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 324 毫秒
961.
Implementing remote controlled-NOT gates and entanglement swapping via geometric phase gates in ion-trap systems 下载免费PDF全文
We propose a scheme for the implementation of remote controlled-NOT gates and entanglement swapping via geometric phase gates in ion-trap systems. The proposed scheme uses the two ground states of the A-type ions as memory instead of the vibrational mode. And the system is robust against the spontaneous radiation and the dephasing. 相似文献
962.
提出利用绝热过程实现远距离量子纠缠的方案.Λ型原子和经典场、单模腔场发生相互作用,系统的绝热演化在暗态中进行.利用这种绝热演化进行远距离原子、腔场纠缠,可有效地抑制原子的自发辐射噪声. 相似文献
963.
964.
真空场注入三态叠加MFSS光场广义电场的等幂偶次Y压缩 总被引:1,自引:0,他引:1
对真空场注入三态叠加MFSS(多模泛函叠加态)光场|ψ_0~(3)〉q广义电场分量的等幂次偶次振幅压缩特性进行了详细研究,分析了光场经典强度、经典振幅和经典相位的任意空间分布特征、以及真空场注入对该光场的广义电场分量的等幂偶次Y压缩效应其压缩幅度和压缩量的影响。结果发现:导致态|ψ_0~(3)〉q的广义电场分量存在等幂偶次2m次方Y压缩效应的根本原因在于模间的量子干涉效应、态间的量子干涉效应以及模间和态间的量子纠缠效应;真空场注入可使该光场广义电场分量的2m次方Y压缩效应增强、压缩幅度增大、压缩程度加深。 相似文献
965.
A linear map of qudit tomogram onto qubit tomogram (qubit portrait) is proposed as a characteristics of the qudit state. In
view of the qubit-portrait method, the Bell inequalities for two qubits and two qutrits are discussed within the framework
of the probability-representation of quantum mechanics. A semigroup of stochastic matrices is associated with tomographic-probability
distributions of qubit and qutrit states. Bell-like inequalities are studied using the semigroup of stochastic matrices. The
qudit-qubit map of tomographic probability distributions is discussed as an ansatz to provide a necessary condition for the
separability of quantum states. 相似文献
966.
Jun-Mao Ma Zhi-Yong Jiao Ning Li 《International Journal of Theoretical Physics》2007,46(10):2550-2559
The properties of quantum entanglement in the two-photon Tavis–Cummings model with a Kerr nonlinearity are studied in terms
of quantum information entropy theory. The reduced quantum entropy is employed to investigate the quantum entanglement between
two two-level atoms and a single-mode coherent field. The relative quantum entropy is employed to investigate the quantum
entanglement between the two two-level atoms. The influences of the nonlinear interaction of the Kerr medium with the field
and the atomic dipole-dipole interaction on the properties of quantum entanglement of the system are also examined. Some important
results are obtained. 相似文献
967.
968.
969.
Paul Fendley Matthew P. A. Fisher Chetan Nayak 《Journal of statistical physics》2007,126(6):1111-1144
We study the entropy of chiral 2+01-dimensional topological phases, where there are both gapped bulk excitations and gapless
edge modes. We show how the entanglement entropy of both types of excitations can be encoded in a single partition function.
This partition function is holographic because it can be expressed entirely in terms of the conformal field theory describing
the edge modes. We give a general expression for the holographic partition function, and discuss several examples in depth,
including abelian and non-abelian fractional quantum Hall states, and $p+ip$ superconductors. We extend these results to include
a point contact allowing tunneling between two points on the edge, which causes thermodynamic entropy associated with the
point contact to be lost with decreasing temperature. Such a perturbation effectively breaks the system in two, and we can
identify the thermodynamic entropy loss with the loss of the edge entanglement entropy. From these results, we obtain a simple
interpretation of the non-integer ‘ground state degeneracy’ which is obtained in 1+1-dimensional quantum impurity problems:
its logarithm is a 2+1-dimensional topological entanglement entropy. 相似文献
970.
Entanglement between two atoms in the system of SchrSdinger cat state interacting with two entangled atoms 下载免费PDF全文
By the negative eigenvalues of partial transposition of density matrix, this paper investigates the time evolution of entanglement of the two entangled atoms in the system of two atoms interacting with SchrSdinger cat state. The result shows that the two atoms are always in the entanglement state, and the degree of entanglement between the two atoms exhibits ordinary collapses and revivals at 0.2 degree of entanglement, when the light field is large enough. On the other hand, the reinforcement of three different light fields on the degree of entanglement between two atoms is not evident.[第一段] 相似文献