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  • 1
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    Quantum state transfer in optomechanical arrays (2016)
    American Physical Society (APS)
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    Publication Date: 2016-06-29
    Description: Author(s): G. D. de Moraes Neto, F. M. Andrade, V. Montenegro, and S. Bose Quantum state transfer between distant nodes is at the heart of quantum processing and quantum networking. Stimulated by this, we propose a scheme where one can achieve quantum state transfer with a high fidelity between sites in a cavity quantum optomechanical network. In our lattice, each individu… [Phys. Rev. A 93, 062339] Published Mon Jun 27, 2016
    Keywords: Quantum information
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Bell measurements as a witness of a dualism in entanglement (2015)
    American Physical Society (APS)
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    Publication Date: 2015-06-18
    Description: Author(s): E. Moreva, G. Brida, M. Gramegna, S. Bose, D. Home, and M. Genovese We show how the property of dualism, which can exist in the entanglement of identical particles, can be tested in the usual photonic Bell measurement apparatus with minor modifications. Two different sets of coincidence measurements on the same experimental setup consisting of a Hong-Ou-Mandel inter... [Phys. Rev. A 91, 062117] Published Mon Jun 15, 2015
    Keywords: Fundamental concepts
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Tolerance in the Ramsey interference of a trapped nanodiamond (2016)
    American Physical Society (APS)
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    Publication Date: 2016-04-28
    Description: Author(s): C. Wan, M. Scala, S. Bose, A. C. Frangeskou, ATM A. Rahman, G. W. Morley, P. F. Barker, and M. S. Kim In the scheme recently proposed by M. Scala et al. [ Phys. Rev. Lett. 111 , 180403 (2013) ], a gravity-dependent phase shift is induced on the spin of a nitrogen-vacancy (NV) center in a trapped nanodiamond by the interaction between its magnetic moment and the quantized motion of the particle. This pr… [Phys. Rev. A 93, 043852] Published Wed Apr 27, 2016
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Free Nano-Object Ramsey Interferometry for Large Quantum Superpositions (2016)
    American Physical Society (APS)
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    Publication Date: 2016-09-29
    Description: Author(s): C. Wan, M. Scala, G. W. Morley, ATM. A. Rahman, H. Ulbricht, J. Bateman, P. F. Barker, S. Bose, and M. S. Kim We propose an interferometric scheme based on an untrapped nano-object subjected to gravity. The motion of the center of mass (c.m.) of the free object is coupled to its internal spin system magnetically, and a free flight scheme is developed based on coherent spin control. The wave packet of the te… [Phys. Rev. Lett. 117, 143003] Published Wed Sep 28, 2016
    Keywords: Atomic, Molecular, and Optical Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Nonclassicality of the Harmonic-Oscillator Coherent State Persisting up to the Macroscopic Domain (2018)
    American Physical Society (APS)
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    Publication Date: 2018-05-26
    Description: Author(s): S. Bose, D. Home, and S. Mal Can the most “classical-like” of all quantum states, namely the Schrödinger coherent state of a harmonic oscillator, exhibit nonclassical behavior? We find that for an oscillating object initially in a coherent state, merely by observing at various instants which spatial region the object is in, the... [Phys. Rev. Lett. 120, 210402] Published Fri May 25, 2018
    Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 6
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    Bose et al. Reply: (2017)
    American Physical Society (APS)
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    Publication Date: 2017-03-14
    Description: Author(s): S. Bose, C. Wan, M. Scala, G. W. Morley, P. F. Barker, and M. S. Kim [Phys. Rev. Lett. 118, 108902] Published Fri Mar 10, 2017
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 7
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    Planes of satellite galaxies: when exceptions are the rule (2015)
    Oxford University Press
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    Publication Date: 2015-08-08
    Description: The detection of planar structures within the satellite systems of both the Milky Way (MW) and Andromeda (M31) has been reported as being in stark contradiction to the predictions of the standard cosmological model ( cold dark matter – CDM). Given the ambiguity in defining a planar configuration, it is unclear how to interpret the low incidence of the MW and M31 planes in CDM. We investigate the prevalence of satellite planes around galactic mass haloes identified in high-resolution cosmological simulations. We find that planar structures are very common, and that ~10 per cent of CDM haloes have even more prominent planes than those present in the Local Group. While ubiquitous, the planes of satellite galaxies show a large diversity in their properties. This precludes using one or two systems as small-scale probes of cosmology, since a large sample of satellite systems is needed to obtain a good measure of the object-to-object variation. This very diversity has been misinterpreted as a discrepancy between the satellite planes observed in the Local Group and CDM predictions. In fact, ~10 per cent of CDM galactic haloes have planes of satellites that are as infrequent as the MW and M31 planes. The look-elsewhere effect plays an important role in assessing the detection significance of satellite planes and accounting for it leads to overestimating the significance level by a factor of 30 and 100 for the MW and M31 systems, respectively.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 8
