排序方式: 共有43条查询结果,搜索用时 15 毫秒
1.
提出一种理论方案,利用量子纠缠特性,实现对量子态的远程操作.采用两粒子非最大纠缠态作为资源,借助于辅助量子位,实现态算子的制备,并利用态算子特性,我们能够以一定的概率实现对量子态的远程操作.这种非局域的操作是量子世界特有的现象,这方面的研究有助于对量子力学基本问题的探讨. 相似文献
2.
One- and two-photon absorption-amplification response in a four-level atomic system with vacuum-induced coherence 下载免费PDF全文
This paper theoretically studies the effects of the vacuum-induced coherence
on one- and two-photon absorption in a four-level atomic medium.
It finds that the one- and two-photon absorption and amplification
properties are quite sensitive to the vacuum-induced coherence. It
is also shown that the one- and two-photon absorption spectra can
be dramatically affected by modulating the relative phase of the
applied fields. With the proper choice of the relative phase, the
amplification without inversion for the probe field can be
realized. 相似文献
3.
Optical bistability and multistability in a three-level Δ-type atomic system under the nonresonant condition 下载免费PDF全文
Under a nonresonant condition, we theoretically investigate hybrid
absorptive-dispersive optical bistability and multistability
behaviours in a three-level Δ-type system by using a microwave
field to drive a hyperfine transition between two upper excited
states inside a unidirectional ring cavity. We find that the optical
bistability and multistability behaviours can be controlled by
adjusting the intensity of the microwave field or the intensity of
the coherent coupling field. Furthermore, our studies show an
interesting phenomenon of the transition from the optical
bistability to the optical multistability only by changing the
negative detuning of the coupling field into the positive detuning
of the coupling field. 相似文献
4.
Entanglement swapping between atom and cavity and generation of entangled state of cavity fields 下载免费PDF全文
This paper proposes a scheme where entanglement swapping between atom and cavity can
be realized. \Lambda -type three-level atoms interacting resonantly with
cavity field are considered. By detecting atom and cavity field, it
realizes entanglement swapping between atom and cavity. It uses the technique
of entanglement swapping to generate an entangled state of two cavity fields
by measuring on atoms. It discusses the experimental feasibility of
the proposed scheme
and application of entangled state of cavity fields. 相似文献
5.
Monolayer MnTe2 stabilized as 1T structure has been theoretically predicted to be a two-dimensional (2D) ferromagnetic metal and can be tuned via strain engineering. There is no naturally van der Waals (vdW) layered MnTe2 bulk, leaving mechanical exfoliation impossible to prepare monolayer MnTe2. Herein, by means of molecular beam epitaxy (MBE), we successfully prepared monolayer hexagonal MnTe2 on Si(111) under Te rich condition. Sharp reflection high-energy electron diffraction (RHEED) and low-energy electron diffraction (LEED) patterns suggest the monolayer is atomically flat without surface reconstruction. The valence state of Mn4+ and the atom ratio of ([Te]:[Mn]) further confirm the MnTe2 compound. Scanning tunneling spectroscopy (STS) shows the hexagonal MnTe2 monolayer is a semiconductor with a large bandgap of ~2.78 eV. The valence-band maximum (VBM) locates at the Γ point, as illustrated by angle-resolved photoemission spectroscopy (ARPES), below which three hole-type bands with parabolic dispersion can be identified. The successful synthesis of monolayer MnTe2 film provides a new platform to investigate the 2D magnetism. 相似文献
6.
Without need of another control light, this paper analyses in a time-dependent way a new scheme to achieve ultraslow propagation of the input probe field through a medium composed of two-level atoms where their upper level is split into two hyperfine sub-levels via some applied static field such as a DC magnetic or a DC electric field or whatever other static field.[第一段] 相似文献
7.
8.
9.
磁芯是直线变压器驱动源(LTD)的关键部件之一,起着初、次级能量传递和次级电压感应叠加的作用,磁芯的能量传递效率对LTD系统的效率、体积和重量影响显著。对LTD系统中影响磁芯能量传递效率的原因进行了初步的分析,并利用Pspice软件的非线性磁芯模型对磁芯的工作过程和损耗进行了模拟计算,最后对LTD磁芯的能量传递效率进行了初步的实验研究,在工作电压为20 kV时、脉宽约220 ns时,在2.8 Ω负载上获得了大于60%的能量传递效率。 相似文献
10.