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The entropic squeezing of superposition of two arbitrary coherent states

Chinese Physics B 2008年第2期17卷 618-623页

作者：卢道明 Department of Electronic Engineering Wuyi University

In this paper the superpositions of two arbitrary coherent states ｜ψ〉 = α ｜β｜＋ be^iψ ｜mβe^iδ〉 are constructed by using the superposition principle of quantum mechanics. The entropic squeezing effects of the quantum states are studied. The numerical results indicate that the amplitudes, the ratio between the amplitudes of two coherent states, the phase difference between the two components and the relative phase of the two coefficients play important roles in the squeezing effects of the position entropy and momentum entropy.

关键词： coherent state superposition state entropy squeezing

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Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum

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Light(Science & Applications) 2017年第1期6卷 129-135页

作者： Kun Huang Hong Liu Sara Restuccia Muhammad Q Mehmood Sheng-Tao Mei Daniel Giovannini AaronDanner Miles J Padgett Jing-Hua Teng Cheng-Wei Qiu Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and ResearchSingapore 138634Singapore Department of Optics and Optical Engineering University of Science and Technology of ChinaHefei 230026China SUPA School of Physics and AstronomyUniversity of GlasgowGlasgow G128QQUK Information Technology University of the Punjab Lahore 54000Pakistan NUS Graduate School for Integrative Science and Engineering National University of SingaporeSingapore 117456Singapore The Edward S Rogers Department of Electrical and Computer Engineering University of TorontoToronto M5S 3G4Canada SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology Shenzhen UniversityShenzhen 518060China NUS Suzhou Research Institute(NUSRI) Suzhou 215123China

Quantum entanglements between integer-order and fractional-order orbital angular momentums(OAMs)have been previously ***,the entangled nature of arbitrary rational-order OAM has long been considered a myth due to the absence of an effective strategy for generating arbitrary rational-order OAM ***,we report a single metadevice comprising a bilaterally symmetric grating with an aperture,creating optical beams with dynamically controllable OAM values that are continuously varying over a rational *** to its encoded spiniform phase,this novel metagrating enables the production of an average OAM that can be increased without a theoretical limit by embracing distributed singularities,which differs significantly from the classic method of stacking phase singularities using fork *** new method makes it possible to probe the unexplored niche of quantum entanglement between arbitrarily defined OAMs in light,which could lead to the complex manipulation of microparticles,high-dimensional quantum entanglement and optical *** show that quantum coincidence based on rational-order OAM-superposition states could give rise to low cross-talks between two different states that have no significant overlap in their spiral ***,future applications in quantum communication and optical micromanipulation may be found.

关键词： metasurface nanophotonics orbital angular momentum superposition state

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Entropy and Entanglement in Master Equation of Effective Hamiltonian for Jaynes-Cummings Model

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Communications in Theoretical Physics 2009年第4期51卷 723-728页

作者： H.A.Hessian F.A.Mohammed A.-B.A.Mohamed Faculty of Science Assiut University

In this paper, we analytically solve the master equation for Jaynes-Cummings model in the dispersive regime including phase damping and the field is assumed to be initially in a superposition of coherent states. Using an established entanglement measure based on the negativity of the eigenvalues of the partially transposed density matrix we find a very strong sensitivity of the maximally generated entanglement to the amount of phase damping. Qualitatively this behavior is also reflected in alternative entanglement measures, but the quantitative agreement between different measures depends on the chosen noise model The phase decoherence for this model results in monotonic increase in the total entropy while the atomic sub-entropy keeps its periodic behaviour without any effect.

关键词： entanglement phase damping master equation superposition state

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The　superposition　of　Coherent　states　Along　a　Straight　Line　with　Thermal　Noise

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Chinese Journal of Lasers 1996年第2期 137-144页

作者： ZHU Kaicheng MA Songting TANG Huiqin HUANG Duzhi LI Xinguang (Department of Physics , Xiangtan Techer's College , Xiangtan 411201, China )(Department of Physics , Xiangtan Textile Training School , Xiangtan 411201, China)

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ＴｈｅＳｕｐｅｒｐｏｓｉｔｉｏｎｏｆＣｏｈｅｒｅｎｔＳｔａｔｅｓＡｌｏｎｇａＳｔｒａｉｇｈｔＬｉｎｅｗｉｔｈＴｈｅｒｍａｌＮｏｉｓｅ￥ＺＨＵＫａｉｃｈｅｎｇ；ＭＡＳｏｎｇｔｉｎｇ；ＴＡＮＧＨｕｉｑｉｎ；ＨＵＡＮＧＤｕｚｈｉ；ＬＩＸｉｎｇｕａｎｇ（Ｄｅ...

关键词： superposition state thermal nosie squeezing effect antibunching effect

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