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Littérature scientifique sur le sujet « Stati squeezing »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Stati squeezing"

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GIRI, DILIP KUMAR, et P. S. GUPTA. « SQUEEZING EFFECTS IN THE SUM AND DIFFERENCE OF THE FIELD AMPLITUDE IN THE RAMAN PROCESS ». Modern Physics Letters B 19, no 25 (10 novembre 2005) : 1261–76. http://dx.doi.org/10.1142/s0217984905009146.

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Sum and difference squeezing of the field amplitude are higher-order squeezing effects. These effects are studied in the Raman process under the short-time approximation based on a fully quantum mechanical approach. It is shown that for uncorrelated modes, the normal squeezing in the sum and difference-frequency field depends on the sum and difference squeezing of input field modes respectively, which can generate normal squeezing in the sum and difference-frequency field mode. All the possibilities for obtaining sum and difference squeezing in two modes and its dependence on squeezing of individual field modes are investigated. We have also shown that if the high-frequency mode is in a coherent state and the low-frequency mode is squeezed, the field state will be difference squeezed if the amplitude of the high-frequency mode is large enough; otherwise the state may or may not be difference squeezed. If both modes are squeezed, then the state may or may not be difference squeezed. These higher-order squeezing effects are useful in the production of squeezing in the Raman process.
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SEN, BISWAJIT, et SWAPAN MANDAL. « SQUEEZING EFFECTS IN THE SUM AND DIFFERENCE OF THE FIELD AMPLITUDE IN THE RAMAN PROCESS ». Modern Physics Letters B 21, no 17 (20 juillet 2007) : 1107–10. http://dx.doi.org/10.1142/s0217984907013614.

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Under the short-time approximation, Giri and Gupta1 investigated the sum and difference squeezing of the field amplitude in the Raman process. The relations between the normal squeezing and the sum and difference squeezing of the field amplitude are explicitly exhibited. They argued that the sum and difference squeezing of the field amplitude are essentially the squeezing in higher-order sense. Upon verification of the results of Giri and Gupta, we observe that the entire calculations and the conclusions thereof are misleading and baseless. To substantiate our claim, we give the correct expressions for the useful variances. Interestingly, there is no possibility of getting normal squeezing, sum squeezing and difference squeezing of the input state prepared in coherent state.
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REBOIRO, M., O. CIVITARESE et D. TIELAS. « INFORMATION ENTROPY AND SPIN-SQUEEZING IN ATOMIC THREE-LEVEL SYSTEMS ». International Journal of Modern Physics B 27, no 22 (12 août 2013) : 1350117. http://dx.doi.org/10.1142/s0217979213501178.

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We consider the problem of an atomic three-level system in interaction with a radiation field. The time evolution of the system, in atomic ladder and Λ configurations, is solved exactly assuming a coherent-state as the initial atomic state. We calculate the atomic spin-squeezing, the atomic entropy-squeezing, and their variances. We show that the spin-squeezing and the entropy-squeezing exhibit similar time dependence.
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BASHKIROV, E. K. « SQUEEZING AND AMPLITUDE-SQUARED SQUEEZING IN THE MODEL OF TWO NONIDENTICAL TWO-LEVEL ATOMS ». International Journal of Modern Physics B 21, no 02 (20 janvier 2007) : 145–57. http://dx.doi.org/10.1142/s0217979207036539.

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Squeezing and amplitude-squared squeezing for two two-level nonidentical atoms in lossless cavity has been investigated assuming the field to be initially in the coherent state. The time-dependent squeezing parameters have been calculated. The influence of the relative difference of two coupling constants on the squeezing parameters has been analyzed.
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MIR, MUBEEN A. « DIPOLE SQUEEZING OF THE ATOM IN A TWO-ATOM SYSTEM : EFFECTS OF THE SUPERPOSITION STATES ». International Journal of Modern Physics B 08, no 18 (15 août 1994) : 2525–38. http://dx.doi.org/10.1142/s0217979294001019.

