Browsing by Keyword "quantum physics"
Now showing items 1-20 of 60
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Absence of Quantum Oscillations and Dependence on Site Energies in Electronic Excitation Transfer in the Fenna–Matthews–Olson Trimer
(American Chemical Society, 2011)Energy transfer in the photosynthetic Fenna–Matthews–Olson (FMO) complex of green sulfur bacteria is studied numerically taking all three subunits (monomers) of the FMO trimer and the recently found eighth bacteriochlorophyll ... -
Adiabatic Preparation of Many-Body States in Optical Lattices
(American Physical Society, 2010)We analyze a technique for the preparation of low-entropy many-body states of atoms in optical lattices based on adiabatic passage. In particular, we show that this method allows preparation of strongly correlated states ... -
Anyonic Interferometry and Protected Memories in Atomic Spin Lattices
(Nature Publishing Group, 2008)Strongly correlated quantum systems can exhibit exotic behavior called topological order which is characterized by non-local correlations that depend on the system topology. Such systems can exhibit remarkable phenomena ... -
Atomistic Study of the Long-Lived Quantum Coherences in the Fenna-Matthews-Olson Complex
(Biophysical Society, 2011)A remarkable amount of theoretical research has been carried out to elucidate the physical origins of the recently observed long-lived quantum coherence in the electronic energy transfer process in biological photosynthetic ... -
Characterization of Topological States on a Lattice with Chern Number
(Institute of Physics, 2008)We study Chern numbers to characterize the ground state of strongly interacting systems on a lattice. This method allows us to perform a numerical characterization of bosonic fractional quantum Hall (FQH) states on a lattice ... -
Coherent Quantum Optical Control with Subwavelength Resolution
(American Physical Society, 2008)We suggest a new method for quantum optical control with nanoscale resolution. Our method allows for coherent far-field manipulation of individual quantum systems with spatial selectivity that is not limited by the wavelength ... -
D-brane Construction of the 5D NHEK Dual
(Springer-Verlag, 2012)Extremal but non-supersymmetric charged black holes with \(SU(2)_L\) spin in IIB string theory compactified to five dimensions on \(K^3 \times S^1\) are considered. These have a near-horizon or NHEK region with an enhanced ... -
Demon-like Algorithmic Quantum Cooling and Its Realization with Quantum Optics
(Nature Publishing Group, 2014)Simulation of the low-temperature properties of many-body systems remains one of the major challenges in theoretical and experimental quantum information science. We present, and demonstrate experimentally, a universal ... -
Designing and Probing Open Quantum Systems: Quantum Annealing, Excitonic Energy Transfer, and Nonlinear Fluorescence Spectroscopy
(2012-07-27)The 20th century saw the first revolution of quantum mechanics, setting the rules for our understanding of light, matter, and their interaction. The 21st century is focused on using these quantum mechanical laws to develop ... -
Deterministic Coupling of a Single Nitrogen Vacancy Center to a Photonic Crystal Cavity
(American Chemical Society, 2010)We describe and experimentally demonstrate a technique for deterministic, large coupling between a photonic crystal (PC) nanocavity and single photon emitters. The technique is based on in situ scanning of a PC cavity over ... -
Enhanced Single-Photon Emission from a Diamond-Silver Aperture
(Nature Publishing Group, 2011)Solid-state quantum emitters, such as the nitrogen-vacancy centre in diamond, are robust systems for practical realizations of various quantum information processing protocols and nanoscale magnetometry schemes at room ... -
Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
(American Physical Society, 2010)In many realizations of electron spin qubits the dominant source of decoherence is the fluctuating nuclear spin bath of the host material. The slowness of this bath lends itself to a promising mitigation strategy where the ... -
Entanglement Entropy in the O(N) Model
(American Physical Society, 2009)It is generally believed that in spatial dimension \(d\) > 1 the leading contribution to the entanglement entropy \(S = - tr\rho_A log \rho_A\) scales as the area of the boundary of subsystem \(A\). The coefficient of this ... -
Exploiting Locality in Quantum Computation for Quantum Chemistry
(American Chemical Society (ACS), 2014)Accurate prediction of chemical and material properties from first principles quantum chemistry is a challenging task on traditional computers. Recent developments in quantum computation offer a route towards highly accurate ... -
Fermion- and Spin-Counting in Strongly Correlated Systems
(American Physical Society, 2008)We apply the atom counting theory to strongly correlated Fermi systems and spin models, which can be realized with ultracold atoms. The counting distributions are typically sub-Poissonian and remain smooth at quantum phase ... -
Finding Low-Energy Conformations of Lattice Protein Models by Quantum Annealing
(Nature Publishing Group, 2012)Lattice protein folding models are a cornerstone of computational biophysics. Although these models are a coarse grained representation, they provide useful insight into the energy landscape of natural proteins. Finding ... -
From Navier-Stokes to Einstein
(Springer-Verlag, 2012)We show by explicit construction that for every solution of the incompressible Navier-Stokes equation in \(p + 1\) dimensions, there is a uniquely associated “dual” solution of the vacuum Einstein equations in \(p + 2\) ... -
Future Boundary Conditions in de Sitter Space
(Springer-Verlag, 2012)We consider asymptotically future de Sitter spacetimes endowed with an eternal observatory. In the conventional descriptions, the conformal metric at the future boundary \(I^+\) is deformed by the flux of gravitational ... -
General Bound on the Rate of Decoherence
(2011)We establish the necessary and sufficient conditions for a quantum system to be stable under any general system-environment interaction. Quantum systems are stable when the time-derivative of their purity is zero. This ... -
Inducing Vortices in a Bose-Einstein Condensate Using Holographically Produced Light Beams
(Optical Society of America, 2011)In this paper we demonstrate a technique that can create non-equilibrium vortex configurations with almost arbitrary charge and geometry in a Bose-Einstein condensate. We coherently transfer orbital angular momentum from ...