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Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics最新文献

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Beyond the usual approximations: Time-dependent magnetic traps revisited 超越通常的近似:时间相关的磁阱重新审视
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 Epub Date: 2001-06-08 DOI: 10.1016/S1296-2147(01)01188-X
J.H. Müller, O. Morsch, D. Ciampini, M. Anderlini, R. Mannella, E. Arimondo
{"title":"Beyond the usual approximations: Time-dependent magnetic traps revisited","authors":"J.H. Müller,&nbsp;O. Morsch,&nbsp;D. Ciampini,&nbsp;M. Anderlini,&nbsp;R. Mannella,&nbsp;E. Arimondo","doi":"10.1016/S1296-2147(01)01188-X","DOIUrl":"10.1016/S1296-2147(01)01188-X","url":null,"abstract":"<div><p>The motion of atoms in time-orbiting potential (TOP) traps is usually described by applying adiabatic and time-averaging approximations. In this work we show that careful experimental analysis reveals corrections to both of these approximations in the shape of a micromotion of the atoms at the frequency of the time-dependent trapping field and of a dependence of the equilibrium position of the atoms on the sense of rotation of the bias field. Whereas the former can be easily explained theoretically, the latter requires a more sophisticated analytical treatment involving geometric forces. We present experimental results and numerical simulations which agree well with the data. Furthermore, implications for Bose–Einstein condensation experiments are discussed.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 649-656"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01188-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90887264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Coherent manipulation and guiding of Bose–Einstein condensates by optical dipole potentials 光偶极势对玻色-爱因斯坦凝聚体的相干操纵和引导
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 Epub Date: 2001-06-08 DOI: 10.1016/S1296-2147(01)01201-X
K. Bongs, S. Burger, S. Dettmer, D. Hellweg, J. Arlt, W. Ertmer, K. Sengstock
{"title":"Coherent manipulation and guiding of Bose–Einstein condensates by optical dipole potentials","authors":"K. Bongs,&nbsp;S. Burger,&nbsp;S. Dettmer,&nbsp;D. Hellweg,&nbsp;J. Arlt,&nbsp;W. Ertmer,&nbsp;K. Sengstock","doi":"10.1016/S1296-2147(01)01201-X","DOIUrl":"10.1016/S1296-2147(01)01201-X","url":null,"abstract":"<div><p>The coherent manipulation of Bose–Einstein condensates by far blue detuned optical dipole potentials is discussed in two regimes. The local manipulation of the phase of the condensate wavefunction by temporally applied dipole potentials represents a powerful tool for the design of matter waves. We use this method in particular for the creation of dark solitons in Bose–Einstein condensates and study their dynamics. Spatially inhomogeneous dipole potentials like far blue detuned doughnut laser beams can be used for the creation of Bose–Einstein condensates within a waveguide structure.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 671-680"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01201-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82143065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Time-domain Ramsey interferometry with Bose–Einstein condensates 玻色-爱因斯坦凝聚的时域拉姆齐干涉测量
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 Epub Date: 2001-06-08 DOI: 10.1016/S1296-2147(01)01197-0
F. Minardi , C. Fort , P. Maddaloni , M. Modugno , M. Inguscio
{"title":"Time-domain Ramsey interferometry with Bose–Einstein condensates","authors":"F. Minardi ,&nbsp;C. Fort ,&nbsp;P. Maddaloni ,&nbsp;M. Modugno ,&nbsp;M. Inguscio","doi":"10.1016/S1296-2147(01)01197-0","DOIUrl":"10.1016/S1296-2147(01)01197-0","url":null,"abstract":"<div><p>We report on the observation of time-domain interference with Bose–Einstein condensates, by means of a double separated oscillator technique. We discuss the decay of the Ramsey oscillations amplitude, that in our system occurs on a time scale of tens of microseconds. To elucidate the origin of this fast decay, we compare the behaviour of a condensate with that of a thermal cloud.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 605-612"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01197-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74273968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 Epub Date: 2001-06-08 DOI: 10.1016/S1296-2147(01)01221-5
Alain Aspect, Jean Dalibard
{"title":"","authors":"Alain Aspect,&nbsp;Jean Dalibard","doi":"10.1016/S1296-2147(01)01221-5","DOIUrl":"https://doi.org/10.1016/S1296-2147(01)01221-5","url":null,"abstract":"","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 549-550"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01221-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137290382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental study of coupling Bose–Einstein condensates into weakly non-trapping and trapping states 耦合玻色-爱因斯坦凝聚成弱非俘获态和俘获态的实验研究
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 Epub Date: 2001-06-08 DOI: 10.1016/S1296-2147(01)01191-X
P. Bouyer, S.A. Rangwala, Y. Le Coq, G. Delannoy, F. Gerbier, S. Seidelin, S. Richard, J. Thywissen, A. Aspect
