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Quantum steering for more precise measurements

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Einstein-Podolski-Rosen correlations can be used for precision measurements. (Image: Jurik Peter, Shutterstock)
Einstein-Podolski-Rosen correlations can be used for precision measurements. (Image: Jurik Peter, Shutterstock)

Abstract:
Quantum systems consisting of several particles can be used to measure magnetic or electric fields more precisely. A young physicist at the University of Basel has now proposed a new scheme for such measurements that uses a particular kind of correlation between quantum particles.

Quantum steering for more precise measurements


Basel, Switzerland | Posted on April 23rd, 2021

In quantum information, the fictitious agents Alice and Bob are often used to illustrate complex communication tasks. In one such process, Alice can use entangled quantum particles such as photons to transmit or “teleport” a quantum state – unknown even to herself – to Bob, something that is not feasible using traditional communications.

However, it has been unclear whether the team Alice-Bob can use similar quantum states for other things besides communication. A young physicist at the University of Basel has now shown how particular types of quantum states can be used to perform measurements with higher precision than quantum physics would ordinarily allow. The results have been published in the scientific journal Nature Communications.

Quantum steering at a distance

Together with researchers in Great Britain and France, Dr. Matteo Fadel, who works at the Physics Department of the University of Basel, has thought about how high-precision measurement tasks can be tackled with the help of so-called quantum steering.

Quantum steering describes the fact that in certain quantum states of systems consisting of two particles, a measurement on the first particle allows one to make more precise predictions about possible measurement results on the second particle than quantum mechanics would allow if only the measurement on the second particle had been made. It is just as if the measurement on the first particle had “steered” the state of the second one.

This phenomenon is also known as the EPR paradox, named after Albert Einstein, Boris Podolsky and Nathan Rosen, who first described it in 1935. What is remarkable about it is that it works even if the particles are far apart because they are quantum-mechanically ?entangled? and can feel each other at a distance. This is also what allows Alice to transmit her quantum state to Bob in quantum teleportation.

“For quantum steering, the particles have to be entangled with each other in a very particular fashion,” Fadel explains. “We were interested in understanding whether this could be used for making better measurements.” The measurement procedure he proposes consists of Alice’s performing a measurement on her particle and transmitting the result to Bob.

Thanks to quantum steering, Bob can then adjust his measurement apparatus such that the measurement error on his particle is smaller than it would have been without Alice’s information. In this way, Bob can measure, for instance, magnetic or electric fields acting on his particles with high precision.

Systematic study of steering-enhanced measurements

The study of Fadel and his colleagues now makes it possible to systematically study and demonstrate the usefulness of quantum steering for metrological applications. “The idea for this arose from an experiment we already did in 2018 in the laboratory of Professor Philipp Treutlein at the University of Basel,” says Fadel.

“In that experiment, we were able to measure quantum steering for the first time between two clouds containing hundreds of cold atoms each. After that, we asked ourselves whether it might be possible to do something useful with that.” In his work, Fadel has now created a solid mathematical basis for realizing real-life measurement applications that use quantum steering as a resource.

“In a few simple cases, we already knew that there was a connection between the EPR paradox and precision measurements,” Treutlein says. “But now we have a general theoretical framework, based on which we can also develop new strategies for quantum metrology.” Researchers are already working on demonstrating Fadel’s ideas experimentally. In the future, this could result in new quantum-enhanced measurement devices.

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Reto Caluori
41-612-072-495

@UniBasel_en

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Polarization-sensitive photodetection using 2D/3D perovskite heterostructure crystal

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Home > Press > Polarization-sensitive photodetection using 2D/3D perovskite heterostructure crystal

(a) Schematic structure of polarized light detector. (b) Photoconductivity parallel and perpendicular to the interface. (c) Photoconductivity anisotropy versus excitation power. (d) Angle-resolved photocurrent as a function of polarization angle measured at 405 nm under zero bias. (e) Experimental polarization ratios of some reported polarized light detectors. (f) Angle-dependent photocurrent of the present device measured at different temperature. CREDIT
@Science China Press
(a) Schematic structure of polarized light detector. (b) Photoconductivity parallel and perpendicular to the interface. (c) Photoconductivity anisotropy versus excitation power. (d) Angle-resolved photocurrent as a function of polarization angle measured at 405 nm under zero bias. (e) Experimental polarization ratios of some reported polarized light detectors. (f) Angle-dependent photocurrent of the present device measured at different temperature. CREDIT
@Science China Press