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Dipole squeezing of the atom in the presence of another atom is investigated for the one-photon and two-photon transition mechanism with the initial atoms in the two-atom squeezed state and the field in a vacuum, a coherent, or a squeezed state. For a vacuum input, the degree of squeezing is shown to depend on the photon multiplicity 'm' and the superposition angles of the atoms, θ1 and θ2. One of the quadratures of the atomic polarization is found to exhibit permanent squeezing only for some nonzero values of θ1, as well as θ2. The effect of θ2 on the dipole squeezing, however, is found to be negligible for the initial field in a coherent or a squeezed state. A comparison with the dipole squeezing of a single atom is also presented.
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Zhang, Shuang-Xi, Hong-Chun Yuan et Hong-Yi Fan. « Higher order properties and Bell inequality violation for the three-mode enhanced squeezed state ». Canadian Journal of Physics 88, no 5 (mai 2010) : 349–56. http://dx.doi.org/10.1139/p10-020.

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By extending the usual two-mode squeezing operator S2 = exp[iλ(Q1P2 + Q2P1)] to the three-mode squeezing operator S3 = exp{iλ[Q1(P2 + P3) + Q2(P1 + P3) + Q3(P1 + P2)]}, we obtain the corresponding three-mode squeezed coherent state. The higher order properties of this state, such as higher order squeezing and higher order sub-Possonian photon statistics, are investigated. It is found that the new squeezed state not only can be squeezed to all even orders but also exhibits squeezing enhancement compared with the usual cases. In addition, we examine the violation of the Bell inequality for the three-mode squeezed states by using the formalism of Wigner representation.
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MIR, MUBEEN A. « SECOND-ORDER AND AMPLITUDE-SQUARED SQUEEZING OF THE TWO TWO-LEVEL ATOMS WITH SUPERPOSITION STATE PREPARATION ». International Journal of Modern Physics B 07, no 26 (30 novembre 1993) : 4439–50. http://dx.doi.org/10.1142/s0217979293003747.

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An analysis of the second-order and amplitude-squared (AS) squeezing is presented for the two atoms prepared in a two-atom squeezed state using coherent and squeezed field inputs. The system produce strong sqeezing and superposition angle (θ) is more effective for small values of average photon number [Formula: see text] as compared to that of large one. The degree of squeezing of both types increases as θ increases for coherent field input with small [Formula: see text]. Some values of θ for the initial field in a squeezed-vacuum state with any value of input squeezing can make one of the quadrature of the both types of squeezing permanently squeezed for T≥0. For the initial field in a more general squeezed state, the second-order and AS squeezing behave randomly for different values of θ.
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Dat, Tran Quang, Truong Minh Thang et Truong Minh Duc. « Non-classical properties and generation schemes of superposition of multiple-photon-added two-mode squeezed vacuum state ». Hue University Journal of Science : Natural Science 130, no 1B (29 juin 2021) : 5–12. http://dx.doi.org/10.26459/hueunijns.v130i1b.6028.

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In this paper, we study some non-classical properties and propose the generation schemes of the superposition of multiple-photon-added two-mode squeezed vacuum state (SMPA-TMSVS). Based on the Wigner function, we clarify that this state is a non-Gaussian state, while the original two-mode squeezed vacuum state (TMSVS) is a Gaussian state. Besides, the SMPA-TMSVS is sum squeezing, as well as difference squeezing. In particular, the manifestation of the sum squeezing and the difference squeezing in the SMPA-TMSVS becomes more pronounced when increasing parameters r and e. In addition, by exploiting the schemes of photon-added superposition in the usual order, we give some schemes that the SMPA-TMSVS can be generated with the higher-order photon-added superposition by using some optical devices.
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Anh, Nguyen Pham Quynh. « Generation of plasmon-polaritons in epsilon-near-zero polaritonic metamaterial ». Hue University Journal of Science : Natural Science 130, no 1B (29 juin 2021) : 35–41. http://dx.doi.org/10.26459/hueunijns.v130i1b.6180.

