检索结果-南通市图书馆

Chinese Physics B 2021年第7期30卷 253-260页

作者：王志远张子静赵远 Department of Physics Harbin Institute of TechnologyHarbin 150001China

The precision measurement of Doppler frequency shifts is of great significance for improving the precision of speed *** paper proposes a precision measurement scheme of tiny Doppler shifts by a parametric amplification process and squeezed vacuum *** scheme takes a parametric amplification process and squeezed vacuum state into a detection system,so that the measurement precision of tiny Doppler shifts can exceed the Cram′er–Rao bound of coherent ***,a simulation study is carried out on the theoretical basis,and the following results are obtained:for the signal light of Gaussian mode,when the amplification factor g=1 and the squeezed factor r=0.5,the measurement error of Doppler frequency shifts is 14.4%of the Cramer–Rao bound of the coherent light in our *** the same time,when the local light mode and squeezed vacuum state mode are optimized,the measurement precision of this scheme can be further improved by√(2n+1)/(n+1)times,where n is the mode-order of the signal light.

关键词： squeezed vacuum state quantum metrology

Scheme for generating a cluster-type entangled squeezed vacuum state via cavity QED

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第4期23卷 98-101页

作者：文晶姬 Yeon Kyu-Hwang 王洪福张寿 Department of Physics College of Natural Science Chungbuk National University Department of Physics College of Science Yanbian University

A scheme is proposed to generate an N-qubit cluster-type entangled squeezed vacuum state （CTESVS） based on the two-photon interaction between a two-level atomand the cavity fields with the cavity QED system. The CTESVS in N separate cavities can be effectively obtained after performing a simple one-qubit measurement on the atom. The influence of cavity decay on the CTESVS is also discussed.

关键词： cluster state squeezed vacuum state quantum entanglement cavity QED

Amplitude Nth-power Squeezings in a Normal squeezed vacuum state

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1996年第1期 61-66页

作者： ZHANG Z. M.(Department of Physics, Xi’an Jiaotong Unitersity, Xi’an 710049, China)XU L.(Institute of Nuclear Reasarch, Academia Sinica, Shanghai 201800, China)HE L. S.(Institute of Optics and Fine Mechanics, Academia Sinica, Hefei 230031, China)MA A. Q.(H

In this paper we examine the amplitude Nth-power squeezing in a normal squeezed vacuum. The results show that the different Nth-power squeezings are independent nonclassical features of a radiation field. The dependen... 详细信息

关键词： squeezed vacuum state amplitude-Nth-power squeezing

Arbitrated quantum signature scheme with continuous-variable squeezed vacuum states

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第2期27卷 239-248页

作者：冯艳艳施荣华郭迎 School of Information Science and Engineering Central South University

We propose an arbitrated quantum signature （AQS） scheme with continuous variable （CV） squeezed vacuum states, which requires three parties, i.e., the signer Alice, the verifier Bob and the arbitrator Charlie trusted by Alice and Bob, and three phases consisting of the initial phase, the signature phase and the verification phase. We evaluate and compare the original state and the teleported state by using the fidelity and the beam splitter （BS） strategy. The security is ensured by the CV-based quantum key distribution （CV-QKD） and quantum teleportation of squeezed states. Security analyses show that the generated signature can be neither disavowed by the signer and the receiver nor counterfeited by anyone with the shared keys. Furthermore, the scheme can also detect other manners of potential attack although they may be successful. Also, the integrality and authenticity of the transmitted messages can be guaranteed. Compared to the signature scheme of CV-based coherent states, our scheme has better encoding efficiency and performance. It is a potential high-speed quantum signature scheme with high repetition rate and detection efficiency which can be achieved by using the standard off-the-shelf components when compared to the discrete-variable （DV） quantum signature scheme.

关键词： arbitrated quantum signature squeezed vacuum state continuous variable quantum teleportation

Generation of cluster-type entangled squeezed vacuum states

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2008年第5期17卷 1618-1622页

作者：文晶姬邵晓强金星日张寿 Yeon Kyu-Hwang Department of Physics College of Science Yanbian University Center for the Condensed-Matter Science and Technology Harbin Institute of Technology BK21 Program Physics and Department of Physics College of Natural Science Chungbuk National University

We present a scheme to prepare cluster-type entangled squeezed vacuum states （CTESVS） by considering the two-photon interaction between a two-level atom and a high-quality cavity, driven by a strong classical field. After the realization of simple atomic measurements, the generation of CTESVS in four separate cavities is accomplished within the cavity decay time. In the case of large atom=cavity detuning, the scheme is immune to the effect of atomic spontaneous emission.