Abstract:
Polarization-sensitive photodetectors, based on anisotropic semiconductors, have exhibited wide advantages in specialized applications, such as astronomy, remote sensing, and polarization-division multiplexing. For the active layer of polarization-sensitive photodetectors, recent researches focus on two-dimensional (2D) organic-inorganic hybrid perovskites, where inorganic slabs and organic spacers are alternatively arranged in parallel layered structures. Compared with inorganic 2D materials, importantly, the solution accessibility of hybrid perovskites makes it possible to obtain their large crystals at low cost, offering exciting opportunities to incorporate crystal out-of-plane anisotropy for polarization-sensitive photodetection. However, limited by the absorption anisotropy of the material structure, polarization sensitivity of such a device remains low. Thus, a new strategy to design 2D hybrid perovskites with large anisotropy for polarization-sensitive photodetection is urgently needed.

Polarization-sensitive photodetection using 2D/3D perovskite heterostructure crystal


Beijing, China | Posted on May 4th, 2021

Heterostructures provide a clue to address this challenge. On the one hand, construction of heterostructures can improve the optical absorption and free-carrier densities of the composite. On the other hand, the built-in electric field at the heterojunction can spatially separate the photogenerated electron-hole pairs, significantly reducing the recombination rate and further enhancing the sensitivity for polarization-sensitive photodetectors. Therefore, constructing single-crystalline heterostructures of anisotropic 2D hybrid perovskites would realize devices with high polarization sensitivity.

In a new research article published in the Beijing-based National Science Review, scientists at the Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences create a 2D/3D heterostructure crystal, combining the 2D hybrid perovskite with its 3D counterpart; and achieve polarization-sensitive photodetection with record-high performance. Different from the previous work, devices based on the heterostructure crystal deliberately leverage the anisotropy of 2D perovskite and the built-in electric field of heterostructure, permitting the first demonstration of a perovskite heterostructure-based polarization-sensitive photodetector that operates without the need for external energy supply. Notably, the polarization sensitivity of the device surpasses all of the reported perovskite-based devices; and can be competitive with conventional inorganic heterostructure-based photodetectors. Further studies disclose that the built-in electric field formed at the heterojunction can efficiently separate those photogenerated excitons, reducing their recombination rate and therefore enhancing the performance of the resulting polarization-sensitive photodetector.

“High polarization sensitivity is successfully achieved in self-driven polarization-sensitive photodetector based on a single-crystalline 2D/3D hybrid perovskite heterostructure which is grown via a delicate solution method,” the author claims, “This innovative study broadens the choice of materials that can be used for high-performance polarization-sensitive photodetectors, and correspondingly, the design strategies.”

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This research received funding from the the National Natural Science Foundation of China, the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS), the Natural Science Foundation of Fujian Province, the Strategic Priority Research Program of the CAS and the Youth Innovation Promotion of CAS.

####

About Science China Press
The National Science Review is the first comprehensive scholarly journal released in English in China that is aimed at linking the country’s rapidly advancing community of scientists with the global frontiers of science and technology. The journal also aims to shine a worldwide spotlight on scientific research advances across China.

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Junhua Luo

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With a zap of light, system switches objects’ colors and patterns: “Programmable matter” technique could enable product designers to churn out prototypes with ease

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Home > Press > With a zap of light, system switches objects’ colors and patterns: “Programmable matter” technique could enable product designers to churn out prototypes with ease

A new system uses UV light projected onto objects coated with light-activated dye to alter the reflective properties of the dye, creating images in minutes. CREDIT
Image courtesy of Michael Wessley, Stefanie Mueller, et al
A new system uses UV light projected onto objects coated with light-activated dye to alter the reflective properties of the dye, creating images in minutes. CREDIT
Image courtesy of Michael Wessley, Stefanie Mueller, et al

Abstract:
When was the last time you repainted your car? Redesigned your coffee mug collection? Gave your shoes a colorful facelift?

With a zap of light, system switches objects’ colors and patterns: “Programmable matter” technique could enable product designers to churn out prototypes with ease


Cambridge, MA | Posted on May 6th, 2021

You likely answered: never, never, and never. You might consider these arduous tasks not worth the effort. But a new color-shifting “programmable matter” system could change that with a zap of light.

