The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Kimet Jusufi - One of the best experts on this subject based on the ideXlab platform.
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Distinguishing rotating naked singularities from Kerr-like wormholes by their Deflection angles of massive particles
SpringerOpen, 2019Co-Authors: Kimet Jusufi, Ayan Banerjee, Galin Gyulchev, Muhammed AmirAbstract:Abstract We study the gravitational Deflection of relativistic massive particles by Janis–Newman–Winicour (JNW) spacetimes (also known as a rotating source with a surface-like naked singularity), and a rotating Kerr-like wormholes. Based on the recent article (Jusufi in Phys Rev D 98:064017, 2018), we extend some of these results by exploring the effects of naked singularity and Kerr-like objects on the Deflection of particles. We start by introducing coordinate transformation leading to an isotropic line element which gives the refraction inDex of light for the corresponding optical medias. On the other hand, the refraction inDex for massive particles is found by consiDering those particles as a De Broglie Wave packets. To this end, we apply the Gauss–Bonnet theorem to the isotropic optical metrics to find the Deflection angles. Our analysis shows that, in the case of the JNW spacetime the Deflection angle is affected by the parameter $$0
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gravitational Deflection of relativistic massive particles by kerr black holes and teo wormholes viewed as a topological effect
Physical Review D, 2018Co-Authors: Kimet JusufiAbstract:We consiDer the problem of gravitational Deflection of a propagating relativistic massive particles by rotating black holes (Kerr black holes) and rotating wormholes (Teo wormholes) in the weak limit approximation. In particular we have introduced an alternative way to calculate the Deflection angle for massive particles based on the refractive inDex of the optical media and the Gauss-Bonnet theorem applied to the isotropic optical metrics. The refractive inDex governing the propagation of massive particles is calculated by consiDering those particles as a De Broglie Wave packets. Finally applying the Gauss-Bonnet theorem leads to an exact result for the Deflection angle in both geometries. Put in other words, the trajectory of light rays as well as the trajectory of massive particles in a given spacetime background can be viewed as a global spacetime effect, namely as a topological effect.
Yoon-ho Kim - One of the best experts on this subject based on the ideXlab platform.
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Observing photonic De Broglie Waves without the maximally-path-entangled | N , 0 〉 + | 0 , N 〉 state
Physical Review A, 2010Co-Authors: Osung Kwon, Yoon-ho KimAbstract:The photonic De Broglie Wave, in which an ensemble of $N$ iDentical photons with Wavelength $\ensuremath{\lambda}$ reveals $\ensuremath{\lambda}/N$ interference fringes, has been known to be a unique feature exhibited by the photon-number-path\char21{}entangled $|N,0\ensuremath{\rangle}+|0,N\ensuremath{\rangle}$ state or the $N00N$ state. Here, we report the observation of the photonic De Broglie Wave for a pair of photons, generated by spontaneous parametric down-conversion, that are not photon-number-path entangled. We also show that the photonic De Broglie Wave can even be observed for a pair of photons that are completely separable (i.e., no entanglement in all Degrees of freedom) and distinguishable. The experimental and theoretical results suggest that the photonic De Broglie Wave is, in fact, not related to the entanglement of the photons, rather it is related to the indistinguishable pathways established by the measurement scheme. The phase sensitivity surpassing the standard quantum limit, however, is shown to be closely related to the $N00N$ state.
Anton Zeilinger - One of the best experts on this subject based on the ideXlab platform.
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Wave particle duality of c 60 molecules
Nature, 1999Co-Authors: Markus Arndt, Olaf Nairz, Julian Vosandreae, C Keller, Gerbrand Van Der Zouw, Anton ZeilingerAbstract:Quantum superposition lies at the heart of quantum mechanics and gives rise to many of its paradoxes. Superposition of De Broglie matter Waves1 has been observed for massive particles such as electrons2, atoms and dimers3, small van Der Waals clusters4, and neutrons5. But matter Wave interferometry with larger objects has remained experimentally challenging, Despite the Development of powerful atom interferometric techniques for experiments in fundamental quantum mechanics, metrology and lithography6. Here we report the observation of De Broglie Wave interference of C60 molecules by diffraction at a material absorption grating. This molecule is the most massive and complex object in which Wave behaviour has been observed. Of particular interest is the fact that C60 is almost a classical body, because of its many excited internal Degrees of freedom and their possible couplings to the environment. Such couplings are essential for the appearance of Decoherence7,8, suggesting that interference experiments with large molecules should facilitate Detailed studies of this process.
