共查询到17条相似文献,搜索用时 78 毫秒
1.
提出了制备势阱中的两离子EPR态的一种方法. 这种方法是基于频率调制的行波光场与囚禁离子的相互作用.这种方法的一个突出优点是所制备的量子态为“暗态”,即自发辐射相消的量子态。另外,讨论了二模压缩运动态(两离子质心模式和呼吸模式)的制备. 相似文献
2.
本文提出一个方案以制备一个被囚禁在谐势阱中的离子质心运动的压缩数态。在本方案中,这个离子受到两个分别调到第一高、低振动边带的激光场和一个与离子共振的激光场的轮流激发。系统最后被制备到运动压缩数态与电子基态的直积。 相似文献
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提出一个方案用于制备囚禁离子的簇态,制备过程中振动模仅仅是被虚激发。方案用双能级离子制备簇态,只要一束激光照射两个相互作用的离子。方案简单易行,成功几率可达到100. 相似文献
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为了避免激光相位的起伏对几何相位逻辑门保真度的影响, 提出一种基于囚禁离子的量子几何相位逻辑门的新方案。该机制是利用一束频率调制的行波激光场作用于两个囚禁离子上实现的。它的优点有:操作简单,仅需一步就能实现。不灵敏于激光场的相位也不需要对囚禁离子进行个别寻址。 相似文献
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N个热囚禁离子的GHZ态的制备 总被引:1,自引:1,他引:0
我们提出了一个简单的方法产生N个囚禁离子的GHZ态.在这个方法中,初始时处于相同态的N个两能级离子被囚禁在一个线性阱中,同时被两束均匀的经典激光照射.这个方法对振动模的加热不敏感,从退相干的观点来看这点很重要. 相似文献
7.
Paul阱中囚禁离子质心运动量子态的压缩效应 总被引:1,自引:1,他引:0
文章研究Paul阱中被囚禁离子才动量在奇偶相干的的压缩性质。研究结果表明,囚禁离子不仅有二阶压缩效应,而且有高阶压缩效应,本文具体给出了囚禁离子的位置和动量在奇偶相干态中的二阶和四阶压缩条件及压缩曲线。 相似文献
8.
讨论了囚禁离子与两驻波场相互作用时的量子相干性.在大失谐的条件下,离子的振动能量呈现崩塌-回复的相干性特征,表明离子的振动态具有压缩效应.无量纲压缩参数G3愈大,囚禁离子的振动态压缩效应愈显著.进一步增大参数G3,所能得到的最大压缩反而减小. 相似文献
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提出了一个实现两离子量子逻辑门的简单方案。本方案使用了两个囚禁于线性阱的三能级离子。本方案不使用振动模作为数据总线,仅需要激光与离子的单个相互作用,因而相互作用时间变短,这点从退相干的角度看是很重要的,而且本方案对振动模的加热不敏感。 相似文献
11.
Several schemes have been proposed to prepare two-mode squeezed state and entanglement state between motional states of a single trapped ion and light. Preparation of two-mode squeezed state is based on interaction of a trapped ion located in light cavity with cavity field. Preparation of entanglement state is based on interaction of a trapped ion located in light cavity with cavity field and a traveling wave light field. 相似文献
12.
Generation of unconventional geometric phase gates in ion trap-optical cavity system by squeezed operators 下载免费PDF全文
Based on squeezed operators this paper has implemented an ideal
unconventional geometric quantum gate (GQG) in ion trap-optical
cavity system by radiating the trapped ions with the cavity field of
frequency wc and an external laser field of frequency
wL. It can ensure that the gate time is shorter than
the coherence time for qubits and the decay time of the optical
cavity by appropriately tuning the ionic transition frequency
w0, the frequencies of the cavity mode wc and
the vibrational mode ν. It has also realized the unconventional
GQG under the influence of the cavity decay based on the
squeezed-like operators and found that the present scheme works well
for the smaller cavity decay by investigating the corresponding
fidelity and success probability. 相似文献
13.
WANG Zhong-Jie 《理论物理通讯》2010,54(6):1109-1111
Several schemes have been proposed to prepare two-mode squeezed state and entanglement state between motional states of a single trapped ion and light. Preparation of two-mode squeezed state is based on interaction of a trapped ion located in light cavity with cavity field. Preparation of entanglement state is based on interaction of a trapped ion located in light cavity with cavity field and a traveling wave light field. 相似文献
14.
This paper presents a realistic scheme for the teleportation of
coherent states in which a two-mode squeezed vacuum state serves as
the quantum channel and the position-sum and momentum-difference of
two local modes serve as the measuring observables. The average
fidelity of the teleportation of coherent states is derived for
finite squeezing parameters and it turns out that fidelity greater
than 1/2 cannot be achieved by using a classical channel alone and
the probability distribution of the measurement result is a Gaussian
distribution around the unknown parameter of the input coherent
state with a width given by the squeezing parameter. 相似文献
15.
低频压缩态光场可用于提高引力波探测器灵敏度, 近年来受到人们的广泛关注. 相对于高频段而言, 低频压缩态的产生更容易受到外界环境噪声的干扰而不易被观察到. 本文采用全固化单频倍频Nd: YVO4/KTP激光器作为光源, 利用双波长共振的光学参量振荡器实现参量过程, 以1064 nm波长的红外作为基频光, 激光器腔内倍频产生的532 nm绿光作为抽运光, 通过调节周期性极化磷酸氧钛钾晶体温度使光学参量振荡器达到双波长同时共振, 采用真空注入的方式, 利用Pound-Drever-Hall锁腔技术锁定抽运场. 输出压缩光通过平衡零拍探测, 最终在实验上获得了频率低至3 kHz的真空压缩, 所直接观察到的压缩度为2 dB. 相似文献
16.
Quantum phase distribution and the number—phase Wigner function of the generalized squeezed vacuum states associated with solvable quantum systems 下载免费PDF全文
The quantum phase properties of the generalized squeezed vacuum states associated with solvable quantum systems are studied by using the Pegg-Barnett formalism.Then,two nonclassical features,i.e.,squeezing in the number and phase operators,as well as the number-phase Wigner function of the generalized squeezed states are investigated.Due to some actual physical situations,the present approach is applied to two classes of generalized squeezed states:solvable quantum systems with discrete spectra and nonlinear squeezed states with particular nonlinear functions.Finally,the time evolution of the nonclassical properties of the considered systems has been numerically investigated. 相似文献
17.
Properties of field quantum entropy evolution in the Jaynes--Cummings model with initial squeezed coherent states field 下载免费PDF全文
The properties of the field quantum entropy evolution in a system of
a single-mode squeezed coherent state field interacting with a
two-level atom is studied by utilizing the complete quantum theory,
and we focus our attention on the discussion of the influences of
field squeezing parameter $\gamma $, atomic distribution angle
$\theta $ and coupling strength $g$ between the field and the atom
on the properties of the evolution of field quantum entropy. The
results obtained from numerical calculation indicate that the
amplitude of oscillation of field quantum entropy evolution
decreases with the increasing of squeezing parameter $\gamma $, and
that both atomic distribution angle $\theta $ and coupling strength
$g$ between the field and the atom can influence the periodicity of
field quantum entropy evolution. 相似文献