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https://www.readbyqxmd.com/read/28644669/entanglement-and-nonlocality-in-infinite-1d-systems
#1
Zizhu Wang, Sukhwinder Singh, Miguel Navascués
We consider the problem of detecting entanglement and nonlocality in one-dimensional (1D) infinite, translation-invariant (TI) systems when just near-neighbor information is available. This issue is deeper than one might think a priori, since, as we show, there exist instances of local separable states (classical boxes) which admit only entangled (nonclassical) TI extensions. We provide a simple characterization of the set of local states of multiseparable TI spin chains and construct a family of linear witnesses which can detect entanglement in infinite TI states from the nearest-neighbor reduced density matrix...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28644656/entanglement-enhanced-phase-estimation-without-prior-phase-information
#2
G Colangelo, F Martin Ciurana, G Puentes, M W Mitchell, R J Sewell
We study the generation of planar quantum squeezed (PQS) states by quantum nondemolition (QND) measurement of an ensemble of ^{87}Rb atoms with a Poisson distributed atom number. Precise calibration of the QND measurement allows us to infer the conditional covariance matrix describing the F_{y} and F_{z} components of the PQS states, revealing the dual squeezing characteristic of PQS states. PQS states have been proposed for single-shot phase estimation without prior knowledge of the likely values of the phase...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28644618/exploring-new-assembly-modes-of-uranyl-terephthalate-templated-syntheses-and-structural-regulation-of-a-series-of-rare-2d-%C3%A2-3d-polycatenated-frameworks
#3
Lei Mei, Cong-Zhi Wang, Liu-Zheng Zhu, Zeng-Qiang Gao, Zhi-Fang Chai, John K Gibson, Wei-Qun Shi
The reaction of uranyl nitrate with terephthalic acid (H2TP) under hydrothermal conditions in the presence of an organic base, 1,3-(4,4'-bispyridyl)propane (BPP) or 4,4'-bipyridine (BPY), provided four uranyl terephthalate compounds with different entangled structures by a pH-tuning method. [UO2(TP)1.5](H2BPP)0.5·2H2O (1) obtained in a relatively acidic solution (final aqueous pH, 4.28) crystallizes in the form of a noninterpenetrated honeycomb-like two-dimensional network structure. An elevation of the solution pH (final pH, 5...
June 23, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28643860/subcutaneous-defibrillators-for-dialysis-patients
#4
REVIEW
Tushar J Vachharajani, Loay Salman, Eric J Costanzo, Sushil K Mehandru, Mayurkumar Patel, Dawn M Calderon, Roy O Mathew, Mandeep S Sidhu, Arif Asif
Defibrillation can be successfully provided by the subcutaneous implantable cardioverter defibrillator (ICD) without the leads. In contrast, traditional ICDs require leads that can cause central venous stenosis, lead-induced endocarditis, and carry the risk of tricuspid regurgitation by valve adhesion, perforation, coaptation interference, or entanglement. Central venous stenosis, infection, and tricuspid regurgitation are all critically important considerations in hemodialysis patients. Recent reports are supporting the use of subcutaneous ICDs in renal patients maintained on long-term hemodialysis...
June 23, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28640260/microscopy-of-the-interacting-harper-hofstadter-model-in-the-two-body-limit
#5
M Eric Tai, Alexander Lukin, Matthew Rispoli, Robert Schittko, Tim Menke, Dan Borgnia, Philipp M Preiss, Fabian Grusdt, Adam M Kaufman, Markus Greiner
The interplay between magnetic fields and interacting particles can lead to exotic phases of matter that exhibit topological order and high degrees of spatial entanglement. Although these phases were discovered in a solid-state setting, recent innovations in systems of ultracold neutral atoms-uncharged atoms that do not naturally experience a Lorentz force-allow the synthesis of artificial magnetic, or gauge, fields. This experimental platform holds promise for exploring exotic physics in fractional quantum Hall systems, owing to the microscopic control and precision that is achievable in cold-atom systems...
