56,345 research outputs found
Spectral Anomaly and High Temperature Superconductors
Spectral anomaly for interacting Fermions is characterized by the spectral
function satisfying the scaling relation , where ,
, and are the exponents defining the universality class. For a Fermi
liquid , , ; all other values of the exponents are termed
anomalous. In this paper, an example for which , , but
is considered in detail. Attractive interaction added to such a
critical system leads to a novel superconducting state, which is explored and
its relevance to high temperature cuprate superconductors is discussed.Comment: RevTex, 53 pages (including figures
Observation of Nonlocal Modulation with Entangled Photons
We demonstrate a new type of quantum mechanical correlation where phase
modulators at distant locations, acting on the photons of an entangled pair,
interfere to determine the apparent depth of modulation. When the modulators
have the same phase, the modulation depth doubles; when oppositely phased, the
modulators negate each other.Comment: 4 pages, 4 figure
Criteria for reliable entanglement quantification with finite data
We propose one and a half criteria for determining how many measurements are
needed to quantify entanglement reliably. We base these criteria on Bayesian
analysis of measurement results, and apply our methods to four-qubit
entanglement, but generalizations to more qubits are straightforward.Comment: >4
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