scholarly journals Controlling the dynamics of ultracold polar molecules in optical tweezers

2021 ◽  
Author(s):  
Marta Sroczyńska ◽  
Anna Dawid ◽  
Michał Tomza ◽  
Zbigniew Idziaszek ◽  
Tommaso Calarco ◽  
...  
Keyword(s):  
Quantum Computing ◽  
Optical Tweezers ◽  
Precision Measurements ◽  
Great Promise ◽  
Polar Molecules ◽  
Ultracold Molecules ◽  
Ultracold Polar Molecules ◽  
Qubit States ◽  
Computing Scheme

Abstract Ultracold molecules trapped in optical tweezers show great promise for the implementation of quantum technologies and precision measurements. We study a prototypical scenario where two interacting polar molecules placed in separate traps are controlled using an external electric field. This, for instance, enables a quantum computing scheme in which the rotational structure is used to encode the qubit states. We estimate the typical operation timescales needed for state engineering to be in the range of few microseconds. We further underline the important role of the spatial structure of the two-body states, with the potential for significant gate speedup employing trap-induced resonances.

scholarly journals Universal relations for ultracold reactive molecules

2020 ◽  
Vol 6 (51) ◽  
pp. eabd4699
Author(s):  
Mingyuan He ◽  
Chenwei Lv ◽  
Hai-Qing Lin ◽  
Qi Zhou
Keyword(s):  
Critical Role ◽  
Interaction Strength ◽  
Quantum Correlations ◽  
Polar Molecules ◽  
Many Body ◽  
Density Correlation ◽  
Ultracold Polar Molecules ◽  
Unexplored Area ◽  
Many Body Systems

The realization of ultracold polar molecules in laboratories has pushed physics and chemistry to new realms. In particular, these polar molecules offer scientists unprecedented opportunities to explore chemical reactions in the ultracold regime where quantum effects become profound. However, a key question about how two-body losses depend on quantum correlations in interacting many-body systems remains open so far. Here, we present a number of universal relations that directly connect two-body losses to other physical observables, including the momentum distribution and density correlation functions. These relations, which are valid for arbitrary microscopic parameters, such as the particle number, the temperature, and the interaction strength, unfold the critical role of contacts, a fundamental quantity of dilute quantum systems, in determining the reaction rate of quantum reactive molecules in a many-body environment. Our work opens the door to an unexplored area intertwining quantum chemistry; atomic, molecular, and optical physics; and condensed matter physics.

scholarly journals Observation of microwave shielding of ultracold molecules

Science ◽  
2021 ◽  
Vol 373 (6556) ◽  
pp. 779-782
Author(s):  
Loïc Anderegg ◽  
Sean Burchesky ◽  
Yicheng Bao ◽  
Scarlett S. Yu ◽  
Tijs Karman ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Single Molecule ◽  
Theoretical Calculations ◽  
Microwave Frequency ◽  
Three Dimensions ◽  
Ultracold Molecules ◽  
Microwave Shielding ◽  
Ultracold Polar Molecules ◽  
Calcium Monofluoride ◽  
Quantum Science

Harnessing the potential wide-ranging quantum science applications of molecules will require control of their interactions. Here, we used microwave radiation to directly engineer and tune the interaction potentials between ultracold calcium monofluoride (CaF) molecules. By merging two optical tweezers, each containing a single molecule, we probed collisions in three dimensions. The correct combination of microwave frequency and power created an effective repulsive shield, which suppressed the inelastic loss rate by a factor of six, in agreement with theoretical calculations. The demonstrated microwave shielding shows a general route to the creation of long-lived, dense samples of ultracold polar molecules and evaporative cooling.

scholarly journals A Global Review on Short Peptides: Frontiers and Perspectives

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 430
Author(s):  
Vasso Apostolopoulos ◽  
Joanna Bojarska ◽  
Tsun-Thai Chai ◽  
Sherif Elnagdy ◽  
Krzysztof Kaczmarek ◽  
...  
Keyword(s):  
Protein Interactions ◽  
Targeted Delivery ◽  
Swot Analysis ◽  
Functional Materials ◽  
Great Promise ◽  
Short Peptides ◽  
Altered Peptide Ligands ◽  
Short Peptide ◽  
Domains Of Life

Peptides are fragments of proteins that carry out biological functions. They act as signaling entities via all domains of life and interfere with protein-protein interactions, which are indispensable in bio-processes. Short peptides include fundamental molecular information for a prelude to the symphony of life. They have aroused considerable interest due to their unique features and great promise in innovative bio-therapies. This work focusing on the current state-of-the-art short peptide-based therapeutical developments is the first global review written by researchers from all continents, as a celebration of 100 years of peptide therapeutics since the commencement of insulin therapy in the 1920s. Peptide “drugs” initially played only the role of hormone analogs to balance disorders. Nowadays, they achieve numerous biomedical tasks, can cross membranes, or reach intracellular targets. The role of peptides in bio-processes can hardly be mimicked by other chemical substances. The article is divided into independent sections, which are related to either the progress in short peptide-based theranostics or the problems posing challenge to bio-medicine. In particular, the SWOT analysis of short peptides, their relevance in therapies of diverse diseases, improvements in (bio)synthesis platforms, advanced nano-supramolecular technologies, aptamers, altered peptide ligands and in silico methodologies to overcome peptide limitations, modern smart bio-functional materials, vaccines, and drug/gene-targeted delivery systems are discussed.