MIT researchers have developed a way to rapidly update imagery on object surfaces. The system, dubbed “ChromoUpdate” pairs an ultraviolet (UV) light projector with items coated in light-activated dye. The projected light alters the reflective properties of the dye, creating colorful new images in just a few minutes. The advance could accelerate product development, enabling product designers to churn through prototypes without getting bogged down with painting or printing.

ChromoUpdate “takes advantage of fast programming cycles — things that wouldn’t have been possible before,” says Michael Wessley, the study’s lead author and a postdoc in MIT’s Computer Science and Artificial Intelligence Laboratory.

The research will be presented at the ACM Conference on Human Factors in Computing Systems this month. Wessely’s co-authors include his advisor, Professor Stefanie Mueller, as well as postdoc Yuhua Jin, recent graduate Cattalyya Nuengsigkapian ’19, MNG ’20, visiting master’s student Aleksei Kashapov, postdoc Isabel Qamar, and Professor Dzmitry Tsetserukou of the Skolkovo Institute of Science and Technology.

ChromoUpdate builds on the researchers’ previous programmable matter system, called PhotoChromeleon. That method was “the first to show that we can have high-resolution, multicolor textures that we can just reprogram over and over again,” says Wessely. PhotoChromeleon used a lacquer-like ink comprising cyan, magenta, and yellow dyes. The user covered an object with a layer of the ink, which could then be reprogrammed using light. First, UV light from an LED was shone on the ink, fully saturating the dyes. Next, the dyes were selectively desaturated with a visible light projector, bringing each pixel to its desired color and leaving behind the final image. PhotoChromeleon was innovative, but it was sluggish. It took about 20 minutes to update an image. “We can accelerate the process,” says Wessely.

They achieved that with ChromoUpdate, by fine-tuning the UV saturation process. Rather than using an LED, which uniformly blasts the entire surface, ChromoUpdate uses a UV projector that can vary light levels across the surface. So, the operator has pixel-level control over saturation levels. “We can saturate the material locally in the exact pattern we want,” says Wessely. That saves time — someone designing a car’s exterior might simply want to add racing stripes to an otherwise completed design. ChromoUpdate lets them do just that, without erasing and reprojecting the entire exterior.

This selective saturation procedure allows designers to create a black-and-white preview of a design in seconds, or a full-color prototype in minutes. That means they could try out dozens of designs in a single work session, a previously unattainable feat. “You can actually have a physical prototype to see if your design really works,” says Wessely. “You can see how it looks when sunlight shines on it or when shadows are cast. It’s not enough just to do this on a computer.”

That speed also means ChromoUpdate could be used for providing real-time notifications without relying on screens. “One example is your coffee mug,” says Wessely. “You put your mug in our projector system and program it to show your daily schedule. And it updates itself directly when a new meeting comes in for that day, or it shows you the weather forecast.”

Wessely hopes to keep improving the technology. At present, the light-activated ink is specialized for smooth, rigid surfaces like mugs, phone cases, or cars. But the researchers are working toward flexible, programmable textiles. “We’re looking at methods to dye fabrics and potentially use light-emitting fibers,” says Wessely. “So, we could have clothing — t-shirts and shoes and all that stuff — that can reprogram itself.”

The researchers have partnered with a group of textile makers in Paris to see how ChomoUpdate can be incorporated into the design process.

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This research was funded, in part, by Ford.

Written by Daniel Ackerman, MIT News Office

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Abby Abazorius
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@MIT

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Graphene key for novel hardware security

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A team of Penn State researchers has developed a new hardware security device that takes advantage of microstructure variations to generate secure keys. CREDIT
Jennifer McCann,Penn State
A team of Penn State researchers has developed a new hardware security device that takes advantage of microstructure variations to generate secure keys. CREDIT
Jennifer McCann,Penn State

Abstract:
As more private data is stored and shared digitally, researchers are exploring new ways to protect data against attacks from bad actors. Current silicon technology exploits microscopic differences between computing components to create secure keys, but artificial intelligence (AI) techniques can be used to predict these keys and gain access to data. Now, Penn State researchers have designed a way to make the encrypted keys harder to crack.

