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High-sensitivity phase estimation with a two-mode squeezed coherent state based on a Mach–Zehnder interferometer 认领 引用
1
作者 Pengxiang Ruan Jun Liu +3 位作者 Chenlu Li Qingli Jing Mingming Zhang Dong-Xu Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第2期389-400,共12页
A scheme is proposed based on a Mach-Zehnder interferometer with high phase sensitivity,utilizing a two-mode squeezed coherent state,generated by four-wave mixing,as input.The phase sensitivity of this scheme easily s... A scheme is proposed based on a Mach-Zehnder interferometer with high phase sensitivity,utilizing a two-mode squeezed coherent state,generated by four-wave mixing,as input.The phase sensitivity of this scheme easily surpasses the Heisenberg limit when intensity difference detection is applied.Under phase-matching conditions,the quantum Cramér-Rao bound significantly exceeds the Heisenberg limit.Additionally,the scheme exhibits robustness against photon loss.When compared with the modified SU(1,1)interferometer with two coherent state inputs,this approach demonstrates superior measurement sensitivity,evaluated through various detection methods and the quantum Cramér-Rao bound.This work holds potential applications in quantum metrology. 展开更多
关键词 two-mode squeezed coherent state phase estimation quantum Cramér–Rao bound Heisenberg limit
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Nonlinear two-mode squeezing obtained by analysing two-mode exponential quadrature operators in entangled state representation 认领 引用
2
作者 刘堂昆 单传家 +1 位作者 刘继兵 范洪义 《Chinese Physics B》 SCIE EI CAS 2010年第9期118-122,共5页
By analysing the properties of two-mode quadratures in an entangled state representation （ESR） we derive from ESR some complicated exponential quadrature operators for nonlinear two-mode squeezing, which directly le... By analysing the properties of two-mode quadratures in an entangled state representation （ESR） we derive from ESR some complicated exponential quadrature operators for nonlinear two-mode squeezing, which directly leads to wave function of the nonlinear squeezed state in ESR. 展开更多
关键词 nonlinear two-mode squeezing two-mode exponential quadrature operators entangled state representation
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Dissipation of a two-mode squeezed vacuum state in the single-mode amplitude damping channel 认领 引用
3
作者 周南润 胡利云 范洪义 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第12期38-42,共5页
We explore how a two-mode squeezed vacuum state sechθeab tanh θ[00） evolves when it undergoes a single- mode amplitude dissipative channel with rate of decay k. We find that in this process not only the squeezing p... We explore how a two-mode squeezed vacuum state sechθeab tanh θ[00） evolves when it undergoes a single- mode amplitude dissipative channel with rate of decay k. We find that in this process not only the squeezing parameter decreases, tanhθ → e-kt tanh θ, but also the second-mode vacuum state evolves into a chaotic state exp{bbln[（1 - e-2kt） tanh2 θ]}. The outcome state is no more a pure state, but an entangled mixed state. 展开更多
关键词 amplitude dissipative channel two-mode squeezed vacuum state two-mode entangled state quantum communication
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New theorem relating two-mode entangled tomography to two-mode Fresnel operator 认领 引用
4
作者 Xie Chuan-Mei Fan Hong-Yi 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第1期62-67,共6页
Based on the Fan-Hu＇s formalism, i.e., the tomogram of two-mode quantum states can be considered as the module square of the states＇ wave function in the intermediate representation, which is just the eigenvector of... Based on the Fan-Hu＇s formalism, i.e., the tomogram of two-mode quantum states can be considered as the module square of the states＇ wave function in the intermediate representation, which is just the eigenvector of the Fresnel quadrature phase, we derive a new theorem for calculating the quantum tomogram of two-mode density operators, i.e., the tomogram of a two-mode density operator is equal to the marginal integration of the classical Weyl correspondence function of Fl2pF2, where F2 is the two-mode Fresnel operator. An application of the theorem in evaluating the tomogram of an optical chaotic field is also presented. 展开更多
关键词 two-mode quantum tomogram two-mode Fresnel operator Weyl correspondence
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Coordinate-Dependent Two-Mode Squeezing Transformations and the Corresponding Squeezed States 认领 引用
5
作者 SONG Tong-Qiang 《Communications in Theoretical Physics》 SCIE CAS 2007年第2期325-329,共5页
We introduce the coordinate-dependent two-mode squeezing transformations and discuss the properties of the corresponding two-mode squeezed states.