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In this paper, we study some non-classical properties and propose the generation schemes of the superposition of multiple-photon-added two-mode squeezed vacuum state (SMPA-TMSVS). Based on the Wigner function, we clarify that this state is a non-Gaussian state, while the original two-mode squeezed vacuum state (TMSVS) is a Gaussian state. Besides, the SMPA-TMSVS is sum squeezing, as well as difference squeezing. In particular, the manifestation of the sum squeezing and the difference squeezing in the SMPA-TMSVS becomes more pronounced when increasing parameters r and e. In addition, by exploiting the schemes of photon-added superposition in the usual order, we give some schemes that the SMPA-TMSVS can be generated with the higher-order photon-added superposition by using some optical devices.
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Ren, Gang, Jian-ming Du et Hai-jun Yu. « Nonclassical properties of the squeezing and rotating coherent state ». Canadian Journal of Physics 96, no 12 (décembre 2018) : 1365–72. http://dx.doi.org/10.1139/cjp-2017-0825.

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In this paper, we construct and investigate the nonclassical properties of the squeezing and rotating coherent state (SRCS) via a generalized squeezed operator by introducing a novel parameter r. In a particular case r = 0, SRCS reduces to the normal squeezed coherent state (SCS). The influence of r is studied in terms of squeezing and quantum statistical properties. Our results show that in the SCS not only is squeezing enhanced but also is rotated by the parameter r. Our discussion about the fidelity between SRCS and SCS shows that the fidelity values decrease with increasing parameter r. The experimental scheme for producing SRCS is also given via a self-Kerr medium and non-degenerate parametric amplifier.
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Thèses sur le sujet "Stati squeezing"

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Vezio, Paolo. « An experimental setup for quantum optomechanics ». Doctoral thesis, 2021. http://hdl.handle.net/2158/1234350.

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In the last few years cavity optomechanics experiments have achieved the significant progress of the preparation and observation of macroscopic me- chanical oscillators in non-classical states. An indicator of the oscillator non-classical proprieties is important also for applications to quantum tech- nologies. In this work, we compare two procedures minimizing the necessity of system calibrations. As first result we compare the homodyne spectra with the measurement of the motional sideband asymmetry in heterodyne spectra. Moreover, we describe and discuss a method to control the probe detuning, that is a crucial parameter for the accuracy of the latter, intrin- sically superior procedure. From it we can use the sidebands asymmetry as indicator of the quantumness of the mechanical oscillator, which is originated by the non-commutativity between the oscillator ladder operators. Starting from it the sidebands assume a peculiar shape when a parametric modula- tion is applied on a oscillator embedded in an optical cavity. A parametric effect is originated by a suitable combination of optical fields. The asymme- try shape is related to the modified system dynamics, while the asymmetric features reveal and quantify the quantum component of the squeezed oscilla- tor motion. The results show that it is possible to use the spectral shape of motional sidebands as a signature of a quantum mechanical squeezed state, without the necessity of absolute calibrations, in particular in the regime where residual fluctuations in the squeezed quadrature are reduced below the zero-point level.
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Livres sur le sujet "Stati squeezing"

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Greer, Ian, Karen Breidahl, Matthias Knuth et Flemming Larsen. Governance Implications. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198785446.003.0006.

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Marketization creates four dilemmas that lead to change in governance. (1) Cost versus quality: squeezing prices siphons resources out of services that could be used to employ qualified workers on the front line, and the prescription of services that price-based competition requires drains the capacity of providers to innovate. (2) Payment by results versus equal access to services: while payment by results is consistent with the ethos of market governance it bears the risk of “creaming and parking.” (3) User choice versus user compulsion: NPM principles of consumerism are difficult to reconcile with the principles of compulsion built into the work-first welfare state. (4) Openness/transparency and transaction costs: openness, transparency, and equal treatment require costly administrative capacity. Insourcing provides one solution by taking services out of the market, but it is not a panacea.
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Chapitres de livres sur le sujet "Stati squeezing"

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Zapoměl, J., et P. Ferfecki. « Reducing the Steady State Vibrations of Flexible Rotors by Squeezing Thin Layers of Normal and Magneto Rheological Oils ». Dans Advances in Mechanisms Design, 271–77. Dordrecht : Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5125-5_36.