scholarly journals The Role of Sodium in Stabilizing Tin-Lead (Sn-Pb) Alloyed Perovskite Quantum Dots

2021 ◽  
Author(s):  
Junke Jiang ◽  
Feng Liu ◽  
Qing Shen ◽  
Shuxia Tao
Keyword(s):  
Quantum Dots ◽  
Phase Stability ◽  
Band Gaps ◽  
Great Promise ◽  
Narrow Bandgap ◽  
Perovskite Quantum Dots ◽  
Optoelectronic Applications

Narrow-bandgap CsSnxPb1-xI3 perovskite quantum dots (QDs) show great promise for optoelectronic applications owing to their reduced use of toxic Pb, improved phase stability, and tunable band gaps in the visible...

Private Wealth, Philanthropy, and Social Development

2016 ◽  
Vol 8 (2) ◽  
pp. 215-248 ◽  
Author(s):  
Francis Barchi ◽  
Guosheng Deng ◽  
Chien-Chung Huang ◽  
Carolyn Isles ◽  
Juliann Vikse
Keyword(s):  
Social Development ◽  
Charitable Giving ◽  
The United States ◽  
Educational Opportunities ◽  
Great Promise ◽  
Income Gap ◽  
Supportive Environment ◽  
Performance Based Funding ◽  
Opportunity Gaps

Growing income inequality has created excessive barriers to social mobility for the poor. Charitable giving by the wealthy can reduce the societal effects of the income gap by reinvestment in public goods such as education. We apply the cipp model to investigate the role of philanthropy in advancing educational opportunities in the United States and China, using historical and contemporary cases of individual philanthropists. The findings suggest that the cases reviewed in this study created mechanisms by which to contribute to social development in their respective countries. Government policies play a key role in philanthropic development, particularly in China. It is important to continue to foster a supportive environment for the sector to grow, which may include expanding tax incentives, emphasizing performance-based funding, and eliminating administrative barriers. In short, educational philanthropy holds great promise for reducing opportunity gaps and economic inequality, by providing the key to success for future generations.

Fe–N–C Electrocatalysts in the Oxygen and Nitrogen Cycles in Alkaline Media: The Role of Iron Carbide

2021 ◽  
Author(s):  
Tomer Y. Burshtein ◽  
Denial Aias ◽  
Jin Wang ◽  
Matan Sananis ◽  
Eliyahu M. Farber ◽  
...  
Keyword(s):  
Free Energy ◽  
Energy Conversion ◽  
Oxygen Reduction ◽  
Iron Carbide ◽  
Alkaline Media ◽  
Great Promise ◽  
Nitrogen Cycles

Fe–N–C electrocatalysts hold a great promise for Pt-free energy conversion, driving the electrocatalysis of oxygen reduction and evolution, oxidation of nitrogen fuels, and reduction of N2, CO2, and NOx. Nevertheless,...

scholarly journals Strength Optimization of Thermally Bonded Spunbond Nonwovens

2007 ◽  
Vol 2 (1) ◽  
pp. 155892500700200 ◽  
Author(s):  
Nataliya Fedorova ◽  
Svetlana Verenich ◽  
Behnam Pourdeyhimi
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Low Density Polyethylene ◽  
Great Promise ◽  
Thermal Bonding ◽  
Bicomponent Fibers ◽  
Nonwoven Materials ◽  
Fiber Technology ◽  
Bicomponent Fiber

Recent research on all aspects of thermally point bonded nonwovens has led to considerable improvements in the understanding of material requirements for these nonwovens, the changes that occur during bonding and the resultant deterioration of the mechanical properties of the nonwoven materials. This paper addresses how one may use a bicomponent fiber technology to overcome the shortcomings of the thermal bonding and obtain high strength spunbond fabrics. In particular, we present the utility of islands-in-the-sea (I/S) bicomponent fibers for optimizing the strength of thermally bonded fabrics. To examine the role of various bonding temperatures on the fabric performance, pre-consolidated webs were formed and subsequently, thermally bonded. Thus, any influence introduced by potential variations in the structure was minimized. Point-bonded bicomponent samples made up of nylon-6 (N6) as the islands and low density polyethylene (PE) as the sea showed great promise with respect to their mechanical properties, suggesting that the use of bicomponent fibers can be beneficial for strength optimization of thermally bonded spunbond nonwovens.

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