June 21, 2017: Nature
https://www.readbyqxmd.com/read/28638101/naked-singularity-firewall-and-hawking-radiation
#6
Hongsheng Zhang
Spacetime singularity has always been of interest since the proof of the Penrose-Hawking singularity theorem. Naked singularity naturally emerges from reasonable initial conditions in the collapsing process. A recent interesting approach in black hole information problem implies that we need a firewall to break the surplus entanglements among the Hawking photons. Classically, the firewall becomes a naked singularity. We find some vacuum analytical solutions in R (n) -gravity of the firewall-type and use these solutions as concrete models to study the naked singularities...
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28636607/three-dimensional-cell-shapes-and-arrangements-in-human-sweat-glands-as-revealed-by-whole-mount-immunostaining
#7
Ryuichiro Kurata, Sugiko Futaki, Itsuko Nakano, Fumitaka Fujita, Atsushi Tanemura, Hiroyuki Murota, Ichiro Katayama, Fumihiro Okada, Kiyotoshi Sekiguchi
Because sweat secretion is facilitated by mechanical contraction of sweat gland structures, understanding their structure-function relationship could lead to more effective treatments for patients with sweat gland disorders such as heat stroke. Conventional histological studies have shown that sweat glands are three-dimensionally coiled tubular structures consisting of ducts and secretory portions, although their detailed structural anatomy remains unclear. To better understand the details of the three-dimensional (3D) coiled structures of sweat glands, a whole-mount staining method was employed to visualize 3D coiled gland structures with sweat gland markers for ductal luminal, ductal basal, secretory luminal, and myoepithelial cells...
2017: PloS One
https://www.readbyqxmd.com/read/28632165/fano-effect-and-quantum-entanglement-in-hybrid-semiconductor-quantum-dot-metal-nanoparticle-system
#8
REVIEW
Yong He, Ka-Di Zhu
In this paper, we review the investigation for the light-matter interaction between surface plasmon field in metal nanoparticle (MNP) and the excitons in semiconductor quantum dots (SQDs) in hybrid SQD-MNP system under the full quantum description. The exciton-plasmon interaction gives rise to the modified decay rate and the exciton energy shift which are related to the exciton energy by using a quantum transformation method. We illustrate the responses of the hybrid SQD-MNP system to external field, and reveal Fano effect shown in the absorption spectrum...
June 20, 2017: Sensors
https://www.readbyqxmd.com/read/28630498/minimal-control-power-of-controlled-dense-coding-and-genuine-tripartite-entanglement
#9
Changhun Oh, Hoyong Kim, Kabgyun Jeong, Hyunseok Jeong
We investigate minimal control power (MCP) for controlled dense coding defined by the channel capacity. We obtain MCPs for extended three-qubit Greenberger-Horne-Zeilinger (GHZ) states and generalized three-qubit W states. Among those GHZ states, the standard GHZ state is found to maximize the MCP and so does the standard W state among the W-type states. We find the lower and upper bounds of the MCP and show for pure states that the lower bound, zero, is achieved if and only if the three-qubit state is biseparable or fully separable...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28630434/metallicity-in-a-holstein-hubbard-chain-at-half-filling-with-gaussian-anharmonicity
#10
Ch Uma Lavanya, I V Sankar, Ashok Chatterjee
The Holstein-Hubbard model with Gaussian phonon anharmonicity is studied in one-dimension at half filling using a variational method based on a series of canonical transformations. A fairly accurate phonon state is chosen to average the transformed Holstein-Hubbard Hamiltonian to obtain an effective Hubbard model which is then solved using the exact Bethe - ansatz following Lieb and Wu to obtain the ground state energy, the average lattice displacement and the renormalized parameters. The Mott-Hubbard criterion, local spin moment and the von Neumann entropy (which is a measure of quantum entanglement) are calculated to determine the ground state phase diagram which shows that the width of the metallic phase flanked by the SDW and CDW phases increases with increasing anharmonicity at low and moderate values of anharmonicity but eventually saturates when the anharmonicity becomes substantially large...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28627043/fabrication-of-millimeter-long-carbon-tubular-nanostructures-using-the-self-rolling-process-inherent-in-elastic-protein-layers