Graphene key for novel hardware security


University Park, PA | Posted on May 10th, 2021

Led by Saptarshi Das, assistant professor of engineering science and mechanics, the researchers used graphene — a layer of carbon one atom thick — to develop a novel low-power, scalable, reconfigurable hardware security device with significant resilience to AI attacks. They published their findings in Nature Electronics today (May 10).

“There has been more and more breaching of private data recently,” Das said. “We developed a new hardware security device that could eventually be implemented to protect these data across industries and sectors.”

The device, called a physically unclonable function (PUF), is the first demonstration of a graphene-based PUF, according to the researchers. The physical and electrical properties of graphene, as well as the fabrication process, make the novel PUF more energy-efficient, scalable, and secure against AI attacks that pose a threat to silicon PUFs.

The team first fabricated nearly 2,000 identical graphene transistors, which switch current on and off in a circuit. Despite their structural similarity, the transistors’ electrical conductivity varied due to the inherent randomness arising from the production process. While such variation is typically a drawback for electronic devices, it’s a desirable quality for a PUF not shared by silicon-based devices.

After the graphene transistors were implemented into PUFs, the researchers modeled their characteristics to create a simulation of 64 million graphene-based PUFs. To test the PUFs’ security, Das and his team used machine learning, a method that allows AI to study a system and find new patterns. The researchers trained the AI with the graphene PUF simulation data, testing to see if the AI could use this training to make predictions about the encrypted data and reveal system insecurities.

“Neural networks are very good at developing a model from a huge amount of data, even if humans are unable to,” Das said. “We found that AI could not develop a model, and it was not possible for the encryption process to be learned.”

This resistance to machine learning attacks makes the PUF more secure because potential hackers could not use breached data to reverse engineer a device for future exploitation, Das said. Even if the key could be predicted, the graphene PUF could generate a new key through a reconfiguration process requiring no additional hardware or replacement of components.

“Normally, once a system’s security has been compromised, it is permanently compromised,” said Akhil Dodda, an engineering science and mechanics graduate student conducting research under Das’s mentorship. “We developed a scheme where such a compromised system could be reconfigured and used again, adding tamper resistance as another security feature.”

With these features, as well as the capacity to operate across a wide range of temperatures, the graphene-based PUF could be used in a variety of applications. Further research can open pathways for its use in flexible and printable electronics, household devices and more.

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Paper co-authors include Dodda, Shiva Subbulakshmi Radhakrishnan, Thomas Schranghamer and Drew Buzzell from Penn State; and Parijat Sengupta from Purdue University. Das is also affiliated with the Penn State Department of Materials Science and Engineering and the Materials Research Institute.

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180 Degree Capital Corp. Reports +14.2% Growth in Q1 2021, $10.60 Net Asset Value Per Share as of March 31, 2021, and Developments From Q2 2021

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Home > Press > 180 Degree Capital Corp. Reports +14.2% Growth in Q1 2021, $10.60 Net Asset Value Per Share as of March 31, 2021, and Developments From Q2 2021

Abstract:
180 Degree Capital Corp. (NASDAQ:TURN) (“180” and the “Company”), today reported its financial results as of March 31, 2021, and additional developments from the second quarter of 2021. The Company also published a letter to shareholders that can be viewed at https://ir.180degreecapital.com/financial-results .

180 Degree Capital Corp. Reports +14.2% Growth in Q1 2021, $10.60 Net Asset Value Per Share as of March 31, 2021, and Developments From Q2 2021


Montclair, NJ | Posted on May 11th, 2021

“I am pleased to report continued growth in our net asset value per share (NAV) as of March 31, 2021, to $10.60, the highest level in over six years,” said Kevin M. Rendino, Chief Executive Officer of 180. “This growth was powered by our continued strong performance in our public market investment strategy that generated a gross total return of +28.3% in the first quarter of 2021.1 Our separately managed account (SMA) had strong performance as well, generating a gross total return of +20.7%. If this were the end of 2021, we would generate approximately $2 million in carried interest from the SMA, and net performance for the SMA would be 14.5%.2 I remind investors that this potential carried interest is not included in our reported NAV as of the end of the first quarter of 2021. We ended the quarter with approximately $114 million in assets under management in aggregate in 180 and our SMA, available to be deployed in our public market investment strategy. I am proud of this 5.5x increase in scale we have built at 180 since starting in 2017. We continue to believe our Graham and Dodd investment philosophy, coupled with our activist approach, will lead to enhanced shareholder value creation for all of our TURN shareholders.”

