keyword
MENU ▼
Read by QxMD icon Read
search

Multiple quantum coherence

keyword
https://www.readbyqxmd.com/read/28732157/large-scale-statistics-for-threshold-optimization-of-optically-pumped-nanowire-lasers
#1
Juan Arturo Alanis, Dhruv Saxena, Sudha Mokkapati, Nian Jiang, Kun Peng, Xiaoyan Tang, Lan Fu, Hark Hoe Tan, Chennupati Jagadish, Patrick Parkinson
Single nanowire lasers based on bottom-up III-V materials have been shown to exhibit room-temperature near-infrared lasing, making them highly promising for use as nanoscale, silicon-integrable and coherent light sources. While lasing behavior is reproducible, small variations in growth conditions across a substrate arising from the use of bottom-up growth techniques can introduce inter-wire disorder, either through geometric or material inhomogeneity. Nanolasers critically depend on both high material quality and tight dimensional tolerances, and as such, lasing threshold is both sensitive to, and a sensitive probe of such inhomogeneity...
July 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28688401/probing-photoisomerization-processes-by-means-of-multi-dimensional-electronic-spectroscopy-the-multi-state-quantum-hierarchical-fokker-planck-equation-approach
#2
Tatsushi Ikeda, Yoshitaka Tanimura
Photoisomerization in a system with multiple electronic states and anharmonic potential surfaces in a dissipative environment is investigated using a rigorous numerical method employing quantum hierarchical Fokker-Planck equations (QHFPEs) for multi-state systems. We have developed a computer code incorporating QHFPE for general-purpose computing on graphics processing units that can treat multi-state systems in phase space with any strength of diabatic coupling of electronic states under non-perturbative and non-Markovian system-bath interactions...
July 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28684798/experimental-demonstration-of-robust-entanglement-distribution-over-reciprocal-noisy-channels-assisted-by-a-counter-propagating-classical-reference-light
#3
Rikizo Ikuta, Shota Nozaki, Takashi Yamamoto, Masato Koashi, Nobuyuki Imoto
Embedding a quantum state in a decoherence-free subspace (DFS) formed by multiple photons is one of the promising methods for robust entanglement distribution of photonic states over collective noisy channels. In practice, however, such a scheme suffers from a low efficiency proportional to transmittance of the channel to the power of the number of photons forming the DFS. The use of a counter-propagating coherent pulse can improve the efficiency to scale linearly in the channel transmission, but it achieves only protection against phase noises...
July 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28680042/coherent-manipulation-of-valley-states-at-multiple-charge-configurations-of-a-silicon-quantum-dot-device
#4
Joshua S Schoenfield, Blake M Freeman, HongWen Jiang
Qubits based on silicon quantum dots are emerging as leading candidates for the solid-state implementation of quantum information processing. In silicon, valley states represent a degree of freedom in addition to spin and charge. Characterizing and controlling valley states is critical for the encoding and read-out of electrons-in-silicon-based qubits. Here, we report the coherent manipulation of a qubit, which is based on the two valley states of an electron confined in a silicon quantum dot. We carry out valley qubit operations at multiple charge configurations of the double quantum dot device...
July 5, 2017: Nature Communications
https://www.readbyqxmd.com/read/28665647/multiple-quantum-transitions-and-charge-induced-decoherence-of-donor-nuclear-spins-in-silicon
#5
David P Franke, Moritz P D Pflüger, Kohei M Itoh, Martin S Brandt
We study single- and multiquantum transitions of the nuclear spins of an ensemble of ionized arsenic donors in silicon and find quadrupolar effects on the coherence times, which we link to fluctuating electrical field gradients present after the application of light and bias voltage pulses. To determine the coherence times of superpositions of all orders in the 4-dimensional Hilbert space, we use a phase-cycling technique and find that, when electrical effects were allowed to decay, these times scale as expected for a fieldlike decoherence mechanism such as the interaction with surrounding ^{29}Si nuclear spins...