#11
Hyojin Ko, Leila F Deravi, Sung-Jin Park, Jingon Jang, Takhee Lee, Cheong Kang, Jin Seok Lee, Kevin Kit Parker, Kwanwoo Shin
Millimeter-long conducting fibers can be fabricated from carbon nanomaterials via a simple method involving the release of a prestrained protein layer. This study shows how a self-rolling process initiated by polymerization of a micropatterned layer of fibronectin (FN) results in the production of carbon nanomaterial-based microtubular fibers. The process begins with deposition of carbon nanotube (CNT) or graphene oxide (GO) particles on the FN layer. Before polymerization, particles are discrete and nonconducting, but after polymerization the carbon materials become entangled to form an interconnected conducting network clad by FN...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28623315/avalanche-of-entanglement-and-correlations-at-quantum-phase-transitions
#12
Konstantin V Krutitsky, Andreas Osterloh, Ralf Schützhold
We study the ground-state entanglement in the quantum Ising model with nearest neighbor ferromagnetic coupling J and find a sequential increase of entanglement depth d with growing J. This entanglement avalanche starts with two-point entanglement, as measured by the concurrence, and continues via the three-tangle and four-tangle, until finally, deep in the ferromagnetic phase for J = ∞, arriving at a pure L-partite (GHZ type) entanglement of all L spins. Comparison with the two, three, and four-point correlations reveals a similar sequence and shows strong ties to the above entanglement measures for small J...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28621985/quantum-secure-direct-communication-with-quantum-memory
#13
Wei Zhang, Dong-Sheng Ding, Yu-Bo Sheng, Lan Zhou, Bao-Sen Shi, Guang-Can Guo
Quantum communication provides an absolute security advantage, and it has been widely developed over the past 30 years. As an important branch of quantum communication, quantum secure direct communication (QSDC) promotes high security and instantaneousness in communication through directly transmitting messages over a quantum channel. The full implementation of a quantum protocol always requires the ability to control the transfer of a message effectively in the time domain; thus, it is essential to combine QSDC with quantum memory to accomplish the communication task...
June 2, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28619937/satellite-based-entanglement-distribution-over-1200-kilometers
#14
Juan Yin, Yuan Cao, Yu-Huai Li, Sheng-Kai Liao, Liang Zhang, Ji-Gang Ren, Wen-Qi Cai, Wei-Yue Liu, Bo Li, Hui Dai, Guang-Bing Li, Qi-Ming Lu, Yun-Hong Gong, Yu Xu, Shuang-Lin Li, Feng-Zhi Li, Ya-Yun Yin, Zi-Qing Jiang, Ming Li, Jian-Jun Jia, Ge Ren, Dong He, Yi-Lin Zhou, Xiao-Xiang Zhang, Na Wang, Xiang Chang, Zhen-Cai Zhu, Nai-Le Liu, Yu-Ao Chen, Chao-Yang Lu, Rong Shu, Cheng-Zhi Peng, Jian-Yu Wang, Jian-Wei Pan
Long-distance entanglement distribution is essential for both foundational tests of quantum physics and scalable quantum networks. Owing to channel loss, however, the previously achieved distance was limited to ~100 kilometers. Here we demonstrate satellite-based distribution of entangled photon pairs to two locations separated by 1203 kilometers on Earth, through two satellite-to-ground downlinks with a summed length varying from 1600 to 2400 kilometers. We observed a survival of two-photon entanglement and a violation of Bell inequality by 2...
June 16, 2017: Science
https://www.readbyqxmd.com/read/28604705/a-solid-state-source-of-photon-triplets-based-on-quantum-dot-molecules
#15
Milad Khoshnegar, Tobias Huber, Ana Predojević, Dan Dalacu, Maximilian Prilmüller, Jean Lapointe, Xiaohua Wu, Philippe Tamarat, Brahim Lounis, Philip Poole, Gregor Weihs, Hamed Majedi
Producing advanced quantum states of light is a priority in quantum information technologies. In this context, experimental realizations of multipartite photon states would enable improved tests of the foundations of quantum mechanics as well as implementations of complex quantum optical networks and protocols. It is favourable to directly generate these states using solid state systems, for simpler handling and the promise of reversible transfer of quantum information between stationary and flying qubits. Here we use the ground states of two optically active coupled quantum dots to directly produce photon triplets...