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    SN 2013ab: a normal Type IIP supernova in NGC 5669 (2015)
    Oxford University Press
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    Publication Date: 2015-05-08
    Description: We present densely sampled ultraviolet/optical photometric and low-resolution optical spectroscopic observations of the Type IIP supernova 2013ab in the nearby (~24 Mpc) galaxy NGC 5669, from 2 to 190 d after explosion. Continuous photometric observations, with the cadence of typically a day to one week, were acquired with the 1–2 m class telescopes in the Las Cumbres Observatory Global Telescope network, ARIES telescopes in India and various other telescopes around the globe. The light curve and spectra suggest that the supernova (SN) is a normal Type IIP event with a plateau duration of ~80 d with mid-plateau absolute visual magnitude of –16.7, although with a steeper decline during the plateau (0.92 mag 100 d –1 in V band) relative to other archetypal SNe of similar brightness. The velocity profile of SN 2013ab shows striking resemblance with those of SNe 1999em and 2012aw. Following the Rabinak & Waxman prescription, the initial temperature evolution of the SN emission allows us to estimate the progenitor radius to be ~800 R , indicating that the SN originated from a red supergiant star. The distance to the SN host galaxy is estimated to be 24.3 Mpc from expanding photosphere method. From our observations, we estimate that 0.064 M of 56 Ni was synthesized in the explosion. General relativistic, radiation hydrodynamical modelling of the SN infers an explosion energy of 0.35  x 10 51  erg, a progenitor mass (at the time of explosion) of ~9 M and an initial radius of ~600 R .
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Satellite galaxies in semi-analytic models of galaxy formation with sterile neutrino dark matter (2016)
    Oxford University Press
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    Publication Date: 2016-06-30
    Description: The sterile neutrino is a viable dark matter candidate that can be produced in the early Universe via non-equilibrium processes, and would therefore possess a highly non-thermal spectrum of primordial velocities. In this paper we analyse the process of structure formation with this class of dark matter particles. To this end we construct primordial dark matter power spectra as a function of the lepton asymmetry, L 6 , that is present in the primordial plasma and leads to resonant sterile neutrino production. We compare these power spectra with those of thermally produced dark matter particles and show that resonantly produced sterile neutrinos are much colder than their thermal relic counterparts. We also demonstrate that the shape of these power spectra is not determined by the free-streaming scale alone. We then use the power spectra as an input for semi-analytic models of galaxy formation in order to predict the number of luminous satellite galaxies in a Milky Way-like halo. By assuming that the mass of the Milky Way halo must be no more than 2 x 10 12 M (the adopted upper bound based on current astronomical observations) we are able to constrain the value of L 6 for M s ≤ 8 keV. We also show that the range of L 6 that is in best agreement with the 3.5 keV line (if produced by decays of 7 keV sterile neutrino) requires that the Milky Way halo has a mass no smaller than 1.5 x 10 12 M . Finally, we compare the power spectra obtained by direct integration of the Boltzmann equations for a non-resonantly produced sterile neutrino with the fitting formula of Viel et al. and find that the latter significantly underestimates the power amplitude on scales relevant to satellite galaxies.
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    Electronic ISSN: 1365-2966
    Topics: Physics
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  • 10
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    The mass-concentration-redshift relation of cold and warm dark matter haloes (2016)
    Oxford University Press
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    Publication Date: 2016-06-01
    Description: We use a suite of cosmological simulations to study the mass–concentration–redshift relation, c ( M, z ), of dark matter haloes. Our simulations include standard -cold dark matter (CDM) models, and additional runs with truncated power spectra, consistent with a thermal warm dark matter (WDM) scenario. We find that the mass profiles of CDM and WDM haloes are self-similar and well approximated by the Einasto profile. The c ( M, z ) relation of CDM haloes is monotonic: concentrations decrease with increasing virial mass at fixed redshift, and decrease with increasing redshift at fixed mass. The mass accretion histories (MAHs) of CDM haloes are also scale-free, and can be used to infer concentrations directly. These results do not apply to WDM haloes: their MAHs are not scale-free because of the characteristic scale imposed by the power spectrum suppression. Further, the WDM c ( M, z ) relation is non-monotonic: concentrations peak at a mass scale dictated by the truncation scale, and decrease at higher and lower masses. We show that the assembly history of a halo can still be used to infer its concentration, provided that the total mass of its progenitors is considered (the ‘collapsed mass history’; CMH), rather than just that of its main ancestor. This exploits the scale-free nature of CMHs to derive a simple scaling that reproduces the mass–concentration–redshift relation of both CDM and WDM haloes over a vast range of halo masses and redshifts. Our model therefore provides a robust account of the mass, redshift, cosmology and power spectrum dependence of dark matter halo concentrations.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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