关键词： cluster state squeezed vacuum state quantum entanglement

Quantum teleportation of entangled squeezed vacuum states

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2003年第10期12卷 1066-1069页

作者：蔡新华 DepartmentofPhysicsandElectronics HunanUniversityofArtsandScienceChangde415000China

An optical scheme for probabilistic teleporting entangled squeezed vacuum states (SVS) is proposed. In this scheme,the teleported state is a bipartite entangled SVS,and the quantum channel is a tripartite entangled *** process of the teleportation is achieved by using a 50/50 symmetric beamsplitter and photon detectors with the help of classical information.

关键词： quantum teleportation squeezed vacuum state beamsplitter detection of photon

Evolution of a two-mode squeezed vacuum in the amplitude dissipative channel

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2011年第12期20卷 43-46页

作者：姜年权范洪义席留生唐龙英袁先漳 College of Physics and Electric Information Wenzhou University Department of Physics Shanghai Jiao Tong University College of Foreign Languages Wenzhou University

For the first time we derive the dissipating result of an initial two-mode squeezed pure vacuum state passing through a two-mode amplitude dissipative channel described by the direct product of two independent single-mode master equations. Although these two master equations do not mix the two modes （there is no coupling between them）, since the two-mode squeezed state is simultaneously an entangled state, the final state which emerges from passing this channel is a two-mode mixed density operator. The compact expression of the outcoming state is obtained, which manifestly shows that as time evolves, the squeezing effect decreases.

关键词： squeezed vacuum state dissipative channel master equation

Dynamics of Nonclassicality of Time-and Conductivity-Dependent squeezed states and Excited Even/Odd Coherent states

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2017年第4期67卷 365-376页

作者： R.Daneshmand M.K.Tavassoly Atomic and Molecular Group Faculty of PhysicsYazd UniversityYazdIran Photonics Research Group Engineering Research CenterYazd UniversityYazdIran The Laboratory of Quantum Information Processing Yazd UniversityYazdIran

Recently, the quantum description of electromagnetic waves in conducting media has been performed. It has been demonstrated that in particular case, the Hamiltonian of the corresponding field can be expressed by Caldirola–Kanai Hamiltonian. In this paper, using the associated annihilation and creation operators of the above-mentioned quantized field, the time-and conductivity-dependent squeezed vacuum and one-photon squeezed states as well as their superpositions, and also the time-and conductivity-dependent excited even and odd coherent states are produced. Also,using a few well-known nonclassicality criteria, the time evolution of nonclassicality features of the above classes of obtained states, in addition to the influence of medium conductivity on them are demonstrated, numerically. It has been shown that the nonclassicality indicators may be adjusted by tuning the conductivity of media.

关键词： Caldirola–Kanai Hamiltonian squeezed vacuum state one-photon squeezed state excited even coherent state excited odd coherent state

Interaction of two two-level atoms with SU (1, 1 ) coherent states

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1994年第6期B3卷 521-528页

作者： SONG Tongqiang FENG Jian WANG Wenzheng XU Jingzhi(l) Institufe of Optical Communicafion, Uaocbeng Teacborsl College,Shandong 252059, China)(2) Department of Physics, tiaocbong Teacborsl College,Shandong 252059, China) Liaocheng Teachers' Coll Liaocheng China

Ｉｎｔｅｒａｃｔｉｏｎｏｆｔｗｏｔｗｏ－ｌｅｖｅｌａｔｏｍｓｗｉｔｈＳＵ（１，１）ｃｏｈｅｒｅｎｔｓｔａｔｅｓ￥ＳＯＮＧＴｏｎｇｑｉａｎｇ；ＦＥＮＧＪｉａｎ；ＷＡＮＧＷｅｎｚｈｅｎｇ；ＸＵＪｉｎｇｚｈｉ... 详细信息

Ｉｎｔｅｒａｃｔｉｏｎｏｆｔｗｏｔｗｏ－ｌｅｖｅｌａｔｏｍｓｗｉｔｈＳＵ（１，１）ｃｏｈｅｒｅｎｔｓｔａｔｅｓ￥ＳＯＮＧＴｏｎｇｑｉａｎｇ；ＦＥＮＧＪｉａｎ；ＷＡＮＧＷｅｎｚｈｅｎｇ；ＸＵＪｉｎｇｚｈｉ（ｌ）ＩｎｓｔｉｔｕｆｅｏｆＯｐｔ...

关键词： coherent state squeezed vacuum state two--photon TC model