June 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28603293/impact-of-uv-irradiation-on-multiwall-carbon-nanotubes-in-nanocomposites-formation-of-entangled-surface-layer-and-mechanisms-of-release-resistance
#16
Tinh Nguyen, Elijah J Petersen, Bastien Pellegrin, Justin M Gorham, Thomas Lam, Minhua Zhao, Lipiin Sung
Multiwall carbon nanotubes (MWCNTs) are nanofillers used in consumer and structural polymeric products to enhance a variety of properties. Under weathering, the polymer matrix will degrade and the nanofillers may be released from the products potentially impacting ecological or human health. In this study, we investigated the degradation of a 0.72 % (by mass) MWCNT/amine-cured epoxy nanocomposite irradiated with high intensity ultraviolet (UV) light at various doses, the effects of UV exposure on the surface accumulation and potential release of MWCNTs, and possible mechanisms for the release resistance of the MWCNT surface layer formed on nanocomposites by UV irradiation...
May 2017: Carbon
https://www.readbyqxmd.com/read/28602187/desi-ms-imaging-and-nmr-spectroscopy-to-investigate-the-influence-of-biodiesel-in-the-structure-of-commercial-rubbers
#17
Lorena M A Silva, Elenilson G Alves Filho, André J Simpson, Marcos R Monteiro, Elaine Cabral, Demian Ifa, Tiago Venâncio
Biodiesel has been introduced as an energetic matrix in several countries around the world. However, the affinity of biodiesel with the components of petrodiesel engines is a growing concern. In order to obtain information regarding the effect of biodiesel on the rubber structure, nuclear magnetic resonance technics under a new technology named as comprehensive multiphase (CMP NMR) and the imaging through desorption electrospray ionization mass spectrometry (DESI-MS imaging) were used. The (1)H CMP-DOSY NMR showed the entrapped fuel into the rubber cavities, which the higher constraint caused by the rubber structure is related to the smaller diffusion coefficient...
October 1, 2017: Talanta
https://www.readbyqxmd.com/read/28600540/electric-field-assisted-3d-fibrous-bioceramic-based-scaffolds-for-bone-tissue-regeneration-fabrication-characterization-and-in-vitro-cellular-activities
#18
Minseong Kim, Hui-Suk Yun, Geun Hyung Kim
Nano/microfibrous structure can induce high cellular activities because of the topological similarity of the extracellular matrix, and thus, are widely used in various tissue regenerative materials. However, the fabrication of a bioceramic (high weight percent)-based 3D microfibrous structure is extremely difficult because of the low process-ability of bioceramics. In addition, three-dimensional (3D) microfibrous structure can induce more realistic cellular behavior when compared to that of 2D fibrous structure...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28598674/multimode-and-long-lived-quantum-correlations-between-photons-and-spins-in-a-crystal
#19
Cyril Laplane, Pierre Jobez, Jean Etesse, Nicolas Gisin, Mikael Afzelius
The realization of quantum networks and quantum repeaters remains an outstanding challenge in quantum communication. These rely on the entanglement of remote matter systems, which in turn requires the creation of quantum correlations between a single photon and a matter system. A practical way to establish such correlations is via spontaneous Raman scattering in atomic ensembles, known as the Duan-Lukin-Cirac-Zoller (DLCZ) scheme. However, time multiplexing is inherently difficult using this method, which leads to low communication rates even in theory...
May 26, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28598673/entangled-dynamics-in-macroscopic-quantum-tunneling-of-bose-einstein-condensates
#20
Diego A Alcala, Joseph A Glick, Lincoln D Carr
Tunneling of a quasibound state is a nonsmooth process in the entangled many-body case. Using time-evolving block decimation, we show that repulsive (attractive) interactions speed up (slow down) tunneling. While the escape time scales exponentially with small interactions, the maximization time of the von Neumann entanglement entropy between the remaining quasibound and escaped atoms scales quadratically. Stronger interactions require higher-order corrections. Entanglement entropy is maximized when about half the atoms have escaped...
May 26, 2017: Physical Review Letters
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