The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
Ole Steuernagel - One of the best experts on this subject based on the ideXlab platform.
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Scheme for fourfold De Broglie wavelength reduction of a multi-photon wavepacket
Journal of Optics B-quantum and Semiclassical Optics, 2002Co-Authors: Ole SteuernagelAbstract:Twofold reduced De Broglie Wavelengths have been observed in two-photon interference experiments. With present technology it should be possible to observe a fourfold reduction when using a four-photon state from spontaneous parametric down-conversion. It is proposed to use a Mach–ZehnDer set-up, which shows boson enhancement at the input beamsplitter and thus allows us to circumvent fourth-orDer non-linearities which would be necessary otherwise. The fourfold Decrease in the observed De Broglie wavelength with perfect visibility is in principle achievable. This constitutes a reduction of the observed De Broglie wavelength below the wavelength of the generating source.
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De Broglie wavelength reduction for a multiphoton wave packet
Physical Review A, 2002Co-Authors: Ole SteuernagelAbstract:An experiment is proposed that permits the observation of the reduced De Broglie Wavelengths of two- and four-photon wave packets using present technology. It is suggested to use a Mach-ZehnDer setup and feed both input ports with light generated by a single nonDegenerate down-conversion source. The strong quantum correlations of the light in conjunction with boson enhancement at the input beam splitter allow us to Detect a two- and fourfold Decrease in the observed De Broglie wavelength with perfect visibility. This allows a reduction of the observed De Broglie wavelength below the wavelength of the source.
Marko Horbatsch - One of the best experts on this subject based on the ideXlab platform.
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A New Atom Trap: The Annular Shell Atom Trap (ASAT)
arXiv: Atomic Physics, 2002Co-Authors: Herschel S. Pilloff, Marko HorbatschAbstract:In the course of exploring some aspects of atom guiding in a hollow, optical fiber, a small negative potential energy well was found just in front of the repulsive or guiding barrier. This results from the optical dipole and the van Der Waals potentials. The ground state for atoms bound in this negative potential well was Determined by numerically solving the Schrodinger eq. and it was found that this negative well could serve as an atom trap. This trap is referred to as the Annular Shell Atom Trap or ASAT because of the geometry of the trapped atoms which are located in the locus of points Defining a very thin annular shell just in front of the guiding barrier. A unique feature of the ASAT is the compression of the atoms from the entire volume to the volume of the annular shell resulting in a very high Density of atoms in this trap. This trap may have applications to very low temperatures using evaporative cooling and possibly the formation of BEC. Finally, a scheme is discussed for taking advantage of the De Broglie wavelength to store atoms in a bottle trap based on the inability of long De Broglie Wavelengths to escape through a selective De Broglie wavelength filter in the atom bottle trap.
Alexander D Cronin - One of the best experts on this subject based on the ideXlab platform.
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measurements of the ground state polarizabilities of cs rb and k using atom interferometry
Physical Review A, 2015Co-Authors: Maxwell D Gregoire, Ivan Hromada, William F Holmgren, Raisa Trubko, Alexander D CroninAbstract:We measured the ground-state static electric-dipole polarizabilities of Cs, Rb, and K atoms using a three-nanograting Mach-ZehnDer atom beam interferometer. Our measurements proviDe benchmark tests for atomic structure calculations and thus test the unDerlying theory used to interpret atomic parity non-conservation experiments. We measured $\alpha_{\mathrm{Cs}} = 4\pi\epsilon_0 \times 59.45(11) \AA^3$, $\alpha_{\mathrm{Rb}} = 4\pi\epsilon_0 \times 47.44(9) \AA^3$, and $\alpha_{\mathrm{K}} = 4\pi\epsilon_0 \times 42.97(8) \AA^3$. In atomic units, these measurements are $\alpha_{\mathrm{Cs}} = 401.2(7)$, $\alpha_{\mathrm{Rb}} = 320.1(6)$, and $\alpha_{\mathrm{K}} = 290.0(5)$. We report ratios of polarizabilities $\alpha_{\mathrm{Cs}}/\alpha_{\mathrm{Rb}} = 1.2532(10)$, $\alpha_{\mathrm{Cs}}/\alpha_{\mathrm{K}} = 1.3835(9)$, and $\alpha_{\mathrm{Rb}}/\alpha_{\mathrm{K}} = 1.1040(9)$ with smaller fractional uncertainty because the systematic errors for individual measurements are largely correlated. Since Cs atom beams have short De Broglie Wavelengths, we Developed measurement methods that do not require resolved atom diffraction. Specifically, we used phase choppers to measure atomic beam velocity distributions, and we used electric field gradients to give the atom interference pattern a phase shift that Depends on atomic polarizability.
Hasmukh K. Tank - One of the best experts on this subject based on the ideXlab platform.
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Will the Quantum Mechanical Waves of Equal De Broglie Wavelength of the Electrons and Protons Interfere in the Double Slit Experiments
viXra, 2014Co-Authors: Hasmukh K. TankAbstract:In a recent paper, titled “Explanation for the observed wave-particle-duality of Light” (Tank, H.K. http://vixra.org/abs/1402.0153, 2014) it was explained that: “Since at very high frequencies, narrowband filtering and generation of purely monochromatic light of one Hertz bandwidth is not yet technically possible, there has been quite a wiDe bandwidth of waves involved, in the double slit experiments and photoelectric experiments performed so far. And since this wiDe ‘band’ of waves coherently add only at discrete points in space and time, we get ‘particles’ at the Detectors.” Now, to further confirm the validity of this explanation, a new kind of experiment is proposed here, in which protons and electrons are accelerated at appropriate velocities vp ve , such that their De Broglie Wavelengths are equal; i.e. ( h / mp vp )= ( h / me ve ) and let them pass through closely spaced slits so that they can interfere with each other. Similarly, in another experiment, their wave-functions: A exp i ( kp X - ωp t ) = A exp i ( ke X - ωe t ) , and let them pass through closely spaced slits, and see how the two matter-waves interfere.
J.b. Kim - One of the best experts on this subject based on the ideXlab platform.
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An atom optics experiment to investigate faster-than-light tunneling
Annalen der Physik, 1998Co-Authors: A.m. Steinberg, H. A. Kim, J Fox, Stefan Myrskog, H S Moon, J.b. KimAbstract:We Describe a series of atom optics experiments unDerway at Toronto for\ninvestigating tunnelling interaction times of various sorts. We begin\nby discussing some outstanding issues and confusions related to the\nquestion of whether or not superluminal tunnelling can be construed as\ntrue faster-than-light ``signal propagation,{''} a question which we\nanswer in the negative. We then argue that atom optics is an arena\niDeally suited for addressing a variety of remaining questions about\nhow, where, and for how long a particle interacts with a tunnel\nbarrier. We present recent results on a modified ``Delta-kick\ncooling{''} scheme which we have used to prepare Rubidium atoms with\none-dimensional De Broglie Wavelengths on the orDer of an optical\nwavelength, along with simulations showing that from these\ntemperatures, we will be able to use acousto-optically modulated\ndipole-force barriers to velocity-select ultracold atom samples iDeal\nfor future tunnelling experiments.