关键词 coordinate-dependent two-mode squeezing transformation two-mode squeezed states
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Nonclassical properties in the resonant interaction of a three level ∧-type atom with two-mode field in coherent state 认领 引用 被引量：23
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作者 吴怀志 苏万钧 《Chinese Physics B》 CAS 2007年第1期106-110,共5页
In this paper, we study the nonclassical properties of the electromagnetic field resulting from the interaction of a three-level ∧-type atom with a two-mode field initially in the coherent state, such as squeezing pr... In this paper, we study the nonclassical properties of the electromagnetic field resulting from the interaction of a three-level ∧-type atom with a two-mode field initially in the coherent state, such as squeezing properties and sub-Poisson statistics. We show that the squeezing can be enhanced by selective atomic measurement. 展开更多
关键词 resonant interaction selective atomic measurement two-mode squeezing
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Entanglement of two atoms in two-mode Raman coupled model with intrinsic decoherence 认领 引用 被引量：6
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作者 张剑 邵彬 邹健 《Chinese Physics B》 SCIE EI CAS 2009年第12期5179-5188,共10页
Considering intrinsic decoherence, the two-atom two-mode Raman coupled model is investigated in this paper. Utilizing the constants of motion in this model, we obtain the analytic expressions of the density operator o... Considering intrinsic decoherence, the two-atom two-mode Raman coupled model is investigated in this paper. Utilizing the constants of motion in this model, we obtain the analytic expressions of the density operator of the system for investigating the entanglement of two atoms. The speed of entanglement decay increases with the increasing of the coupling coefficient of one atom. The difference between the oscillation periods when the initial state parameter of atomic subsystem belongs to two intervals becomes smaller with the increasing of the coupling coefficient of one atom. The increasing of the initial photon number of the second field can hasten the vanishing of entanglement of atomic subsystem. The robustness of atomic entanglement against decoherence depends on the interval of the initial state parameter of atomic subsystem. 展开更多
关键词 entanglement intrinsic decoherence two-atom two-mode Raman coupled model
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Two-Mode Converters at 1.3μm Based on Multimode Interference Couplers on InP Substrates 认领 引用 被引量：2
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作者 郭菲 陆丹 +3 位作者 张瑞康 王会涛 王圩 吉晨 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第2期39-42,共4页
Two-mode converters at 1.3μm, aiming at applications in mode-division multiplexing in Ethernet systems, are proposed and experimentally demonstrated. Based on multimode interference couplers, the two-mode converters ... Two-mode converters at 1.3μm, aiming at applications in mode-division multiplexing in Ethernet systems, are proposed and experimentally demonstrated. Based on multimode interference couplers, the two-mode converters with 50% and 66% mode conversion efficiencies are designed and fabricated on InP substrates. AIode conver- sion from the fundamental mode （TEo） to the first order mode （TE1） is successfully demonstrated within the wavelength range of 1280-1320nm. The 1.3-μm mode converters should be important devices in mode-division multiplexing systems in Ethernet systems. 展开更多
关键词 mode InP Two-Mode Converters at 1.3 m Based on Multimode Interference Couplers on InP Substrates of in TE on
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Quantum metrology with two-mode squeezed thermal state: Parity detection and phase sensitivity 认领 引用 被引量：2
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作者 李恒梅 徐学翔 +1 位作者 袁洪春 王震 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第10期157-163,共7页
Based on the Wigner-function method, we investigate the parity detection and phase sensitivity in a Mach–Zehnder interferometer(MZI) with two-mode squeezed thermal state(TMSTS). Using the classical transformation rel... Based on the Wigner-function method, we investigate the parity detection and phase sensitivity in a Mach–Zehnder interferometer(MZI) with two-mode squeezed thermal state(TMSTS). Using the classical transformation relation of the MZI, we derive the input–output Wigner functions and then obtain the explicit expressions of parity and phase sensitivity.The results from the numerical calculation show that supersensitivity can be reached only if the input TMSTS have a large number photons. 展开更多
关键词 Mach–Zenhder interferometer two-mode squeezed thermal state Wigner function phase sensitivity
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The q-analogues of two-mode squeezed states constructed by virtue of the IWOP technique 认领 引用 被引量：4
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作者 孟祥国 王继锁 李洪奇 《Chinese Physics B》 SCIE EI CAS 2008年第8期2973-2978,共6页
The q-analogues of two-mode squeezed states are introduced by virtue of deformation quantization methods and the technique of integration within an ordered product （IWOP） of operators. Some new completeness relation... The q-analogues of two-mode squeezed states are introduced by virtue of deformation quantization methods and the technique of integration within an ordered product （IWOP） of operators. Some new completeness relations about these squeezed states composed of the bra and ket which are not mutually Hermitian conjugates are obtained. Furthermore, the antibunching effects of the two-mode squeezed vacuum state S＇s（τ） │00） are investigated. It is found that, in different ranges of the squeezed parameter τ, both modes of the state exhibit the antibunching effects and the two modes of the state are always nonclassical correlation. 展开更多
关键词 q-analogue of two-mode squeezed state IWOP technique completeness relation anti-bunching effect
