1,131 research outputs found
From Petrov-Einstein-Dilaton-Axion to Navier-Stokes equation in anisotropic model
In this paper we generalize the previous works to the case that the
near-horizon dynamics of the Einstein-Dilaton-Axion theory can be governed by
the incompressible Navier-Stokes equation via imposing the Petrov-like boundary
condition on hypersurfaces in the non-relativistic and near-horizon limit. The
dynamical shear viscosity of such dual horizon fluid in our scenario,
which isotropically saturates the Kovtun-Son-Starinet (KSS) bound, is
independent of both the dilaton field and axion field in that limit.Comment: 13 pages,no figures; v2: 15 page, Equation.(33), some discussions and
references added, minor corrections , Version accepted for publication in
Physics Letters
Security analysis of quantum key distribution with small block length and its application to quantum space communications
The security of real-world quantum key distribution (QKD) critically depends
on the number of data points the system can collect in a fixed time interval.
To date, state-of-the-art finite-key security analyses require block lengths in
the order of 1E4 bits to obtain positive secret keys. This requirement,
however, can be very difficult to achieve in practice, especially in the case
of entanglement-based satellite QKD systems, where the overall channel loss can
go up to 70 dB or more. Here, we provide an improved finite-key security
analysis which can reduce the block length requirement by 14% to 17% for
standard channel and protocol settings. In practical terms, this reduction
could save entanglement-based satellite QKD weeks of measurement time and
resources, thereby bringing space-based QKD technology closer to reality. As an
application, we use the improved analysis to show that the recently reported
Micius QKD satellite is capable of generating positive secret keys with a
security level.Comment: Revised draft; 5 pages, 1 figure. We warmly welcome
comments/corrections, as well as suggestions for additional areas to stud
miR-638 is a new biomarker for outcome prediction of non-small cell lung cancer patients receiving chemotherapy.
MicroRNAs (miRNAs), a class of small non-coding RNAs, mediate gene expression by either cleaving target mRNAs or inhibiting their translation. They have key roles in the tumorigenesis of several cancers, including non-small cell lung cancer (NSCLC). The aim of this study was to investigate the clinical significance of miR-638 in the evaluation of NSCLC patient prognosis in response to chemotherapy. First, we detected miR-638 expression levels in vitro in the culture supernatants of the NSCLC cell line SPC-A1 treated with cisplatin, as well as the apoptosis rates of SPC-A1. Second, serum miR-638 expression levels were detected in vivo by using nude mice xenograft models bearing SPC-A1 with and without cisplatin treatment. In the clinic, the serum miR-638 levels of 200 cases of NSCLC patients before and after chemotherapy were determined by quantitative real-time PCR, and the associations of clinicopathological features with miR-638 expression patterns after chemotherapy were analyzed. Our data helped in demonstrating that cisplatin induced apoptosis of the SPC-A1 cells in a dose- and time-dependent manner accompanied by increased miR-638 expression levels in the culture supernatants. In vivo data further revealed that cisplatin induced miR-638 upregulation in the serum derived from mice xenograft models, and in NSCLC patient sera, miR-638 expression patterns after chemotherapy significantly correlated with lymph node metastasis. Moreover, survival analyses revealed that patients who had increased miR-638 levels after chemotherapy showed significantly longer survival time than those who had decreased miR-638 levels. Our findings suggest that serum miR-638 levels are associated with the survival of NSCLC patients and may be considered a potential independent predictor for NSCLC prognosis
Demonstrating anyonic fractional statistics with a six-qubit quantum simulator
Anyons are exotic quasiparticles living in two dimensions that do not fit
into the usual categories of fermions and bosons, but obey a new form of
fractional statistics. Following a recent proposal [Phys. Rev. Lett. 98, 150404
(2007)], we present an experimental demonstration of the fractional statistics
of anyons in the Kitaev spin lattice model using a photonic quantum simulator.
We dynamically create the ground state and excited states (which are six-qubit
graph states) of the Kitaev model Hamiltonian, and implement the anyonic
braiding and fusion operations by single-qubit rotations. A phase shift of
related to the anyon braiding is observed, confirming the prediction of
the fractional statistics of Abelian 1/2-anyons.Comment: revised version 3, revTex, 4.3 pages, 4 figures, notes and reference
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