717 research outputs found
Distributed super dense coding over noisy channels
We study multipartite super dense coding in the presence of a covariant noisy
channel. We investigate the case of many senders and one receiver, considering
both unitary and non-unitary encoding. We study the scenarios where the senders
apply local encoding or global encoding. We show that, up to some
pre-processing on the original state, the senders cannot do better encoding
than local, unitary encoding. We then introduce general Pauli channels as a
significant example of covariant maps. Considering Pauli channels, we provide
examples for which the super dense coding capacity is explicitly determined
Distillation protocols: Output entanglement and local mutual information
A complementary behavior between local mutual information and average output
entanglement is derived for arbitrary bipartite ensembles. This leads to bounds
on the yield of entanglement in distillation protocols that involve
disinguishing. This bound is saturated in the hashing protocol for
distillation, for Bell-diagonal states.Comment: 4 pages, RevTeX, no figures; v2: presentation improved, results
unchanged; v3: published versio
Brief of \u3cem\u3eAmici Curiae\u3c/em\u3e Financial Regulation Scholars in \u3cem\u3eSeila Law LLC v. Consumer Financial Protection Bureau\u3c/em\u3e
Peter Conti-Brown, Adam Levitin, and Patricia McCoy—three leading scholars of financial regulation—submitted this brief to the Supreme Court of the United States for the case Seila Law LLC v. Consumer Financial Protection Bureau to lend their expertise on the history and purpose of the Consumer Financial Protection Bureau’s structure. They take no position on the question of severability, but argue that, should the Court not dismiss the case, there are two alternatives that will respect Congress’s constitutional role as the legislative designer of federal administration. First, it can acknowledge that the many accountability-enhancing mechanisms that Congress attached to the CFPB bring it well within the constitutional mainstream and affirm the circuit court’s opinion. Second, it can remand the case for further review of these accountability-enhancing mechanisms. A holistic review of the CFPB’s structure will reveal the constitutional logic of Congress’s design. That record is not currently before the Court, and a remand would permit further review of these design features. What the Court should not do is accept Petitioner’s invitation to depart from the judicial lane and usurp Congress’s constitutional authority
Local governmental audit and accounting manual, as of March 1, 1991: a nonauthoritative practice aid;Notes to the illustrative combined financial statements;
https://egrove.olemiss.edu/aicpa_guides/1005/thumbnail.jp
Spin-Orbit Coupling in LaAlO/SrTiO interfaces: Magnetism and Orbital Ordering
The combination of Rashba spin-orbit coupling and electron correlations can
induce unusual phenomena in the metallic interface between SrTiO and
LaAlO. We consider effects of Rashba spin-orbit coupling at this interface
in the context of the recent observation of anisotropic magnetism. Firstly, we
show how Rashba spin-orbit coupling in a system near a band-edge can account
for the observed magnetic anisotropy. Secondly, we investigate the coupling
between in-plane magnetic-moment anisotropy and nematicity in the form of an
orbital imbalance between d / d orbitals. We estimate this
coupling to be substantial in the low electron density regime. Such an orbital
ordering can affect magneto transport
Locally Accessible Information of Multisite Quantum Ensembles Violates Monogamy
Locally accessible information is a useful information-theoretic physical
quantity of an ensemble of multiparty quantum states. We find it has properties
akin to quantum as well as classical correlations of single multiparty quantum
states. It satisfies monotonicity under local quantum operations and classical
communication. However we show that it does not follow monogamy, an important
property usually satisfied by quantum correlations, and actually violates any
such relation to the maximal extent. Violation is obtained even for locally
indistinguishable, but globally orthogonal, multisite ensembles. The results
assert that while single multiparty quantum states are monogamous with respect
to their shared quantum correlations, ensembles of multiparty quantum states
may not be so. The results have potential implications for quantum
communication systems.Comment: 6 pages, RevTeX
Genuine Multiparty Quantum Entanglement Suppresses Multiport Classical Information Transmission
We establish a universal complementarity relation between the capacity of
classical information transmission by employing a multiparty quantum state as a
multiport quantum channel, and the genuine multipartite entanglement of the
quantum state. The classical information transfer is from a sender to several
receivers by using the quantum dense coding protocol with the multiparty
quantum state shared between the sender and the receivers. The relation holds
for arbitrary pure or mixed quantum states of an arbitrary number of parties in
arbitrary dimensions.Comment: 5 (+ epsilon) pages, 2 figures, Revtex4-1; v2: Theorem 3 extended to
all states, other results unchange
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