31 research outputs found
A Reconfigurable Quantum Local Area Network Over Deployed Fiber
Practical quantum networking architectures are crucial for scaling the
connection of quantum resources. Yet quantum network testbeds have thus far
underutilized the full capabilities of modern lightwave communications, such as
flexible-grid bandwidth allocation. In this work, we implement flex-grid
entanglement distribution in a deployed network for the first time, connecting
nodes in three distinct campus buildings time-synchronized via the Global
Positioning System (GPS). We quantify the quality of the distributed
polarization entanglement via log-negativity, which offers a generic metric of
link performance in entangled bits per second. After demonstrating successful
entanglement distribution for two allocations of our eight dynamically
reconfigurable channels, we demonstrate remote state preparation -- the first
realization on deployed fiber -- showcasing one possible quantum protocol
enabled by the distributed entanglement network. Our results realize an
advanced paradigm for managing entanglement resources in quantum networks of
ever-increasing complexity and service demands
Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV
We report the first measurement of charged particle elliptic flow in Pb-Pb
collisions at 2.76 TeV with the ALICE detector at the CERN Large Hadron
Collider. The measurement is performed in the central pseudorapidity region
(||<0.8) and transverse momentum range 0.2< < 5.0 GeV/. The
elliptic flow signal v, measured using the 4-particle correlation method,
averaged over transverse momentum and pseudorapidity is 0.087 0.002
(stat) 0.004 (syst) in the 40-50% centrality class. The differential
elliptic flow v reaches a maximum of 0.2 near = 3
GeV/. Compared to RHIC Au-Au collisions at 200 GeV, the elliptic flow
increases by about 30%. Some hydrodynamic model predictions which include
viscous corrections are in agreement with the observed increase.Comment: 10 pages, 4 captioned figures, published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/389
Two-pion Bose-Einstein correlations in central Pb-Pb collisions at = 2.76 TeV
The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb
collisions at TeV at the Large Hadron Collider is
presented. We observe a growing trend with energy now not only for the
longitudinal and the outward but also for the sideward pion source radius. The
pion homogeneity volume and the decoupling time are significantly larger than
those measured at RHIC.Comment: 17 pages, 5 captioned figures, 1 table, authors from page 12,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/388
Suppression of charged particle production at large transverse momentum in central Pb-Pb collisions at TeV
Inclusive transverse momentum spectra of primary charged particles in Pb-Pb
collisions at = 2.76 TeV have been measured by the ALICE
Collaboration at the LHC. The data are presented for central and peripheral
collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross
section. The measured charged particle spectra in and GeV/ are compared to the expectation in pp collisions at the same
, scaled by the number of underlying nucleon-nucleon
collisions. The comparison is expressed in terms of the nuclear modification
factor . The result indicates only weak medium effects ( 0.7) in peripheral collisions. In central collisions,
reaches a minimum of about 0.14 at -7GeV/ and increases
significantly at larger . The measured suppression of high- particles is stronger than that observed at lower collision energies,
indicating that a very dense medium is formed in central Pb-Pb collisions at
the LHC.Comment: 15 pages, 5 captioned figures, 3 tables, authors from page 10,
published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/98
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A cellulose-based photoacoustic sensor to measure heparin concentration and activity in human blood samples
Heparin is an indispensable drug in anticoagulation therapy but with a narrow therapeutic window, which dictates regular testing and dose adjustment. However, current monitoring tools have a long turnaround time or are operator intensive. In this work, we describe a cellulose-based photoacoustic sensor for heparin. The sensors have a turnaround time of 6 min for whole blood samples and 3 min for plasma samples regardless of heparin concentration. These sensors have a limit of detection of 0.28 U/ml heparin in human plasma and 0.29 U/ml in whole blood with a linear response (Pearson's r = 0.99) from 0 to 2 U/ml heparin in plasma and blood samples. The relative standard deviation was < 12.5% in plasma and < 17.5% in whole blood. This approach was validated with heparin-spiked whole human blood and had a linear correlation with the activated partial thromboplastin time (aPTT) (r = 0.99). We then studied 16 sets of clinical samples-these had a linear correlation with the activated clotting time (ACT) (Pearson's r = 0.86, P < 0.0001). The photoacoustic signal was also validated against the cumulative heparin dose (Pearson's r = 0.71, P < 0.0001). This approach could have applications in bed-side heparin assays for continuous heparin monitoring
High-Resolution Array-Based Comparative Genome Hybridization (CGH) Identifies Novel and Recurrent Regions in CLL
Although we have some understanding of the genetic abnormalities occurring in B-cell chronic lymphocytic leukemia (CLL) and their association with clinical outcomes, there is an incomplete comprehension of all of the mutations contributing to disease development and progression. In most abnormalities previously observed, it has been difficult to pinpoint specific candidate genes, reflecting the inadequacy of present tools for assessing chromosomal damage
Thigh-length compression stockings and DVT after stroke
Controversy exists as to whether neoadjuvant chemotherapy improves survival in patients with invasive bladder cancer, despite randomised controlled trials of more than 3000 patients. We undertook a systematic review and meta-analysis to assess the effect of such treatment on survival in patients with this disease
-ray spectroscopy of Xe from -induced reaction
International audienceNuclei around A~130 are interesting to explore the effect of the complex interplay of the single-particle and the collective degrees of freedom on the variety of nuclear shapes and to test the predictive powers of nuclear models at both low and high spins. Having both proton and neutron excitations in the same major shell, the higher spin states in this mass region originate from the coupling of unique parity h11/2 orbital with the other available orbitals. Xe isotopes are known for their shape transitions from prolate to an oblate or triaxial one with increase in neutron number. For example, oblate band is reported in 129Xe [1] whereas in 125Xe, experimental results indicate weak triaxial and a prolate shape [2]. Compared to these lower mass Xe isotopes, spectroscopic data on 131Xe are rather scarce. The previous available data on 131Xe are from -decay studies [3], (, n) [4] and (, 3n) [5] reactions. Being situated close to beta stability line, 131Xe is difficult to populate with any heavy ion induced reaction because of lack of suitable target-projectile combination. With the availability of high efficiency gamma detector array, it is now possible to obtain precise spectroscopic data of yrast and non-yrast structures using Alpha induced reaction