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Two-mode intelligent coordinating control of position for the welding positioner 认领 引用 被引量：4
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作者 樊丁 周万坤 谭伟明 《China Welding》 EI CAS 1998年第1期50-55,共6页
A new intelligent control method for welding positioner is proposed. Applying an improved fuzzy controller and a variable PID controller, a two-mode intelligent coordinating controller ( TMICC ) is designed on basis o... A new intelligent control method for welding positioner is proposed. Applying an improved fuzzy controller and a variable PID controller, a two-mode intelligent coordinating controller ( TMICC ) is designed on basis of fuzzy logic and rules. The simulation and experimental results show that this control system can obtain better dynamic and static characteristics. 展开更多
关键词 AC servo position control two-mode coordinating controller fuzzy control welding positioner
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Detaching two single-mode squeezing operators from the two-mode squeezing operator 认领 引用 被引量：4
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作者 范洪义 笪诚 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第9期222-224,共3页
It has been common knowledge that the single-mode squeezing operator and the two-mode squeezing operator are independent of each other. However, in this work we find that after using the technique of integration with... It has been common knowledge that the single-mode squeezing operator and the two-mode squeezing operator are independent of each other. However, in this work we find that after using the technique of integration within Ω-ordering and β-ordering, we can detach two single-mode squeezing operators from the two-mode squeezing operator. In other words, we show that the two-mode squeezing operator can be split into a β-ordered two-mode squeezing operator （with a new squeezing parameter） and two single-mode squeezing operators （with another squeezing parameter）. This tells us that the two-mode squeezing mechanism also involves some single-mode squeezing. 展开更多
关键词 Ω-ordering and β-ordering single-mode and two-mode squeezing operators detaching
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Entropy squeezing for a two-level atom in two-mode Raman coupled model with intrinsic decoherence 认领 引用 被引量：2
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作者 张剑 邵彬 邹健 《Chinese Physics B》 SCIE EI CAS 2009年第4期1517-1527,共11页
In this paper, we investigate the entropy squeezing for a two-level atom interacting with two quantized fields through Raman coupling. We obtain the dynamical evolution of the total system under the influence of intri... In this paper, we investigate the entropy squeezing for a two-level atom interacting with two quantized fields through Raman coupling. We obtain the dynamical evolution of the total system under the influence of intrinsic decoherence when the two quantized fields are prepared in a two-mode squeezing vacuum state initially. The effects of the field squeezing factor, the two-level atomic transition frequency, the second field frequency and the intrinsic decoherence on the entropy squeezing are discussed. Without intrinsic decoherence, the increase of field squeezing factor can break the entropy squeezing. The two-level atomic transition frequency changes only the period of oscillation but not the strength of entropy squeezing. The influence of the second field frequency is complicated. With the intrinsic decoherence taken into consideration, the results show that the stronger the intrinsic decoherence is, the more quickly the entropy squeezing will disappear. The increase of the atomic transition frequency can hasten the disappearance of entropy squeezing. 展开更多
关键词 entropy squeezing intrinsic decoherence two-mode Raman coupled model
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Multiple-Photon-Added and-Subtracted Two-Mode Binomial States: Nonclassicality and Entanglement 认领 引用 被引量：1
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作者 Kai-Cai Li Xiang-Guo Meng Ji-Suo Wang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2019年第7期807-812,共6页
We theoretically analyze the nonclassicality and entanglement of two new non-Gaussian entangled states generated by applying multiple-photon addition and subtraction to a two-mode binomial state.The nonclassical prope... We theoretically analyze the nonclassicality and entanglement of two new non-Gaussian entangled states generated by applying multiple-photon addition and subtraction to a two-mode binomial state.The nonclassical properties are investigated in terms of the partial negativity of the Wigner functions,whose results show that their nonclassicality can be enhanced via one-mode even-number photon operations and two-mode symmetrical operations for the initial two-mode binomial state.We also find that there exists some enhancement in the entanglement properties in certain parameter ranges via one-mode photon-addition and two-mode symmetrical operations. 展开更多
关键词 two-mode binomial st ate photon addition and subtraction nonclassicality entanglement
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Security of quantum key distribution using two-mode squeezed states against optimal beam splitter attack 认领 引用 被引量：1
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作者 何广强 朱思维 +1 位作者 郭红斌 曾贵华 《Chinese Physics B》 SCIE EI CAS 2008年第4期1263-1268,共6页
For the beam splitter attack strategy against quantum key distribution using two-mode squeezed states, the analytical expression of the optimal beam splitter parameter is provided in this paper by applying the Shannon... For the beam splitter attack strategy against quantum key distribution using two-mode squeezed states, the analytical expression of the optimal beam splitter parameter is provided in this paper by applying the Shannon information theory. The theoretical secret information rate after error correction and privacy amplification is given in terms of the squeezed parameter and channel parameters. The results show that the two-mode squeezed state quantum key distribution is secure against an optimal beam splitter attack. 展开更多
