Acrobat PDF (68 KB) * * Note that full-text PDFs from conferences typically contain 1-3 pages of ... more Acrobat PDF (68 KB) * * Note that full-text PDFs from conferences typically contain 1-3 pages of content, some or all of which might be an abstract, summary, or miscellaneous items. ... Please enable Javascript in your browser to view the abstract as intended. ... We propose strategy for generating arbitrary and coherent superpositions of counter-rotating phase structures in BEC, as possible candidates for qubits. We devise methods to generate and detect them through orbital angular momentum beams of light. ... References are not available for this paper.
We propose a bootstrapping approach to generation of maximally path-entangled states of photons, ... more We propose a bootstrapping approach to generation of maximally path-entangled states of photons, so called "NOON states". Strong atom-light interaction of cavity QED can be employed to generate NOON states with about 100 photons; which can then be used to boost the existing experimental Kerr nonlinearities based on quantum coherence effects to facilitate NOON generation with arbitrarily large number of photons all within the current experimental state of the art technology. We also offer an alternative scheme that uses an atom-cavity dispersive interaction to obtain sufficiently high Kerr-nonlinearity necessary for arbitrary NOON generation.
Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing, 2008
Acrobat PDF (96 KB) * * Note that full-text PDFs from conferences typically contain 1-3 pages of ... more Acrobat PDF (96 KB) * * Note that full-text PDFs from conferences typically contain 1-3 pages of content, some or all of which might be an abstract, summary, or miscellaneous items. ... Please enable Javascript in your browser to view the abstract as intended. ... We present an overview of theoretical work on atomic vortices created using OAM states. Gyroscopes are an important application of atomic vortex superposition. We use non-destructive detection schemes to compare with sensitivity of current gyroscopes. ... References are not available for this paper.
Kishore T. Kapale Jet Propulsion Laboratory, California Institute of Technnology, 4800 Oak Grove ... more Kishore T. Kapale Jet Propulsion Laboratory, California Institute of Technnology, 4800 Oak Grove Drive, Pasadena, CA 91101 Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana, 70803-4001 [email protected] ... Jonathan P. Dowling Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana, 70803-4001 [email protected] ... Abstract: Creating vortex state superposition in Bose-Einstein Condensates (BEC) has been studied by coupling BEC with ...
We show deterministic generation of Werner states as a steady state of the collective decay dynam... more We show deterministic generation of Werner states as a steady state of the collective decay dynamics of a pair of neutral atoms coupled to a leaky cavity and strong coherent drive. We also show how the scheme can be extended to generate a 2N-particle analogue of the bipartite Werner states.
Journal of Physics B: Atomic, Molecular and Optical Physics, 2006
We present an atom localization scheme based on coherent population trapping. We consider atomic ... more We present an atom localization scheme based on coherent population trapping. We consider atomic transitions in a Lambda configuration where the control field is a standing-wave field. The probe field and the control field produce coherence between the two ground states and prepare the atom in a pure state. We show that the population in one of the ground states has the same fringe pattern as produced by a Fabry-Perot interferometer and thus measurement of this population would localize the atom. Interestingly enough the role of the cavity finesse is played by the ratio of the intensities of the pump and probe. This is in fact the reason for obtaining extreme subwavelength localization.
Bulletin of the American Physical Society, May 20, 2009
It has long been known that matter-wave gyroscopes are orders of magnitude more sensitive that op... more It has long been known that matter-wave gyroscopes are orders of magnitude more sensitive that optical gyroscopes. The creation of matter-wave currents that can achieve such sensitivity is a continuing challenge. We propose the use of Optical Angular Momentum (OAM) induced vortices in Bose-Einstein Condensates (BECs) as an ideal candidate for quantum gyroscopy. Coherent superpositions of left and right rotating quantum states of a trapped condensate lead to an interference pattern that rotates when the trap rotates---in accordance with the ...
We propose a scheme for generation of arbitrary coherent superposition of vortex states in Bose-E... more We propose a scheme for generation of arbitrary coherent superposition of vortex states in Bose-Einstein condensates (BEC) using the orbital angular momentum (OAM) states of light. We devise a scheme to generate coherent superpositions of two counter-rotating OAM states of light using known experimental techniques. We show that a specially designed Raman scheme allows transfer of the optical vortex superposition state onto an initially non-rotating BEC. This creates an arbitrary and coherent superposition of a vortex and anti-vortex pair in the BEC. The ideas presented here could be extended to generate entangled vortex states, design memories for the OAM states of light, and perform other quantum information tasks. Applications to inertial sensing are also discussed.
