Now showing items 1-19 of 19

    • Bounding the Set of Finite Dimensional Quantum Correlations 

      Navascués, M.; Vértesi, T. (American Physical Society, 2015)
      We describe a simple method to derive high performance semidefinite programing relaxations for optimizations over complex and real operator algebras in finite dimensional Hilbert spaces. The method is very flexible, easy ...
    • Canonical-covariant Wigner function in polar form 

      Hakioǧlu, T. (OSA - The Optical Society, 2000)
      The two-dimensional Wigner function was investigated in polar canonical coordinates. The covariance properties under the action of affine canonical transformations were derived. The polar canonical phase-space representations ...
    • Characterizing finite-dimensional quantum behavior 

      Navascués, M.; Feix, A.; Araújo, M.; Vértesi, T. (American Physical Society, 2015)
      We study and extend the semidefinite programming (SDP) hierarchies introduced in Navascués and Vértesi [Phys. Rev. Lett. 115, 020501 (2015)PRLTAO0031-900710.1103/PhysRevLett.115.020501] for the characterization of the ...
    • High-efficiency and low-loss gallium nitride dielectric metasurfaces for nanophotonics at visible wavelengths 

      Emani, N. K.; Khaidarov, E.; Paniagua-Domínguez, R.; Fu, Y. H.; Valuckas, V.; Lu S.; Zhang X.; Tan S.T.; Demir, H. V.; Kuznetsov, A. I. (American Institute of Physics Inc., 2017)
      The dielectric nanophotonics research community is currently exploring transparent material platforms (e.g., TiO2, Si3N4, and GaP) to realize compact high efficiency optical devices at visible wavelengths. Efficient ...
    • Non-Markovian dynamics in ultracold Rydberg aggregates 

      Genkin, M.; Schönleber, D. W.; Wüster, S.; Eisfeld, A. (Institute of Physics Publishing Ltd., 2016)
      We propose a setup of an open quantum system in which the environment can be tuned such that either Markovian or non-Markovian system dynamics can be achieved. The implementation uses ultracold Rydberg atoms, relying on ...
    • Non-orthogonal domains in phase space of quantum optics and their relation to fractional Fourier transforms 

      Aytür, O.; Ozaktas, H. M. (Elsevier BV * North-Holland, 1995-10-15)
      It is customary to define a phase space such that position and momentum are mutually orthogonal coordinates. Associated with these coordinates, or domains, are the position and momentum operators. Representations of the ...
    • Operational approach in the weak-field measurement of polarization fluctuations 

      Hakioǧlu T. (American Physical Society, 1999)
      The operational approach to the measurement of phase studied by Noh, Fougerès, and Mandel [Phys. Rev. A 45, 424 (1992); 46, 2840 (1992); Phys. Rev. Lett. 71, 2579 (1993); Phys. Rev. A 47, 4535 (1993)] is applied to the ...
    • Polarization of radiation in multipole Jaynes-Cummings model 

      Can, M.A.; Shumovsky, A.S. (Taylor & Francis Ltd, 2002)
      We discuss the spatial properties of quantum radiation emitted by a multipole transition in a single atom. It is shown that the polarization of multipole radiation and quantum fluctuations of polarization change with ...
    • Quantifying quantum information via uncertainties 

      Öztop, B.; Klyachko, A. A.; Shumovsky, A. S. (Optical Society of America, 2007)
      We show, for a state ψ of a quantum system with the dynamic symmetry given by the Lie group G, total amount of quantum information and entanglement is provided by summarized uncertainty of basic observables. © 2007 Optical ...
    • Quantum bistability, structural transformation, and spontaneous persistent currents in mesoscopic aharonov-bohm loops 

      Kulik, I. O. (World Scientific Publishing Co., 2005)
      Fixed-number-of-electron mesoscopic or macromolecular conducting ring is shown to support persistent currents due to Aharonov-Bohm flux, and the "spontaneous" persistent currents without the flux when structural transformation ...
    • Quantum Dynamics of Long-Range Interacting Systems Using the Positive-P and Gauge-P Representations 

      Wüster, S.; Corney, J. F.; Rost, J. M.; Deuar, P. (American Physical Society, 2017)
      We provide the necessary framework for carrying out stochastic positive-P and gauge-P simulations of bosonic systems with long-range interactions. In these approaches, the quantum evolution is sampled by trajectories in ...
    • Quantum information processing in solid states: A critique of two-level approximation 

      Savran K.; Hakioğlu T. (World Scientific Publishing Co., 2005)
      We examine the effect of multilevels on decoherence and dephasing properties of a quantum system consisting of a non-ideal two level subspace, identified as the qubit and a finite set of higher energy levels above this ...
    • Quantum statistics of light interacting with matter 

      Müstecaplıoğlu, ÖE (Bilkent University, 1999)
      Studies on some systems in which light interacts with matter are performed from quantum statistical point of view. As a result of these studies a novel effect which can be utilized for detecting squeezed phonons is ...
    • Raman enhancement on a broadband meta-surface 

      Ayas S.; Güner, H.; Türker, B.; Ekiz, O. O.; Dirisaglik, F.; Okyay, A., K.; Dâna, A. (American Chemical Society, 2012-07-30)
      Plasmonic metamaterials allow confinement of light to deep subwavelength dimensions, while allowing for the tailoring of dispersion and electromagnetic mode density to enhance specific photonic properties. Optical resonances ...
    • Simple test for hidden variables in spin-1 systems 

      Klyachko, A. A.; Can, M. A.; Binicioǧlu, S.; Shumovsky, A. S. (2008)
      We resolve an old problem about the existence of hidden parameters in a three-dimensional quantum system by constructing an appropriate Bell's type inequality. This reveals the nonclassical nature of most spin-1 states. ...
    • Single qutrit entanglement 

      Binicioglu, S.; Klyachko, A. A.; Shumovsky, A. S. (Optical Society of America, 2007)
      We discussed a recent approach to quantum entanglement. The approach is based on presetting of basic observables of quantum system. Entangled states are interpreted as states with maximal amount of uncertainty of all basic ...
    • Spatial properties of quantum multipole radiation 

      Can, Muhammet Ali (Bilkent University, 2000)
      Complete quantum mechanical treatment of multipole radiation is constructed. Vacuum noise of polarization for transversally and longitudirudly polcirized fields is discussed for different total angular momentum values ...
    • Study of junction and bias parameters in readout of phase qubits 

      Zandi H.; Safaei, S.; Khorasani, S.; Fardmanesh, M. (2012)
      The exact numerical solution of the nonlinear Ginzburg-Landau equation for Josephson junctions is obtained, from which the precise nontrivial current density and effective potential of the Josephson junctions are found. ...
    • Wafer-scale arrays of high-Q silica optical microcavities 

      Ozgur E.; Huseyinoglu E.; Dana, A. (OSA - The Optical Society, 2017)
      On-chip high-Q microcavities possess significant potential in terms of integration of optical microresonators into functional optoelectronic devices that could be used in various applications, including biosensors, ...