关键词 quantum key distribution two-mode squeezed states optimal beam splitter attack
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Preparation and control of entangled states in the two-mode coherent fields interacting with a moving atom via two-photon process 认领 引用 被引量：1
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作者 刘小娟 周并举 +1 位作者 刘明伟 李寿存 《Chinese Physics B》 CAS 2007年第12期3685-3691,共7页
We investigate the preparation and the control of entangled states in a system with the two-mode coherent fields interacting with a moving two-level atom via the two-photon transition. We discuss entanglement properti... We investigate the preparation and the control of entangled states in a system with the two-mode coherent fields interacting with a moving two-level atom via the two-photon transition. We discuss entanglement properties between the two-mode coherent fields and a moving two-level atom by using the quantum reduced entropy, and those between the two-mode coherent fields by using the quantum relative entropy. In addition, we examine the influences of the atomic motion and field-mode structure parameter p on the quantum entanglement of the system. Our results show that the period and the duration of the prepared maximal atom-field entangled states and the frequency of maximal two-mode field entangled states can be controlled, and that a sustained entangled state of the two-mode field, which is independent of atomic motion and the evolution time, can be obtained, by choosing appropriately the parameters of atomic motion, field-mode structure, initial state and interaction time of the system. 展开更多
关键词 two-mode coherent fields entangled states reduced entropy relative entropy atomic motion and field-mode structure
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Generation and Properties of Two-Mode Circular States 认领 引用 被引量：2
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作者 ZHANG Ke-Fu WANG Zhong-Jie 《Communications in Theoretical Physics》 SCIE CAS 2008年第11期1101-1104,共4页
Two-mode circular states,which are superposition states from some two-mode coherent states,are studiedtheoretically.It is shown that under certain conditions two-mode circular states may exhibit nonclassical effects,s... Two-mode circular states,which are superposition states from some two-mode coherent states,are studiedtheoretically.It is shown that under certain conditions two-mode circular states may exhibit nonclassical effects,suchas sub-Poissonian statistics and intermode correlation.We propose schemes to generate two-mode circular states by theinteraction of a trapped ion with traveling wave lasers. 展开更多
关键词 two-mode circular states nonclassical properties trapped ion
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New formulas for normalizing photon-added(-subtracted) two-mode squeezed thermal states 认领 引用 被引量：1
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作者 胡利云 范洪义 张智明 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第3期312-316,共5页
For the first time,we derive the compact forms of normalization factors for photon-added（-subtracted） two-mode squeezed thermal states by using the P-representation and the integration within an ordered product of o... For the first time,we derive the compact forms of normalization factors for photon-added（-subtracted） two-mode squeezed thermal states by using the P-representation and the integration within an ordered product of operators（IWOP） technique.It is found that these two factors are related to the Jacobi polynomials.In addition,some new relationships for Jacobi polynomials are presented. 展开更多
关键词 two-mode squeezed thermal states normalization photon addition and subtraction integration within an ordered product of operators technique
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Two-Mode Excited Squeezed Vacuum State and Its Properties 认领 引用 被引量：1
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作者 MENG Xiang-Guo WANG Ji-Suo LIANG Bao-Long 《Communications in Theoretical Physics》 SCIE CAS 2008年第5期1299-1304,共6页
In this paper,the two-mode excited squeezed vacuum state(TESVS)is studied by using the statistical method.By calculating the normalization of the TESVS,a new form of Jacobi polynomials and some new identities are obta... In this paper,the two-mode excited squeezed vacuum state(TESVS)is studied by using the statistical method.By calculating the normalization of the TESVS,a new form of Jacobi polynomials and some new identities are obtained.The photon number distribution of the TESVS is given and it is a simple form of Jacobi polynomials.Using the entangled state representation of Wigner operator,the Wigner function of the TESVS is obtainded and the variations of the Wigner function with the parameters m,n,and r are discussed.Here from the phase space point of view the TESVS can be well interpreted and described. 展开更多
关键词 two-mode excited squeezed vacuum state photon number distribution Wigner function entangled state representation
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The two-mode quantum Fresnel operator and the multiplication rule of 2D Collins diffraction formula 认领 引用 被引量：2
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作者 谢传梅 范洪义 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第4期296-300,共5页
By using the two-mode Fresnel operator we derive a multiplication rule of two-dimensional （2D） Collins diffraction formula, the inverse of 2D Collins diffraction integration can also be conveniently derived in this ... By using the two-mode Fresnel operator we derive a multiplication rule of two-dimensional （2D） Collins diffraction formula, the inverse of 2D Collins diffraction integration can also be conveniently derived in this way in the context of quantum optics theory. 展开更多
关键词 2D Collins diffraction formula two-mode Fresnel operator
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