Quantum entanglement has the potential to revolutionize the entire field of interferometric sensi... more Quantum entanglement has the potential to revolutionize the entire field of interferometric sensing by providing many orders of magnitude improvement in interferometer sensitivity. The quantum-entangled particle interferometer approach is very general and applies to many types of interferometers. In particular, without nonlocal entanglement, a generic classical interferometer has a statistical-sampling shot-noise limited sensitivity that scales like 1/ √ N , where N is the number of particles passing through the interferometer per unit time. However, if carefully prepared quantum correlations are engineered between the particles, then the interferometer sensitivity improves by a factor of √ N to scale like 1/N , which is the limit imposed by the Heisenberg Uncertainty Principle. For optical interferometers operating at milliwatts of optical power, this quantum sensitivity boost corresponds to an eight-order-of-magnitude improvement of signal to noise. This effect can translate into a tremendous science pay-off for space missions. For example, one application of this new effect is to fiber optical gyroscopes for deep-space inertial guidance and tests of General Relativity (Gravity Probe B). Another application is to ground and orbiting optical interferometers for gravity wave detection, Laser Interferometer Gravity Observatory (LIGO) and the European Laser Interferometer Space Antenna (LISA), respectively. Other applications are to Satellite-to-Satellite laser Interferometry (SSI) proposed for the next generation Gravity Recovery And Climate Experiment (GRACE II).
We present a coherent population trapping based scheme to attain sub-nanoscale resolution for mic... more We present a coherent population trapping based scheme to attain sub-nanoscale resolution for microscopy. We use three-level atoms coupled to amplitude modulated probe field and spatially dependent (standing-wave or Laguerre-Gaussian) coupling field. The probe field modulation allows us to tap into the steep dispersion normally associated with electromagnetically induced transparency and offers sub-nanometer resolution using optical fields.
Part I: The problem of Bose-Einstein condensation of an ideal gas is dealt with to determine the ... more Part I: The problem of Bose-Einstein condensation of an ideal gas is dealt with to determine the condensate statistics. A brief description of the inter-relations between various ensembles of statistical mechanics is given. Thereafter, various canonical ensemble methods applied to the trapped ideal Bose gas are discussed in great detail. Further, strategies to convert the canonical ensemble results into the microcanonical ensemble description are also discussed. Part II: Various topics bound by a common theme based on the principle of atomic coherence are studied in the second part. First a scheme exploiting interference of incoherent pump processes to achieve strong control over the total spontaneous emission from a three-level atom is discussed. Thereafter various schemes to achieve radiative cooling without the presence of spontaneous emission on the cooling transition are considered. This allows cooling to an internal absolute zero of temperature in an atomic system in very smal...
Acrobat PDF (68 KB) * * Note that full-text PDFs from conferences typically contain 1-3 pages of ... more Acrobat PDF (68 KB) * * Note that full-text PDFs from conferences typically contain 1-3 pages of content, some or all of which might be an abstract, summary, or miscellaneous items. ... Please enable Javascript in your browser to view the abstract as intended. ... We propose strategy for generating arbitrary and coherent superpositions of counter-rotating phase structures in BEC, as possible candidates for qubits. We devise methods to generate and detect them through orbital angular momentum beams of light. ... References are not available for this paper.
We propose a bootstrapping approach to generation of maximally path-entangled states of photons, ... more We propose a bootstrapping approach to generation of maximally path-entangled states of photons, so called "NOON states". Strong atom-light interaction of cavity QED can be employed to generate NOON states with about 100 photons; which can then be used to boost the existing experimental Kerr nonlinearities based on quantum coherence effects to facilitate NOON generation with arbitrarily large number of photons all within the current experimental state of the art technology. We also offer an alternative scheme that uses an atom-cavity dispersive interaction to obtain sufficiently high Kerr-nonlinearity necessary for arbitrary NOON generation.
Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing, 2008
Acrobat PDF (96 KB) * * Note that full-text PDFs from conferences typically contain 1-3 pages of ... more Acrobat PDF (96 KB) * * Note that full-text PDFs from conferences typically contain 1-3 pages of content, some or all of which might be an abstract, summary, or miscellaneous items. ... Please enable Javascript in your browser to view the abstract as intended. ... We present an overview of theoretical work on atomic vortices created using OAM states. Gyroscopes are an important application of atomic vortex superposition. We use non-destructive detection schemes to compare with sensitivity of current gyroscopes. ... References are not available for this paper.
Kishore T. Kapale Jet Propulsion Laboratory, California Institute of Technnology, 4800 Oak Grove ... more Kishore T. Kapale Jet Propulsion Laboratory, California Institute of Technnology, 4800 Oak Grove Drive, Pasadena, CA 91101 Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana, 70803-4001 [email protected] ... Jonathan P. Dowling Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana, 70803-4001 [email protected] ... Abstract: Creating vortex state superposition in Bose-Einstein Condensates (BEC) has been studied by coupling BEC with ...