June 16, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28658228/on-chip-generation-of-high-dimensional-entangled-quantum-states-and-their-coherent-control
#6
Michael Kues, Christian Reimer, Piotr Roztocki, Luis Romero Cortés, Stefania Sciara, Benjamin Wetzel, Yanbing Zhang, Alfonso Cino, Sai T Chu, Brent E Little, David J Moss, Lucia Caspani, José Azaña, Roberto Morandotti
Optical quantum states based on entangled photons are essential for solving questions in fundamental physics and are at the heart of quantum information science. Specifically, the realization of high-dimensional states (D-level quantum systems, that is, qudits, with D > 2) and their control are necessary for fundamental investigations of quantum mechanics, for increasing the sensitivity of quantum imaging schemes, for improving the robustness and key rate of quantum communication protocols, for enabling a richer variety of quantum simulations, and for achieving more efficient and error-tolerant quantum computation...
June 28, 2017: Nature
https://www.readbyqxmd.com/read/28656961/neutral-and-charged-inter-valley-biexcitons-in-monolayer-mose2
#7
Kai Hao, Judith F Specht, Philipp Nagler, Lixiang Xu, Kha Tran, Akshay Singh, Chandriker Kavir Dass, Christian Schüller, Tobias Korn, Marten Richter, Andreas Knorr, Xiaoqin Li, Galan Moody
In atomically thin transition metal dichalcogenides (TMDs), reduced dielectric screening of the Coulomb interaction leads to strongly correlated many-body states, including excitons and trions, that dominate the optical properties. Higher-order states, such as bound biexcitons, are possible but are difficult to identify unambiguously using linear optical spectroscopy methods. Here, we implement polarization-resolved two-dimensional coherent spectroscopy (2DCS) to unravel the complex optical response of monolayer MoSe2 and identify multiple higher-order correlated states...
June 28, 2017: Nature Communications
https://www.readbyqxmd.com/read/28652491/quantum-communication-with-coherent-states-of-light
#8
REVIEW
Imran Khan, Dominique Elser, Thomas Dirmeier, Christoph Marquardt, Gerd Leuchs
Quantum communication offers long-term security especially, but not only, relevant to government and industrial users. It is worth noting that, for the first time in the history of cryptographic encoding, we are currently in the situation that secure communication can be based on the fundamental laws of physics (information theoretical security) rather than on algorithmic security relying on the complexity of algorithms, which is periodically endangered as standard computer technology advances. On a fundamental level, the security of quantum key distribution (QKD) relies on the non-orthogonality of the quantum states used...
August 6, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28613884/carbohydrate-polypeptide-contacts-in-the-antibody-receptor-cd16a-identified-through-solution-nmr-spectroscopy
#9
Ganesh P Subedi, Daniel J Falconer, Adam W Barb
Asparagine-linked carbohydrates (N-glycans) are common modifications of eukaryotic proteins that confer multiple properties, including the essential stabilization of therapeutic monoclonal antibodies. Here we present a rapid and efficient strategy for identifying N-glycans that contact polypeptide residues and apply the method to profile the five N-glycans attached to the human antibody receptor CD16A (Fc γ receptor IIIA). Human embryonic kidney 293S cells expressed CD16A with (13)CU-labeled N-glycans using standard protein expression techniques and medium supplemented with 3 g/L [(13)CU]glucose...
June 27, 2017: Biochemistry
https://www.readbyqxmd.com/read/28581812/additive-classical-capacity-of-quantum-channels-assisted-by-noisy-entanglement
#10
Quntao Zhuang, Elton Yechao Zhu, Peter W Shor
We give a capacity formula for the classical information transmission over a noisy quantum channel, with separable encoding by the sender and limited resources provided by the receiver's preshared ancilla. Instead of a pure state, we consider the signal-ancilla pair in a mixed state, purified by a "witness." Thus, the signal-witness correlation limits the resource available from the signal-ancilla correlation. Our formula characterizes the utility of different forms of resources, including noisy or limited entanglement assistance, for classical communication...
