86 research outputs found
A generic framework for genuine multipartite entanglement detection
Design of detection strategies for multipartite entanglement stands as a
central importance on our understanding of fundamental quantum mechanics and
has had substantial impact on quantum information applications. However,
accurate and robust detection approaches are severely hindered, particularly
when the number of nodes grows rapidly like in a quantum network. Here we
present an exquisite procedure that generates novel entanglement witness for
arbitrary targeted state via a generic and operational framework. The framework
enjoys a systematic and high-efficient character and allows to substantiate
genuine multipartite entanglement for a variety of states that arise naturally
in practical situations, and to dramatically outperform currently standard
methods. With excellent noise tolerance, our framework should be broadly
applicable to witness genuine multipartite entanglement in various practically
scenarios, and to facilitate making the best use of entangled resources in the
emerging area of quantum network.Comment: 27 pages, 5 figure
Realigned Hardy's Paradox
Hardy's paradox provides an all-versus-nothing fashion to directly certify
that quantum mechanics cannot be completely described by local realistic
theory. However, when considering potential imperfections in experiments, like
imperfect entanglement source and low detection efficiency, the original
Hardy's paradox may induce a rather small Hardy violation and only be realized
by expensive quantum systems. To overcome this problem, we propose a realigned
Hardy's paradox. Compared with the original version of Hardy's paradox, the
realigned Hardy's paradox can dramatically improve the Hardy violation. Then,
we generalize the realigned Hardy's paradox to arbitrary even dichotomic
measurements. For and cases, the realigned Hardy's paradox can
achieve Hardy values approximate and
respectively compared with of the original Hardy's paradox. Meanwhile,
the structure of the realigned Hardy's paradox is simpler and more robust in
the sense that there is only one Hardy condition rather than three conditions.
One can anticipate that the realigned Hardy's paradox can tolerate more
experimental imperfections and stimulate more fascinating quantum information
applications.Comment: 7 pages, 1 figur
Serum Peptidome Patterns of Colorectal Cancer Based on Magnetic Bead Separation and MALDI-TOF Mass Spectrometry Analysis
Background. Colorectal cancer (CRC) is one of the most common cancers in the world, identification of biomarkers for early detection of CRC represents a relevant target. The present study aims to determine serum peptidome patterns for CRC diagnosis.
Methods. The present work focused on serum proteomic analysis of 32 health volunteers and 38 CRC by ClinProt Kit combined with mass spectrometry. This approach allowed the construction of a peptide patterns able to differentiate the studied populations. An independent group of serum (including 33 health volunteers, 34 CRC, 16 colorectal adenoma, 36 esophageal carcinoma, and 31 gastric carcinoma samples) was used to verify the diagnostic and differential diagnostic capability of the peptidome patterns blindly. An immunoassay method was used to determine serum CEA of CRC and controls. Results. A quick classifier algorithm was used to construct the peptidome patterns for identification of CRC from controls. Two of the identified peaks at m/z 741 and 7772 were used to construct peptidome patterns, achieving an accuracy close to 100% (>CEA, P<0.05). Furthermore, the peptidome patterns could differentiate validation group with high accuracy.
Conclusions. These results suggest that the ClinProt Kit combined with mass spectrometry yields significantly higher accuracy for the diagnosis and differential diagnosis of CRC
Chaotic Signatures of Heart Rate Variability and Its Power Spectrum in Health, Aging and Heart Failure
A paradox regarding the classic power spectral analysis of heart rate variability (HRV) is whether the characteristic high- (HF) and low-frequency (LF) spectral peaks represent stochastic or chaotic phenomena. Resolution of this ftitration undamental issue is key to unraveling the mechanisms of HRV, which is critical to its proper use as a noninvasive marker for cardiac mortality risk assessment and stratification in congestive heart failure (CHF) and other cardiac dysfunctions. However, conventional techniques of nonlinear time series analysis generally lack sufficient sensitivity, specificity and robustness to discriminate chaos from random noise, much less quantify the chaos level. Here, we apply a ‘litmus test’ for heartbeat chaos based on a novel noise assay which affords a robust, specific, time-resolved and quantitative measure of the relative chaos level. Noise titration of running short-segment Holter tachograms from healthy subjects revealed circadian-dependent (or sleep/wake-dependent) heartbeat chaos that was linked to the HF component (respiratory sinus arrhythmia). The relative ‘HF chaos’ levels were similar in young and elderly subjects despite proportional age-related decreases in HF and LF power. In contrast, the near-regular heartbeat in CHF patients was primarily nonchaotic except punctuated by undetected ectopic beats and other abnormal beats, causing transient chaos. Such profound circadian-, age- and CHF-dependent changes in the chaotic and spectral characteristics of HRV were accompanied by little changes in approximate entropy, a measure of signal irregularity. The salient chaotic signatures of HRV in these subject groups reveal distinct autonomic, cardiac, respiratory and circadian/sleep-wake mechanisms that distinguish health and aging from CHF
Epidemiology of Schistosomiasis in the People’s Republic of China, 2004
Although the number of human infections decreased, human prevalence increased from 4.9% in 1995 to 5.1% in 2004
An Updated Search of Steady TeV Ray Point Sources in Northern Hemisphere Using the Tibet Air Shower Array
Using the data taken from Tibet II High Density (HD) Array (1997
February-1999 September) and Tibet-III array (1999 November-2005 November), our
previous northern sky survey for TeV ray point sources has now been
updated by a factor of 2.8 improved statistics. From to
in declination (Dec) range, no new TeV ray point
sources with sufficiently high significance were identified while the
well-known Crab Nebula and Mrk421 remain to be the brightest TeV ray
sources within the field of view of the Tibet air shower array. Based on the
currently available data and at the 90% confidence level (C.L.), the flux upper
limits for different power law index assumption are re-derived, which are
approximately improved by 1.7 times as compared with our previous reported
limits.Comment: This paper has been accepted by hepn
A universal programmable Gaussian Boson Sampler for drug discovery
Gaussian Boson Sampling (GBS) exhibits a unique ability to solve graph
problems, such as finding cliques in complex graphs. It is noteworthy that many
drug discovery tasks can be viewed as the clique-finding process, making them
potentially suitable for quantum computation. However, to perform these tasks
in their quantum-enhanced form, a large-scale quantum hardware with universal
programmability is essential, which is yet to be achieved even with the most
advanced GBS devices. Here, we construct a time-bin encoded GBS photonic
quantum processor that is universal, programmable, and software-scalable. Our
processor features freely adjustable squeezing parameters and can implement
arbitrary unitary operations with a programmable interferometer. Using our
processor, we have demonstrated the clique-finding task in a 32-node graph,
where we found the maximum weighted clique with approximately twice the
probability of success compared to classical sampling. Furthermore, a
multifunctional quantum pharmaceutical platform is developed. This GBS
processor is successfully used to execute two different drug discovery methods,
namely molecular docking and RNA folding prediction. Our work achieves the
state-of-the-art in GBS circuitry with its distinctive universal and
programmable architecture which advances GBS towards real-world applications.Comment: 10 pages, 5 figure
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