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Kanak, Mehmet, et Serpil Pekdoğan. « Physical Bullying Towards Children ». Dans Advances in Social Networking and Online Communities, 309–24. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-5426-8.ch019.

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Physical abuse is the state of harming the child's body by the people around him. Scars of unknown cause, traces resulting from burning, spots due to impact on any part of the body, traces caused by a bite by another person, bruises and stains caused by squeezing with any tool, burns and scars caused by smoking cigarettes on the victim reflect physical abuse. Problems such as rumination disorders, problems in socialization, lack of self-respect, depression, fear of all situations, withdrawal behaviors, incompatibility, colic, problems in mental perception processes, and decreased academic achievement are observed in these children.
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Wastell, David, et Sue White. « Are we broken ? Fixing people (or society) in the 21st century ». Dans Blinded by Science. Policy Press, 2017. http://dx.doi.org/10.1332/policypress/9781447322337.003.0009.

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This chapter questions whether the neurological and molecular levels are the most appropriate domains to guide the actions of the State. The reductionism of such thinking creates a form of scientific “tunnel vision” dangerously constraining the direction of future inquiry. The Chapter explores the consequences of the prevailing moral and scientific settlements, demonstrating how these have shifted preferred policy responses towards those that are individualised and increasingly medicalized. A preoccupation with prevention, early intervention and the privileging of certain forms of evidence (that furnished by clinical trials, biological evidence) are squeezing out conversations about different, and potentially more desirable and sustainable, actions to make people’s lives better.
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Lodge, Martin, et Kai Wegrich. « Fiscal Squeeze in Germany : ». Dans When the Party’s Over. British Academy, 2014. http://dx.doi.org/10.5871/bacad/9780197265734.003.0008.

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Decisive fiscal squeeze might surprise observers of the German political system, insofar as party political dynamics, welfare state complexity, and intergovernmental financial arrangements are commonly said to inhibit decisive reforms. This chapter traces the fiscal squeeze carried out in post-unification Germany in the 1990s and 2000s and highlights how the politics of fiscal squeeze had damaging political consequences for the Social Democratic Party. Squeeze at the federal government level was largely about ‘natural wastage’ in staff numbers and targeted cutbacks. The welfare state witnessed considerable reform as a result of cumulating pressures resulting from unification, triggering significant political consequences. Finally, squeezing at the level of the intergovernmental fiscal transfers reflected attempts to contain fiscal pressures on local governments, and wider pressures within the system of German federalism, leading to the creation of a constitutional ‘debt brake’ on public budgets.
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Gorbachev, Sergey, Boris Gusev, Victor Kuzin, Shengli Xie et Dong Yue. « A Hybrid Method for Analysis of Multimodal Data for Establishing the Mechanism of Sorption of Oil and Petroleum Products by Natural Sorbent - Hair of Flyers of Horse Flowers ». Dans Hybrid Methods of Big Data Analysis and Applications, 73–92. Creosar Publishing, 2022. http://dx.doi.org/10.57118/creosar/978-1-915740-01-4_4.

