共查询到20条相似文献，搜索用时 93 毫秒
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１ＩｎｔｒｏｄｕｃｔｉｏｎＷｉｔｈｔｈｅｉｎｃｒｅａｓｅｏｆｔｈｅｄｅｍａｎｄｆｏｒａｔｏｍｉｃａｎｄｉｏｎｉｃｄａｔａｉｎｒｅｓｅａｒｃｈｅｓｏｎｔｈｅｓｏｆｔＸｒａｙ,ｐｌａｓｍａｐｈｙｓｉｃｓａｎｄａｓｔｒｏｐｈｙｓｉｃｓ,ｔｈｅｍｅａｓｕｒ... 相似文献
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1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｍｉｃｒｏｃｈｉｐｌａｓｅｒｓａｒｅｍｉｎｉａｔｕｒｅａｎｄｃｏｎｓｉｓｔｏｆａｓｌｉｃｅｏｆｇａｉｎｍａｔｅｒｉａｌａｎｄｎｏｎｌｉｎｅａｒｃｒｙｓｔａｌ,ｗｉｔｈｍｉｒｒｏｒｃｏａｔｉｎｇｄｅｐｏｓｉｔｅｄｏｎｔｈｅｆａｃｅｓｔｏｄｅｆｉｎｅａ ｐｌａｎｏ ｐｌａｎｏｌａｓｅｒｃａｖｉｔｙ .Ｍａｎｙａｐｐｌｉｃａｔｉｏｎｓｒｅｑｕｉｒｅａｒｅｌｉａｂｌｅ ,ｅｆｆｉｃｉｅｎｔａｎｄｓｈｏｒｔ ｗａｖｅｌｅｎｇｔｈｌｉｇｈｔｓｏｕｒｃｅ .Ｍｉｃｒｏｃｈｉｐｂｌｕｅｌａ… 相似文献
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Ｑｕｅｎｃｈｉｎｇ Ｅｆｆｅｃｔ ｏｆ Ｍｉｃｒｏｗａｖｅ ｔｏ ＤＣ Ｇｌｏｗ Ｄｉｓｃｈａｒｇｅ ｉｎ Ｇａｓ ＬａｓｅｒｓＱｕｅｎｃｈｉｎｇＥｆｆｅｃｔｏｆＭｉｃｒｏｗａｖｅｔｏＤＣＧｌｏｗＤｉｓｃｈａｒｇｅｉｎＧａｓＬａｓｅｒｓ￥ＷＡＮＧＹｕ... 相似文献
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Sergey A. Podoshvedov 《Optics Communications》2012,285(18):3896-3905
We propose an approach with displaced states to use it for rotations of base coherent states and squeezed coherent states. Our approach is based on representation of the coherent states in free-traveling fields in terms of displaced number states with arbitrary amplitude of displacement. Two optical schemes are developed for construction of Hadamard gate for the base states. One of the optical schemes is based on alternation of photon additions and displacement operators (in general case, N-photon additions and N?1-displacements are required) to generate displaced squeezed even/odd superposition of coherent states (SCSs) with high fidelity in dependency on type (computational zero or one) of the base input state. Another optical scheme uses two-photon subtracted squeezed coherent states to approximate outcome of the Hadamard gate for the base squeezed coherent states. Output states approximate with high fidelity either even squeezed SCS or odd SCS shifted relative to each other by some value. It enables to adjust the optical scheme for construction of the Hadamard gate being mainframe element for quantum computation with basic squeezed coherent states. 相似文献
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S. A. Podoshvedov 《Journal of Experimental and Theoretical Physics》2012,114(3):451-464
We study the method of generation of states that approximate superpositions of large-amplitude coherent states (SCSs) with
high fidelity in free-traveling fields. Our approach is based on the representation of an arbitrary single-mode pure state,
and SCSs in particular, in terms of displaced number states with an arbitrary displacement amplitude. The proposed optical
scheme is based on alternation of photon additions and displacement operators (in the general case, N photon additions and N − 1 displacements are required) with a seed coherent state to generate both even and odd displaced squeezed SCSs regardless
of the parity of the used photon additions. It is shown that the optical scheme studied is sensitive to the seed coherent
state if the other parameters are unchanged. Output states can approximate either even squeezed SCS or odd SCS shifted relative
to each other by some value. This allows constructing a local rotation operator, in particular, the Hadamard gate, which is
a mainframe element for quantum computation with coherent states. We also show that three-photon additions with two intermediate
displacement operators are sufficient to generate even displaced squeezed SCS with the amplitude 1.7 and fidelity more than
0.99. The effects deteriorating the quality of output states are considered. 相似文献
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We derive a general phase-matching condition(PMC) for enhancement of sensitivity in SU(1,1) interferometers. Under this condition, the quantum Fisher information(QFI) of two-mode SU(1,1) interferometry becomes maximal with respect to the relative phase of two modes, for the case of an arbitrary state in one input port and an even(odd) state in the other port, and the phase sensitivity is enhanced. We also find that optimal parameters can let the QFI in some areas achieve the Heisenberg limit for both pure and mixed initial states. As examples, we consider several input states: coherent and even coherent states, squeezed vacuum and even coherent states, squeezed thermal and even coherent states. Furthermore, in the realistic scenario of the photon loss channel, we investigate the effect of photon losses on QFI with numerical studies. We find the PMC remains unchanged and is not affected by the transmission coefficients for the above input states. Our results suggest that the PMC can exist in various kinds of interferometers and the phase-matching is robust to even strong photon losses. 相似文献
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Even and odd nonlinear coherent states 总被引：4，自引：0，他引：4
S. Sivakumar 《Physics letters. A》1998,250(4-6):257-262
New types of even and odd nonlinear coherent states are defined. The squeezed vacuum and the squeezed first excited state are shown to be even and odd nonlinear coherent states, respectively. The nonclassical properties of some related states are studied. 相似文献
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本文扼要地介绍了光子数态、热光场态、相干态、压缩态、相位态和中间态等。重点是介绍它们的物理性质。例如,指出相干态在谐振子座标表象中的表示就是带电谐振子在均匀电场中的基态波函数;它的时间演化波包的概率密度分布,形状不随时间变但中心位置随时间作周期振荡。文中对相干态和压缩态等提供了也许是一点新的看法：将相干态、压缩真空态、压缩相干态和相干压缩态等看作是一准玻色子的基态或相干态。而实现的手段可以是原来的幺正算符也可以是投影算符。这样的好处是：（１）对相干态和压缩态间的联系有更深的认识;（２）便于计算和进一步展开等等。文中还对各个态的压缩性、统计性等作了介绍,有的还用图表等演示了它们的非类经典特性。最后,文中还介绍了准概率分布函数、相空间技术以及它们的应用并给出了示例 相似文献
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压缩奇偶相干态的量子统计性质 总被引：8，自引：2，他引：6
用压缩算子作用在奇偶相干态上即可得到压缩奇偶相干态.本文研究了这类量子态的统计特性.结果表明,压缩奇相干态和压缩偶相干态都能处于压缩状态,它们的光子亦都可能出现反聚束的现象. 相似文献