1,129 research outputs found
Measurement of an integral of a classical field with a single quantum particle
A method for measuring an integral of a classical field via local interaction
of a single quantum particle in a superposition of 2^N states is presented. The
method is as efficient as a quantum method with N qubits passing through the
field one at a time and it is exponentially better than any known classical
method that uses N bits passing through the field one at a time. A related
method for searching a string with a quantum particle is proposed.Comment: 3 page
Dendroecology of Gymnanthes klotzschiana Müll. Arg. trees, naturally growing in Northern Uruguay.
Ameridendro
Estrutura etária em uma população de Araucaria angustifolia (Araucariaceae) no Parque Nacional do Iguaçu-PR.
Entanglement measure for general pure multipartite quantum states
We propose an explicit formula for an entanglement measure of pure
multipartite quantum states, then study a general pure tripartite state in
detail, and at end we give some simple but illustrative examples on four-qubits
and m-qubits states.Comment: 5 page
Entanglement and the nonlinear elastic behavior of forests of coiled carbon nanotubes
Helical or coiled nanostructures have been object of intense experimental and
theoretical studies due to their special electronic and mechanical properties.
Recently, it was experimentally reported that the dynamical response of
foamlike forest of coiled carbon nanotubes under mechanical impact exhibits a
nonlinear, non-Hertzian behavior, with no trace of plastic deformation. The
physical origin of this unusual behavior is not yet fully understood. In this
work, based on analytical models, we show that the entanglement among
neighboring coils in the superior part of the forest surface must be taken into
account for a full description of the strongly nonlinear behavior of the impact
response of a drop-ball onto a forest of coiled carbon nanotubes.Comment: 4 pages, 3 figure
Fitotipias em ambiente fluvial do Rio Iguaçu e suas relações com padrões geomórficos e tipos de solos.
Biodiversity of prokaryotes from high-elevation grassland organosols of the Parana State, Brazil.
Dendroecologia de Araucaria angustifolia (Araucariaceae) em diferentes condições de crescimento.
Achievable efficiencies for probabilistically cloning the states
We present an example of quantum computational tasks whose performance is
enhanced if we distribute quantum information using quantum cloning.
Furthermore we give achievable efficiencies for probabilistic cloning the
quantum states used in implemented tasks for which cloning provides some
enhancement in performance.Comment: 9 pages, 8 figure
Quantum circuits to measure scalar spin chirality
The scalar spin chirality is a three-body physical observable that plays an
outstanding role both in classical magnetism, characterizing non-coplanar spin
textures, and in quantum magnetism, as an order parameter for chiral spin
liquids. In quantum information, the scalar spin chirality is a witness of
genuine tripartite entanglement. Here we propose an indirect measurement
scheme, based on the Hadamard test, to estimate the scalar spin chirality for
general quantum states. We apply our method to study chirality in two types of
quantum states: generic one-magnon states of a ferromagnet, and the ground
state of a model with competing symmetric and antisymmetric exchange. We show a
single-shot determination of the scalar chirality is possible for chirality
eigenstates, via quantum phase estimation with a single auxiliary qutrit. Our
approach provides a unified theory of chirality in classical and quantum
magnetism.Comment: 5 pages, 3 figure
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