1,686 research outputs found
New Solutions of the Yang-Baxter Equation Based on Root of 1 Representations of the Para-Bose Superalgebra U[osp(1/2)]
New solutions of the quantum Yang-Baxter equation, depending in general on
three arbitrary parameters, are written down. They are based on the root of
unity representations of the quantum orthosymplectic superalgebra \\U, which
were found recently. Representations of the braid group are defined
within any tensorial power of root of 1 \\U modules.Comment: 11 pages, PlainTe
Unitarizable Representations of the Deformed Para-Bose Superalgebra Uq[osp(1/2)] at Roots of 1
The unitarizable irreps of the deformed para-Bose superalgebra , which
is isomorphic to , are classified at being root of 1. New
finite-dimensional irreps of are found. Explicit expressions
for the matrix elements are written down.Comment: 19 pages, PlainTe
Quantum double of Heisenberg-Weyl algebra, its universal R-matrix and their representations
In this paper a new quasi-triangular Hopf algebra as the quantum double of
the Heisenberg-Weyl algebra is presented.Its universal R-matrix is built and
the corresponding representation theory are studied with the explict
construction for the representations of this quantum double. \newpageComment: 12 page
Universal role of correlation entropy in critical phenomena
In statistical physics, if we successively divide an equilibrium system into
two parts, we will face a situation that, within a certain length , the
physics of a subsystem is no longer the same as the original system. Then the
extensive properties of the thermal entropy ABAB is
violated. This observation motivates us to introduce the concept of correlation
entropy between two points, as measured by mutual information in the
information theory, to study the critical phenomena. A rigorous relation is
established to display some drastic features of the non-vanishing correlation
entropy of the subsystem formed by any two distant particles with long-range
correlation. This relation actually indicates the universal role of the
correlation entropy in understanding critical phenomena. We also verify these
analytical studies in terms of two well-studied models for both the thermal and
quantum phase transitions: two-dimensional Ising model and one-dimensional
transverse field Ising model. Therefore, the correlation entropy provides us
with a new physical intuition in critical phenomena from the point of view of
the information theory.Comment: 10 pages, 9 figure
Thapsigargin at non-cytotoxic levels induces a potent host antiviral response that blocks influenza a virus replication
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Influenza A virus is a major global pathogen of humans, and there is an unmet need for effective antivirals. Current antivirals against influenza A virus directly target the virus and are vulnerable to mutational resistance. Harnessing an effective host antiviral response is an attractive alternative. We show that brief exposure to low, non-toxic doses of thapsigargin (TG), an inhibitor of the sarcoplasmic/endoplasmic reticulum (ER) Ca2+ ATPase pump, promptly elicits an extended antiviral state that dramatically blocks influenza A virus production. Crucially, oral administration of TG protected mice against lethal virus infection and reduced virus titres in the lungs of treated mice. TG-induced ER stress unfolded protein response appears as a key driver responsible for activating a spectrum of host antiviral defences that include an enhanced type I/III interferon response. Our findings suggest that TG is potentially a viable host-centric antiviral for the treatment of influenza A virus infection without the inherent problem of drug resistance
Canonical Quantum Teleportation
Canonically conjugated observables such as position-momentum and phase-number
are found to play a 3-fold role in the drama of the quantum teleportation.
Firstly, the common eigenstate of two commuting canonical observables like
phase-difference and number-sum provides the quantum channel between two
systems. Secondly, a similar pair of canonical observables from another two
systems is measured in the Bell operator measurements.Comment: revtex,4 pages,e-mail:[email protected] www.itp.ac.cn/~suncp; The
Institute of Theoretical Physics, Academia Sinica, Beijing 100080, P.R. Chin
Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
A central goal in condensed matter and modern atomic physics is the
exploration of many-body quantum phases and the universal characteristics of
quantum phase transitions in so far as they differ from those established for
thermal phase transitions. Compared with condensed-matter systems, atomic gases
are more precisely constructed and also provide the unique opportunity to
explore quantum dynamics far from equilibrium. Here we identify a second-order
quantum phase transition in a gaseous spinor Bose-Einstein condensate, a
quantum fluid in which superfluidity and magnetism, both associated with
symmetry breaking, are simultaneously realized. Rb spinor condensates
were rapidly quenched across this transition to a ferromagnetic state and
probed using in-situ magnetization imaging to observe spontaneous symmetry
breaking through the formation of spin textures, ferromagnetic domains and
domain walls. The observation of topological defects produced by this symmetry
breaking, identified as polar-core spin-vortices containing non-zero spin
current but no net mass current, represents the first phase-sensitive in-situ
detection of vortices in a gaseous superfluid.Comment: 6 pages, 4 figure
Spin-Nematic Squeezed Vacuum in a Quantum Gas
Using squeezed states it is possible to surpass the standard quantum limit of
measurement uncertainty by reducing the measurement uncertainty of one property
at the expense of another complementary property. Squeezed states were first
demonstrated in optical fields and later with ensembles of pseudo spin-1/2
atoms using non-linear atom-light interactions. Recently, collisional
interactions in ultracold atomic gases have been used to generate a large
degree of quadrature spin squeezing in two-component Bose condensates. For
pseudo spin-1/2 systems, the complementary properties are the different
components of the total spin vector , which fully characterize the state on
an SU(2) Bloch sphere. Here, we measure squeezing in a spin-1 Bose condensate,
an SU(3) system, which requires measurement of the rank-2 nematic or quadrupole
tensor as well to fully characterize the state. Following a quench
through a nematic to ferromagnetic quantum phase transition, squeezing is
observed in the variance of the quadratures up to -8.3(-0.7 +0.6) dB
(-10.3(-0.9 +0.7) dB corrected for detection noise) below the standard quantum
limit. This spin-nematic squeezing is observed for negligible occupation of the
squeezed modes and is analogous to optical two-mode vacuum squeezing. This work
has potential applications to continuous variable quantum information and
quantum-enhanced magnetometry
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