“Q2 2021 has started off positive for 180 and our SMA,” added Daniel B. Wolfe, President of 180. As of May 10, 2021, 180’s cash3 and securities of publicly traded companies increased to approximately $77.0 million, or $7.42 per share, and our SMA increased to approximately $41.5 million in asset value. These increases bring our current assets to be deployed in our public market investment strategy to approximately $118.5 million. We remind investors that it remains too early to know where 180’s NAV and the net assets of our SMA will end up as of the end of Q2 2021 or the end of 2021.”

The table below summarizes 180’s performance over periods of time through the end of Q1 2021:

Quarter 1 Year 3 Year Inception to Date
Q1 2021 Q1 2020-Q1 2021 Q1 2018-Q1 2021 Q4 2016-Q1 2021
TURN Public Portfolio Gross Total Return (Excluding SMA Carried Interest) 28.3% 110.0% 169.7% 351.2%
TURN Public Portfolio Gross Total Return (Including SMA Carried Interest) 31.8%3 124.5% 188.3% 382.3%

Change in NAV 14.2% 66.7% 33.8% 51.0%

Change in Stock Price 11.1% 81.6% 32.6% 78.7%

Russell Microcap Index 23.9% 120.3% 58.2% 80.5%
Russell Microcap Value Index 30.7% 120.5% 49.9% 68.2%
Russell 2000 12.7% 94.8% 51.0% 73.0%
Mr. Rendino and Mr. Wolfe will host a conference call tomorrow, Wednesday, May 12, 2021, at 9am Eastern Time, to discuss the results from Q1 2021 and the developments during Q2 2021. The call can be accessed by phone at (712) 770-4598 passcode 415049 or via the web at https://www.freeconferencecall.com/wall/180degreecapital. Additionally, slides that will be referred to during the presentation can be found on 180’s investor relations website at https://ir.180degreecapital.com/ir-calendar.

####

About 180 Degree Capital Corp.
180 Degree Capital Corp. is a publicly traded registered closed-end fund focused on investing in and providing value-added assistance through constructive activism to what we believe are substantially undervalued small, publicly traded companies that have potential for significant turnarounds. Our goal is that the result of our constructive activism leads to a reversal in direction for the share price of these investee companies, i.e., a 180-degree turn. Detailed information about 180 and its holdings can be found on its website at www.180degreecapital.com.

This press release may contain statements of a forward-looking nature relating to future events. These forward-looking statements are subject to the inherent uncertainties in predicting future results and conditions. These statements reflect the Company’s current beliefs, and a number of important factors could cause actual results to differ materially from those expressed in this press release. Please see the Company’s securities filings filed with the Securities and Exchange Commission for a more detailed discussion of the risks and uncertainties associated with the Company’s business and other significant factors that could affect the Company’s actual results. Except as otherwise required by Federal securities laws, the Company undertakes no obligation to update or revise these forward-looking statements to reflect new events or uncertainties. The reference and link to the website www.180degreecapital.com has been provided as a convenience, and the information contained on such website is not incorporated by reference into this press release. 180 is not responsible for the contents of third-party websites.

1 Past performance is not an indication or guarantee of future performance. Gross unrealized and realized total returns of 180’s cash and securities of publicly traded companies are compounded on a quarterly basis, and intra-quarter cash flows from investments in or proceeds received from privately held investments are treated as inflows or outflows of cash available to invest or withdrawn, respectively, for the purposes of this calculation. 180 is an internally managed registered closed-end fund that has a substantial portion of its assets in legacy privately held companies that are fair valued on a quarterly basis by the Valuation Committee of its Board of Directors. 180 is an internally managed registered closed end fund and does not have an external manager that is paid fees based on assets and/or returns. Please see 180’s filings with the SEC, including its 2020 Annual Report filed on Form N-CSR for information on its expenses and expense ratios.
2 Carried interest is due from the separately managed account based on annual performance and is not accrued until end-of-year performance is determined or is otherwise payable. Actual carried interest at the end of 2021 may be materially different.
3 Cash, net of unsettled trades.

For more information, please click here

Contacts:
Press Contact:
Daniel B. Wolfe
180 Degree Capital Corp.
973-746-4500

Copyright © 180 Degree Capital Corp.

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