005年 | 72篇 |
2004年 | 48篇 |
2003年 | 48篇 |
2002年 | 25篇 |
2001年 | 16篇 |
2000年 | 18篇 |
1999年 | 10篇 |
1998年 | 4篇 |
1997年 | 10篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
排序方式: 共有1718条查询结果,搜索用时 266 毫秒
101.
102.
A novel quantum key distribution scheme based on the path-spin hybrid entanglement is proposed and analyzed. In this proposed scheme, the entanglement between the path and the spin degrees of freedom is confined locally with the single particle and transmitted in one-way direction. Two split pulses of a single spin-1/2 particle are not simultaneously transmitted through the public quantum channels for the security goal. The scheme is robust against any individual attack even in noisy environments. Moreover, it also has high-efficiency since one single particle can be used to generate one bit key on average. 相似文献
103.
We investigate the effects of three-site interactions on the pairwise entanglement in a three-qubit Heisenberg XX model. We find the three-site interactions only in favor of the thermal entanglement and benefit the teleportation between the next-to-nearest neighbor qubits. In addition, we also study the stationary entangled state in the model with intrinsic decoherence taken into account. The influence of different types of three-site interactions on the stationary entangled state is then examined. 相似文献
104.
Erhan Albayrak 《Optics Communications》2011,284(6):1631-1636
The negativity as a measure of thermal entanglement was studied for a two-qutrit spin-1 anisotropic Heisenberg XYZ chain with Dzyaloshinskii-Moriya (DM) interaction in a homogeneous magnetic field in detail. An analytical expression was found for the negativity and then the thermal variations of negativity were investigated in full detail for given values of the DM interaction parameter Dz, the external magnetic field B, the measure of the anisotropy on the xy-plane γ = (Jx − Jy)/(Jx + Jy), a parameter J = (Jx + Jy)/2 and the bilinear interaction parameter Jz along the z-axis. 相似文献
105.
Dynamics of a multi-mode maximum entangled coherent state over an amplitude damping channel
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The dynamics of the maximum entangled coherent state traveling through an amplitude damping channel is investigated. For small values of the transmissivity rate, the traveling state is very fragile to this noise channel, which suffers from the phase flip error with high probability. The entanglement decays smoothly for larger values of the transmissivity rate and speedily for smaller values of this rate. As the number of modes increases, the traveling state over this noise channel quickly loses its entanglement. The odd and even states vanish at the same value of field intensity. 相似文献
106.
Using the algebraic dynamical method,the entanglement dynamics of an atom-field bipartite system in a mixed state is investigated.The atomic center-of-mass motion and the field-mode structure are also included in this system.We find that the values of the detuning and the average photon number are larger,the amplitude of the entanglement is smaller,but its period does not increase accordingly.Moreover,with the increase of the field-mode structure parameter and the transition photon number,the amplitude of the entanglement varies slightly while the oscillation becomes more and more fast.Interestingly,a damping evolution of the entanglement appears when both the detuning and the atomic motion are considered simultaneously. 相似文献
107.
GUO KeTao LIANG MingChao XU HongYu & ZHU ChengBo School of Applied Science Jiangxi University of Science Technology Ganzhou China 《中国科学:物理学 力学 天文学(英文版)》2011,(3)
By using the concept of negativity, we investigate the thermal entanglement of a two-spin (1/2, 3/2) mixed-spin Heisenberg XX chain with an inhomogeneous external magnetic field. We obtain the analytical results of entanglement of this model. For the case of uniform magnetic field, we find that the critical temperature is higher than the results of the spin-1/2 chain and (1/2,1) mixed-spin chain. And by adjusting the nonuniform parameter b, one is able to obtain more entanglement at a higher temperature. 相似文献
108.
ZHAO ChunRan & YE Liu School of Physics & Materials Science Anhui University Hefei China School of Physics & Electronic Information Huaibei Normal University Huaibei 《中国科学:物理学 力学 天文学(英文版)》2011,(3)
A scheme is proposed for generating a multiphoton entangled cluster state among four modes. The scheme only uses Kerr medium, beam splitter and homodyne measurements on coherent light fields, which can be efficiently made in quantum optical laboratories. The photon in the signal mode is prepared in a superposition state of the vacuum state and one-photon state while the probe beam is initially set in a coherent state superposition. The strong probe mode interacts successively with multiple signal-mode photo... 相似文献
109.
研究了N+2(其中N个原子与光场非共振作用,2个原子与光场共振作用)原子受简并双光子作用的纠缠动力学,得到2个共振原子的纠缠度的解析表达式。结果表明:在简并双光子作用下,纠缠度的时间演化出现有规则的崩塌回复现象,并且崩塌回复周期比单光子作用下时要短。此外,N+2原子与光场间的相对耦合系数对简并双光子情形下的纠缠度有更灵敏的影响。 相似文献
110.
研究了两种典型的量子纠缠消相干现象对确定型量子态远程制备方案的影响.首先对该确定型远程制备方案进行了分析,得到该方案确定性和比特消耗情况; 然后通过分析制备过程中纠缠消相干现象对系统的影响得出: 在极化消相干过程中,该系统保真度与目标量子比特在Bloch球上的经度选择无关,仅与目标比特的纬度和消相干的大小有关;在相位消相干中,该系统的保真度不会受到消相干的影响,仅与目标量子态的纬度相关.
关键词:
远程制备
纠缠消相干
通信消耗
保真度 相似文献