May 19, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28569753/ultrafast-terahertz-snapshots-of-excitonic-rydberg-states-and-electronic-coherence-in-an-organometal-halide-perovskite
#11
Liang Luo, Long Men, Zhaoyu Liu, Yaroslav Mudryk, Xin Zhao, Yongxin Yao, Joong M Park, Ruth Shinar, Joseph Shinar, Kai-Ming Ho, Ilias E Perakis, Javier Vela, Jigang Wang
How photoexcitations evolve into Coulomb-bound electron and hole pairs, called excitons, and unbound charge carriers is a key cross-cutting issue in photovoltaics and optoelectronics. Until now, the initial quantum dynamics following photoexcitation remains elusive in the hybrid perovskite system. Here we reveal excitonic Rydberg states with distinct formation pathways by observing the multiple resonant, internal quantum transitions using ultrafast terahertz quasi-particle transport. Nonequilibrium emergent states evolve with a complex co-existence of excitons, carriers and phonons, where a delayed buildup of excitons under on- and off-resonant pumping conditions allows us to distinguish between the loss of electronic coherence and hot state cooling processes...
June 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/28558273/evolution-of-multiple-quantum-coherences-with-scaled-dipolar-hamiltonian
#12
Claudia M Sánchez, Lisandro Buljubasich, Horacio M Pastawski, Ana K Chattah
In this article, we introduce a pulse sequence which allows the monitoring of multiple quantum coherences distribution of correlated spin states developed with scaled dipolar Hamiltonian. The pulse sequence is a modification of our previous Proportionally Refocused Loschmidt echo (PRL echo) with phase increment, in order to verify the accuracy of the weighted coherent quantum dynamics. The experiments were carried out with different scaling factors to analyze the evolution of the total magnetization, the time dependence of the multiple quantum coherence orders, and the development of correlated spins clusters...
May 20, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28527462/low-power-broadband-solid-state-mas-nmr-of-14-n
#13
Andrew J Pell, Kevin J Sanders, Sebastian Wegner, Guido Pintacuda, Clare P Grey
We propose two broadband pulse schemes for (14)N solid-state magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) that achieves (i) complete population inversion and (ii) efficient excitation of the double-quantum spectrum using low-power single-sideband-selective pulses. We give a comprehensive theoretical description of both schemes using a common framework that is based on the jolting-frame formalism of Caravatti et al. [J. Magn. Reson. 55, 88 (1983)]. This formalism is used to determine for the first time that we can obtain complete population inversion of (14)N under low-power conditions, which we do here using single-sideband-selective adiabatic pulses...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28393853/continuous-variable-quantum-authentication-of-physical-unclonable-keys
#14
Georgios M Nikolopoulos, Eleni Diamanti
We propose a scheme for authentication of physical keys that are materialized by optical multiple-scattering media. The authentication relies on the optical response of the key when probed by randomly selected coherent states of light, and the use of standard wavefront-shaping techniques that direct the scattered photons coherently to a specific target mode at the output. The quadratures of the electromagnetic field of the scattered light at the target mode are analysed using a homodyne detection scheme, and the acceptance or rejection of the key is decided upon the outcomes of the measurements...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28375700/applications-of-the-new-family-of-coherent-multidimensional-spectroscopies-for-analytical-chemistry
#15
John C Wright
A new family of vibrational and electronic spectroscopies has emerged, comprising the coherent analogs of traditional analytical methods. These methods are also analogs of coherent multidimensional nuclear magnetic resonance (NMR) spectroscopy. This new family is based on creating the same quantum mechanical superposition states called multiple quantum coherences (MQCs). NMR MQCs are mixtures of nuclear spin states that retain their quantum mechanical phase information for milliseconds. The MQCs in this new family are mixtures of vibrational and electronic states that retain their phases for picoseconds or shorter times...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28334529/ballistic-one-dimensional-inas-nanowire-cross-junction-interconnects
#16
Johannes Gooth, Mattias Borg, Heinz Schmid, Vanessa Schaller, Stephan Wirths, Kirsten Moselund, Mathieu Luisier, Siegfried Karg, Heike Riel
Coherent interconnection of quantum bits remains an ongoing challenge in quantum information technology. Envisioned hardware to achieve this goal is based on semiconductor nanowire (NW) circuits, comprising individual NW devices that are linked through ballistic interconnects. However, maintaining the sensitive ballistic conduction and confinement conditions across NW intersections is a nontrivial problem. Here, we go beyond the characterization of a single NW device and demonstrate ballistic one-dimensional (1D) quantum transport in InAs NW cross-junctions, monolithically integrated on Si...