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The economic and economic value of cattail consists of its medicinal, technical (fuel, construction, roofing, garter, wicker, cooper), as well as food, fodder, perganose, indicator, decorative and other uses. However, far from all the possibilities of using this plant have been disclosed. An interesting application of cattail is the use of its inflorescences (ears) as a sorbent when carrying out work to eliminate emergency spills of oil and oil products on the water surface. The chapter presents the results of studies on the use of the pistillate part of cattail inflorescences as an oil sorbent. A rather unique set of properties of the hairs of fly mats inflorescences of cattail - long-term buoyancy (more than 100 days), high sorption capacity, low water absorption and the possibility of multiple regeneration requires explanation and establishment of the sorption mechanism. To establish the mechanism of sorption by the sorbent - cattail inflorescences, a hybrid method for analyzing the data obtained from individual studies was used. On the basis of the hybrid method, it has been established that the sorption mechanism consists in a sequence of such processes as: dissolution of the wax layer covering the surface of an individual hair of a cattail fly; the formation of ruptures and the opening of internal cavities; stratification of individual hairs into several ribbons. Such a complex combination of processes leads to a synergistic effect that ensures high performance of the sorbent and an increase in its active surface by 30 %. The operational properties of a sorbent based on cattail inflorescences are given: density, oil capacity in static and dynamic conditions for various hydrocarbons, regeneration by mechanical squeezing, buoyancy, higher heat of combustion determined on a calorimeter IKA- WERKE C 5003 contro. The complex of the revealed properties of cattail inflorescences allows them to be effectively used when carrying out work to eliminate emergency oil and oil products spills on the water surface. For this purpose, a method of using adhesive drum devices for collecting waste sorbent from the water surface is proposed.
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Actes de conférences sur le sujet "Stati squeezing"

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Carmichael, Howard J. « Squeezing ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.wi.1.

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Braunstein, Samuel L., et Robert McLachlan. « Generalized squeezing ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.tuj3.

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We study a single mode of the radiation field subjected to ideal k-photon parametric amplification (photons created or destroyed k at a time). In an attempt to generalize ordinary squeezing (k = 2), Fisher et al.1 considered the case k > 2. They concluded that there is something seriously wrong with the evolution operator after discovering that for k > 2 its matrix elements in the number-state basis have divergent Taylor series expansions in time. We show that this divergence is due to a branch cut along the negative time axis, and we obtain useful information by treating these Taylor series as asymptotic expansions. We investigate the states generated by a k-photon paramp by calculating the evolution of the quantum O-function. We watch the vacuum evolve into a state whose O-function has k-fold symmetry. The classical behavior which corresponds to a k-photon parametric interaction is described by phase-space trajectories near an unstable fixed point. We compare the classical and quantum behavior and find that the quantum corrections smear out classical phase-space features which are smaller than allowed by the uncertainty principle. Finally, we consider the evolution of an initial coherent state which has large amplitude, and we find that a three-photon paramp generates squeezing at a rate proportional to the amplitude of the initial coherent state.
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Schumaker, Bonny L. « What is a broadband squeezed state ? » Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.fm2.

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A broadband or two-mode (nondegenerate) squeezed state is the natural two-mode analog of a single-mode (degenerate) squeezed state. The squeezing is a result of correlations between photons in the two modes. Two-mode squeezed states are produced by the same kind of physical process and the same kinds of physical device that produce single-mode squeezed states (e.g., a parametric amplifier), simply by moving away from degeneracy. They are to be contrasted with another kind of two-mode state, one produced by separately squeezing two single modes. The latter are produced by a different kind of physical process and different physical devices from those that produce two-mode squeezed states. States that are products of two single-mode squeezed states do not exhibit squeezing, for the photons in the two modes are not correlated. There is a formal sense, however, in which these different kinds of two-mode states are (unitarily) equivalent. This formal equivalence tells one that, to achieve the desired squeezing by separately squeezing two modes, one would have to use a frequency-converting device before and after squeezing the two modes separately. This process produces the required correlations, hence the squeezing, but it Is clearly not the natural way to obtain a broadband squeezed state.
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Petrucci, Laure, Michal Knapik, Wojciech Penczek et Teofil Sidoruk. « Squeezing State Spaces of (Attack-Defence) Trees ». Dans 2019 24th International Conference on Engineering of Complex Computer Systems (ICECCS). IEEE, 2019. http://dx.doi.org/10.1109/iceccs.2019.00015.

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Yi Huo, Wen, Gui Lu Long, Hsi-Sheng Goan et Yueh-Nan Chen. « Entanglement and Squeezing in Solid State Circuits ». Dans SOLID-STATE QUANTUM COMPUTING : Proceedings of the 2nd International Workshop on Solid-State Quantum Computing & Mini-School on Quantum Information Science. AIP, 2008. http://dx.doi.org/10.1063/1.3037131.