We show deterministic generation of Werner states as a steady state of the collective decay dynam... more We show deterministic generation of Werner states as a steady state of the collective decay dynamics of a pair of neutral atoms coupled to a leaky cavity and strong coherent drive. We also show how the scheme can be extended to generate a 2N-particle analogue of the bipartite Werner states.
Journal of Physics B: Atomic, Molecular and Optical Physics, 2006
We present an atom localization scheme based on coherent population trapping. We consider atomic ... more We present an atom localization scheme based on coherent population trapping. We consider atomic transitions in a Lambda configuration where the control field is a standing-wave field. The probe field and the control field produce coherence between the two ground states and prepare the atom in a pure state. We show that the population in one of the ground states has the same fringe pattern as produced by a Fabry-Perot interferometer and thus measurement of this population would localize the atom. Interestingly enough the role of the cavity finesse is played by the ratio of the intensities of the pump and probe. This is in fact the reason for obtaining extreme subwavelength localization.
Bulletin of the American Physical Society, May 20, 2009
It has long been known that matter-wave gyroscopes are orders of magnitude more sensitive that op... more It has long been known that matter-wave gyroscopes are orders of magnitude more sensitive that optical gyroscopes. The creation of matter-wave currents that can achieve such sensitivity is a continuing challenge. We propose the use of Optical Angular Momentum (OAM) induced vortices in Bose-Einstein Condensates (BECs) as an ideal candidate for quantum gyroscopy. Coherent superpositions of left and right rotating quantum states of a trapped condensate lead to an interference pattern that rotates when the trap rotates---in accordance with the ...
We propose a scheme for generation of arbitrary coherent superposition of vortex states in Bose-E... more We propose a scheme for generation of arbitrary coherent superposition of vortex states in Bose-Einstein condensates (BEC) using the orbital angular momentum (OAM) states of light. We devise a scheme to generate coherent superpositions of two counter-rotating OAM states of light using known experimental techniques. We show that a specially designed Raman scheme allows transfer of the optical vortex superposition state onto an initially non-rotating BEC. This creates an arbitrary and coherent superposition of a vortex and anti-vortex pair in the BEC. The ideas presented here could be extended to generate entangled vortex states, design memories for the OAM states of light, and perform other quantum information tasks. Applications to inertial sensing are also discussed.
Quantum entanglement has the potential to revolutionize the entire field of interferometric sensi... more Quantum entanglement has the potential to revolutionize the entire field of interferometric sensing by providing many orders of magnitude improvement in interferometer sensitivity. The quantum-entangled particle interferometer approach is very general and applies to many types of interferometers. In particular, without nonlocal entanglement, a generic classical interferometer has a statistical-sampling shot-noise limited sensitivity that scales like 1/ √ N , where N is the number of particles passing through the interferometer per unit time. However, if carefully prepared quantum correlations are engineered between the particles, then the interferometer sensitivity improves by a factor of √ N to scale like 1/N , which is the limit imposed by the Heisenberg Uncertainty Principle. For optical interferometers operating at milliwatts of optical power, this quantum sensitivity boost corresponds to an eight-order-of-magnitude improvement of signal to noise. This effect can translate into a tremendous science pay-off for space missions. For example, one application of this new effect is to fiber optical gyroscopes for deep-space inertial guidance and tests of General Relativity (Gravity Probe B). Another application is to ground and orbiting optical interferometers for gravity wave detection, Laser Interferometer Gravity Observatory (LIGO) and the European Laser Interferometer Space Antenna (LISA), respectively. Other applications are to Satellite-to-Satellite laser Interferometry (SSI) proposed for the next generation Gravity Recovery And Climate Experiment (GRACE II).
We present a coherent population trapping based scheme to attain sub-nanoscale resolution for mic... more We present a coherent population trapping based scheme to attain sub-nanoscale resolution for microscopy. We use three-level atoms coupled to amplitude modulated probe field and spatially dependent (standing-wave or Laguerre-Gaussian) coupling field. The probe field modulation allows us to tap into the steep dispersion normally associated with electromagnetically induced transparency and offers sub-nanometer resolution using optical fields.
Part I: The problem of Bose-Einstein condensation of an ideal gas is dealt with to determine the ... more Part I: The problem of Bose-Einstein condensation of an ideal gas is dealt with to determine the condensate statistics. A brief description of the inter-relations between various ensembles of statistical mechanics is given. Thereafter, various canonical ensemble methods applied to the trapped ideal Bose gas are discussed in great detail. Further, strategies to convert the canonical ensemble results into the microcanonical ensemble description are also discussed. Part II: Various topics bound by a common theme based on the principle of atomic coherence are studied in the second part. First a scheme exploiting interference of incoherent pump processes to achieve strong control over the total spontaneous emission from a three-level atom is discussed. Thereafter various schemes to achieve radiative cooling without the presence of spontaneous emission on the cooling transition are considered. This allows cooling to an internal absolute zero of temperature in an atomic system in very smal...
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