March 27, 2017: Nano Letters
https://www.readbyqxmd.com/read/28319388/visualizing-intramolecular-vibrational-redistribution-in-cyclotrimethylene-trinitramine-rdx-crystals-by-multiplex-coherent-anti-stokes-raman-scattering
#17
Guoyang Yu, Yangyang Zeng, Wencan Guo, Honglin Wu, Gangbei Zhu, Zhaoyang Zheng, Xianxu Zheng, Yunfei Song, Yanqiang Yang
The femtosecond time-resolved multiplex coherent anti-Stokes Raman scattering (CARS) technique has been performed to investigate intramolecular vibrational redistribution (IVR) through vibrational couplings in 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) molecules. In the multiplex CARS experiment, the supercontinuum (SC) was used as broad-band Stokes light to coherently and collectively excite multiple vibrational modes, and quantum beats arising from vibrational couplings among these modes were observed. The IVR of RDX is visualized by a topological graph of these vibrational couplings, and with analysis of the topological graph, two vibrational modes, both of which are assigned to ring bending, are confirmed to have coupling interactions with most of the other vibrational modes and are considered to have a tendency of energy transfer with these vibrational modes...
March 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28297938/extracting-trajectory-equations-of-classical-periodic-orbits-from-the-quantum-eigenmodes-in-two-dimensional-integrable-billiards
#18
Y H Hsieh, Y T Yu, P H Tuan, J C Tung, K F Huang, Y F Chen
The trajectory equations for classical periodic orbits in the equilateral-triangular and circular billiards are systematically extracted from quantum stationary coherent states. The relationship between the phase factors of quantum stationary coherent states and the initial positions of classical periodic orbits is analytically derived. In addition, the stationary coherent states with noncoprime parametric numbers are shown to correspond to the multiple periodic orbits, which cannot be explicable in the one-particle picture...
February 2017: Physical Review. E
https://www.readbyqxmd.com/read/28250346/an-efficient-strategy-for-the-synthesis-of-1-trifluoromethylsulfonamido-propan-2-yl-esters-and-the-evaluation-of-their-cytotoxic-activity
#19
Omar Gómez-García, Elizabeth Gómez, César Monzón-González, Teresa Ramírez-Apan, Cecilio Álvarez-Toledano
An efficient method for the synthesis of 1-(trifluoromethylsulfonamido)propan-2-yl benzoates is described, the products of the reaction were characterized by heteronuclear single quantum coherence spectroscopy (HSQC), heteronuclear multiple bond correlation (HMBC) and NMR experiments. The overall process began with the activation of the oxazoline ring by triflic anhydride, followed by the opening of the five-membered ring in the 5-methyl-2-phenyl-4,5-dihydrooxazole system. The cytotoxic activity of the new trifluoromethyl sulfonamides was evaluated with six cancer cell lines and human gingival fibroblasts, posteriorly analyzing the influence on cytotoxicity exerted by the withdrawing and donor substituents at the para-position of the phenyl ring...
2017: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28193069/comprehensive-metabolite-identification-strategy-using-multiple-two-dimensional-nmr-spectra-of-a-complex-mixture-implemented-in-the-colmarm-web-server
#20
Kerem Bingol, Da-Wei Li, Bo Zhang, Rafael Brüschweiler
Identification of metabolites in complex mixtures represents a key step in metabolomics. A new strategy is introduced, which is implemented in a new public web server, COLMARm, that permits the coanalysis of up to three two-dimensional (2D) NMR spectra, namely, (13)C-(1)H HSQC (heteronuclear single quantum coherence spectroscopy), (1)H-(1)H TOCSY (total correlation spectroscopy), and (13)C-(1)H HSQC-TOCSY, for the comprehensive, accurate, and efficient performance of this task. The highly versatile and interactive nature of COLMARm permits its application to a wide range of metabolomics samples independent of the magnetic field...
December 20, 2016: Analytical Chemistry
keyword
keyword
109161
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"