{"title":"Experimental study of coupling Bose–Einstein condensates into weakly non-trapping and trapping states","authors":"P. Bouyer,&nbsp;S.A. Rangwala,&nbsp;Y. Le Coq,&nbsp;G. Delannoy,&nbsp;F. Gerbier,&nbsp;S. Seidelin,&nbsp;S. Richard,&nbsp;J. Thywissen,&nbsp;A. Aspect","doi":"10.1016/S1296-2147(01)01191-X","DOIUrl":"10.1016/S1296-2147(01)01191-X","url":null,"abstract":"<div><p>We study the production of an atom laser from a Bose–Einstein condensate using radio-frequency out-coupling. Single frequency coupling from the Bose–Einstein condensate leads to unstable production of an atom laser due to the extreme sensitivity of this process to magnetic field fluctuations. The extent of this experimental instability is quantified. Stable, repeatable production of an atom laser is achieved by the frequency modulation of the coupling, which forms a frequency comb across the condensate. Different regimes of modulated coupling are discussed. In addition the coupling of atoms into a weakly trapping state is studied. The oscillation frequency of this state in the vertical direction is measured. Preliminary results indicating qualitative difference between condensate and thermal cloud coupling are presented.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 657-662"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01191-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90438074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 Epub Date: 2001-06-08 DOI: 10.1016/S1296-2147(01)01222-7
Alain Aspect (Guest editor), Jean Dalibard (Guest editor)
{"title":"","authors":"Alain Aspect (Guest editor),&nbsp;Jean Dalibard (Guest editor)","doi":"10.1016/S1296-2147(01)01222-7","DOIUrl":"https://doi.org/10.1016/S1296-2147(01)01222-7","url":null,"abstract":"","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 547-548"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01222-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137290383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Coherent transport 连贯的交通
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 Epub Date: 2001-06-08 DOI: 10.1016/S1296-2147(01)01195-7
C. Henkel
{"title":"Coherent transport","authors":"C. Henkel","doi":"10.1016/S1296-2147(01)01195-7","DOIUrl":"10.1016/S1296-2147(01)01195-7","url":null,"abstract":"<div><p>We discuss the transport of matter waves in low-dimensional waveguides. Due to scattering from uncontrollable noise fields, the spatial coherence gets reduced and eventually lost. We develop a description of this decoherence process in terms of transport equations for the atomic Wigner function. We outline its derivation and discuss the special case of white noise where an analytical solution can be found.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 573-580"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01195-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92812123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Determination of Cs–Cs interaction parameters using Feshbach spectroscopy 费什巴赫光谱法测定Cs-Cs相互作用参数
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 Epub Date: 2001-06-08 DOI: 10.1016/S1296-2147(01)01196-9
Andrew J. Kerman , Cheng Chin , Vladan Vuletić , Steven Chu , Paul J. Leo , Carl J. Williams , Paul S. Julienne
{"title":"Determination of Cs–Cs interaction parameters using Feshbach spectroscopy","authors":"Andrew J. Kerman ,&nbsp;Cheng Chin ,&nbsp;Vladan Vuletić ,&nbsp;Steven Chu ,&nbsp;Paul J. Leo ,&nbsp;Carl J. Williams ,&nbsp;Paul S. Julienne","doi":"10.1016/S1296-2147(01)01196-9","DOIUrl":"10.1016/S1296-2147(01)01196-9","url":null,"abstract":"<div><p>We measure high-resolution Feshbach resonance spectra for ultracold cesium atoms colliding in different hyperfine and magnetic sublevels. More than 25 Feshbach resonances are observed for magnetic fields below 230 G in the elastic and inelastic ground state collision cross sections, as well as in the cross section for light-assisted collisions. From these spectra a consistent set of ground state molecular interaction parameters for cesium is extracted, including singlet and triplet scattering lengths of <span><math><mtext>A</mtext><msub><mi></mi><mn><mtext>s</mtext></mn></msub><mtext>=(280±10)a</mtext><msub><mi></mi><mn>0</mn></msub></math></span> and <span><math><mtext>A</mtext><msub><mi></mi><mn><mtext>t</mtext></mn></msub><mtext>=(2400±100)a</mtext><msub><mi></mi><mn>0</mn></msub></math></span>, a van der Waals coefficient <span><math><mtext>C</mtext><msub><mi></mi><mn>6</mn></msub><mtext>=(6890±35)</mtext></math></span> a.u., as well as the strength of the indirect spin–spin coupling. This set of parameters allows for the first time a complete characterization of cesium's ultracold-collision properties.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 633-639"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01196-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78939703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Comptes Rendus 记录
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-04-01 Epub Date: 2001-05-24 DOI: 10.1016/S1296-2147(01)01209-4
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引用次数: 0
Atom interferometry with Bose–Einstein condensed atoms 玻色-爱因斯坦凝聚态原子干涉测量
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-04-01 Epub Date: 2001-05-24 DOI: 10.1016/S1296-2147(01)01181-7
Mark A. Kasevich
{"title":"Atom interferometry with Bose–Einstein condensed atoms","authors":"Mark A. Kasevich","doi":"10.1016/S1296-2147(01)01181-7","DOIUrl":"10.1016/S1296-2147(01)01181-7","url":null,"abstract":"<div><p>We assess the potential impact of Bose–Einstein condensed atomic sources for atom interferometry through experimental investigations of Bose–Einstein condensates confined in optical lattice potentials. We show that this simple experimental system can be used for measurements of acceleration and <span><math><mtext>ℏ/m</mtext></math></span>, and to produce squeezed many-atom quantum states. We discuss possible future applications of this system, which include production of Schrödinger cat states and Heisenberg-limited interferometry. We show how the lattice system may provide a conceptually independent route to many-body degeneracy in bosonic systems as compared with Bose–Einstein condensation.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 3","pages":"Pages 497-507"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01181-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76303603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
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