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Atom De Broglie Wave Deflection by a Single Cavity MoDe in the Few-Photon Limit: Quantum Prism.
Physical review letters, 1996Co-Authors: Peter Domokos, Peter Adam, József Janszky, Anton ZeilingerAbstract:It is shown that the Deflection of an atom De Broglie Wave at a nonresonant weak cavity field moDe can yield a pure entangled quantum state in which discernable atomic beams are entangled to photon number states of the field and to internal states of the atom. The proposed experimental scheme is shown to be applicable for quantum nonDemolition measurement of the photon statistics, and for quantum state engineering and reconstruction experiments. {copyright} {ital 1996 The American Physical Society.}
Osung Kwon - One of the best experts on this subject based on the ideXlab platform.
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Observing photonic De Broglie Waves without the maximally-path-entangled | N , 0 〉 + | 0 , N 〉 state
Physical Review A, 2010Co-Authors: Osung Kwon, Yoon-ho KimAbstract:The photonic De Broglie Wave, in which an ensemble of $N$ iDentical photons with Wavelength $\ensuremath{\lambda}$ reveals $\ensuremath{\lambda}/N$ interference fringes, has been known to be a unique feature exhibited by the photon-number-path\char21{}entangled $|N,0\ensuremath{\rangle}+|0,N\ensuremath{\rangle}$ state or the $N00N$ state. Here, we report the observation of the photonic De Broglie Wave for a pair of photons, generated by spontaneous parametric down-conversion, that are not photon-number-path entangled. We also show that the photonic De Broglie Wave can even be observed for a pair of photons that are completely separable (i.e., no entanglement in all Degrees of freedom) and distinguishable. The experimental and theoretical results suggest that the photonic De Broglie Wave is, in fact, not related to the entanglement of the photons, rather it is related to the indistinguishable pathways established by the measurement scheme. The phase sensitivity surpassing the standard quantum limit, however, is shown to be closely related to the $N00N$ state.
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Observing photonic De Broglie Waves without the NOON state
CLEO QELS: 2010 Laser Science to Photonic Applications, 2010Co-Authors: Osung Kwon, Yoon-ho KimyAbstract:We report the observation of the photonic De Broglie Wave for a pair of photons, generated by spontaneous parametric down-conversion, that are not photon number-path entangled. The experimental and theoretical results suggest that the photonic De Broglie Wave is, in fact, not related to the entanglement of the photons, rather it is related to the indistinguishable pathways established by the measurement scheme.
Alexander D. Cronin - One of the best experts on this subject based on the ideXlab platform.
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De Broglie Wave phase shifts induced by surfaces closer than 25 nm
Journal of Physics: Conference Series, 2005Co-Authors: Alexander D. Cronin, John D. PerreaultAbstract:Four atom optics experiments that each serve to measure atom-surface interactions near nanofabricated gratings are presented here. In these experiments atoms in a beam travel within 25 nm of a material grating bar, and the analysis incorporates phase shifts for the atomic De Broglie Waves due to interactions betwen Na atoms and silicon nitriDe surfaces. One atom diffraction experiment Determines the van Der Waals coeficient C3 = 2.7 ± 0.8 meV nm3, and one atom interferometer experiment Determines C3 = 4 ± 1 meV nm3. The results of all four experiments are consistent with the Lifshitz prediction that is explicitly calculated here for Nasilicon nitriDe to be C3 = 3.25 meV nm3. The four atom optics experiments and review of van Der Waals theory are complemented by similar experiments using electron beams and analysis of image-charge effects.
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dispersion compensation for atom interferometry
Physical Review Letters, 2004Co-Authors: Tony D Roberts, Alexander D. Cronin, Martin V Tiberg, David E PritchardAbstract:A new technique for maintaining high contrast in an atom interferometer is used to measure large De Broglie Wave phase shifts. DepenDence of an interaction induced phase on the atoms' velocity is compensated by applying an engineered counterphase. The counterphase is equivalent to a rotation, is precisely Determined by a frequency, and can be used to measure phase shifts due to interactions of unknown strength. Phase shifts of 150 rad (5 times larger than previously possible) have now been measured in an atom beam interferometer, and we suggest that this technique can enable comparisons of atomic polarizability with precision of one part in 10000.