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Molinares, Hugo, Vitalie Eremeev et Miguel Orszag. « Steady-state squeezing transfer in hybrid optomechanics ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2021. http://dx.doi.org/10.1364/fio.2021.jtu1a.83.

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Sarkar, Resham, Minchuan Zhou, Renpeng Fang et Selim M. Shahriar. « Effect of Spin Squeezing Followed by Anti-Squeezing in a Collective State Atomic Clock ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2016. http://dx.doi.org/10.1364/fio.2016.jth2a.16.

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Kim, Chonghoon, Ruo-Ding Li et Prem Kumar. « Spatial effects in traveling-wave squeezed-state generation and detection ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.wii.3.

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Recent experiments that have demonstrated the generation of quadrature-squeezed light in the traveling-wave configuration of an optical parametric amplifier (OPA) indicate that the observable squeezing is largely limited by the effects of diffraction in the parametric process1 and by the spatio-temporal mismatch between the generated squeezed mode and the local-oscillator (LO) mode employed in homodyne detection of squeezing.2
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Yurke, B. « Squeezed-coherent State Generation via Wideband Four-wave Mixers ». Dans Instabilities and Dynamics of Lasers and Nonlinear Optical Systems. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/idlnos.1985.wd21.

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Four-wave mixers have been investigated theoretically as potential sources of squeezed-coherent radiation 1,2 and there are a number of experimental efforts underway to demonstrate the production of squeezed-coherent radiation via such devices.3,4,5 Here the results of some wideband calculations of the output of cavity four-wave mixers is presented. The wideband squeezed-coherent radiation generated by such devices may be detected via a wideband homodyne detector.6 Wideband squeezing will manifest itself in the noise-power spectrum of the homodyne detector's output as regions where the noise is reduced below the level that is observed when no light enters the input port of the homodyne detector. Wideband homodyne detection allows one to look for squeezing at frequencies far from d.c. This gives the experimentalist the freedom to look for squeezing in the frequency range where his detector performs best.
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Shelby, R. M., et Marc D. Levenson. « Bistability, nondegenerate four-wave mixing and squeezed state generation in a single-mode fiber ring resonator ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.wj16.

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In optical fibers, nonlinear dispersion due to the same third-order susceptibility as that responsible for parametric mixing significantly alters the squeezing behavior in a traveling wave geometry, giving the squeezed quadrature an intensity dependent phase and reducing the overall squeezing. Phase noise is not squeezed at all. In the case of a fiber ring resonator, the nonlinear susceptibility will also lead to dispersive optical bistability and the squeezing will be strongly dependent on pump and sideband detuning. Yurke1 has analyzed squeezing due to backward four-wave mixing in a cavity, but the pump wave did not circulate in the cavity, and bistability was not dealt with. We have developed a theory of the resonant fiber ring interferometer, where the pump wave is near resonance with an interferometer mode and the circulating power is thereby enhanced. For perfect pump resonance and for frequencies corresponding to sideband resonance, the overall enhancement of the squeezing in the output mode compared to the traveling wave case is proportional to the square of the resonator finesse. The best squeezing in the output mode is always found for this condition of sideband resonance. The phase of the minimum noise quadrature is quite sensitive to both pump and sideband detuning. This feature may provide a means for avoiding excess thermal phase noise due to guided acoustic wave Brillouin scattering in the fiber itself. At the critical points for dispersive optical bistability in such a resonator and for sideband resonance (i.e., noise frequencies which are multiples of the resonator free spectral range), perfect squeezing of the output light is predicted. This result was also obtained previously for the case of degenerate mixing in a resonant cavity by Collett and Walls.2 Our current theory does not account for the reduction in squeezing due to the loss present in such a resonator.2 Since the loss is also enhanced by a factor of the resonator finesse, this is of some concern and will limit the maximum useful finesse for quantum noise squeezing. The major source of loss is the single-mode directional coupler, which for currently available technology is of the order of a few percent.
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