Connect with us

Computers & Math

“Revolutionizing Quantum Communication: Nanophotonic Platform Boosts Efficiency of Nonlinear-Optical Quantum Teleportation”

Researchers have long recognized that quantum communication systems would transmit quantum information more faithfully and be impervious to certain forms of error if nonlinear optical processes were used. However, past efforts at incorporating such processes could not operate with the extremely low light levels required for quantum communication.

Avatar photo

Published

on

The scientists have been working on incorporating nonlinear optical processes into quantum communication systems for a long time. These processes can transmit quantum information more faithfully and be impervious to certain forms of error. However, past efforts at using such processes were hindered by their inability to operate with the extremely low light levels required for quantum communication.

A team at the University of Illinois Urbana-Champaign has now improved this technology by basing the nonlinear process on an indium-gallium-phosphide nanophotonic platform. The result is substantially more efficient than prior systems, requiring much less light and operating all the way down to single photons, the smallest unit of light.

The researchers’ achievement demonstrates the power of quantum communication with nonlinear optics. Their system transmits quantum information with 94% fidelity compared to the theoretical limit of 33% on systems using linear optical components. This means that their technology is promising, and it has the potential to be used in other areas of quantum communications.

Transmission of quantum information over networks is facilitated by the quantum teleportation protocol. In this process, the phenomenon of quantum entanglement is exploited to transfer quantum information between a sender and a receiver without transmitting it through a communication channel. The advantage of this procedure is that the influences of external noise and channel imperfections are greatly mitigated.

However, there are two factors which limit the performance of quantum teleportation. First, the use of standard, linear optical components introduces inherent ambiguities in the transmission. Second, the entangled photons are made with an imperfect process subject to errors and excess noise. In particular, it is common for entanglement sources to produce more than a single pair of photons at once, making it unclear whether the two used in teleportation are truly entangled.

The researchers have now found a solution to this problem by using nonlinear optical components. These cause photons of different frequencies to combine and create new photons at new frequencies. For quantum teleportation, the nonlinear process used is “sum frequency generation” (SFG), in which the frequencies of two photons add to form a new photon.

When SFG is used in quantum teleportation, the protocol does not proceed if two photons of the same frequency are detected. This filters out the primary type of noise in most entangled photon sources and allows for much higher teleportation fidelities than would be possible otherwise. However, the main drawback is that an SFG conversion occurs with very low probability, making the teleportation process highly inefficient.

The researchers have now overcome this challenge by using a nanophotonic platform, which has increased the efficiency of the nonlinear optical components. They achieved a factor of 10,000 increase in conversion efficiency to 1 in 10,000. This breakthrough has the potential to revolutionize quantum communication and make it more efficient.

The researchers are optimistic that their technology will be used in other areas of quantum communications, including entanglement swapping. With further development, they believe that quantum teleportation with nonlinear optical components can be made even more efficient.

Communications

Tailoring Social Media to Fit Your Needs: A New Approach to Making Online Time More Fulfilling

Redesigning social media to suit different needs of users could make their time online more focused, according to new research.

Avatar photo

Published

on

By

The study, conducted by University of Bristol academics, has shed light on the importance of tailoring social media to suit individual needs. By categorizing users into distinct groups based on their motivations and behaviors, researchers have found that finding the right level of personal investment is key to a positive experience online.

The research revealed three main user types:

1. Those who browse without strong intentionality, often mindlessly scrolling through feeds.
2. Those deeply invested in their online lives, potentially leading to compulsive use and negative consequences for well-being.
3. Those who see value in using social media but retain personal distance, arguably having the best outcomes overall.

The findings suggest that social media platforms could be redesigned to support more intentional use by introducing customized features tailored to different user needs. This approach has the potential to help users regain control over their time online and make it more purposeful and valued.

By adapting interfaces to align with individual well-being, social media platforms can promote sustainable engagement connected to things that matter to the user, rather than just maximizing screen time. The implications of this work extend beyond social media design into technology use more broadly, offering a data-driven approach to promoting digital self-regulation and overall well-being.

The next phase of this research will explore how social media platforms can identify different user groups and adapt interfaces to support intentional online engagement that prioritizes personal well-being.

Continue Reading

Child Development

Smart Home Surveillance Threatens Domestic Workers’ Safety and Privacy

The growing use of smart home devices is undermining the privacy and safety of domestic workers. New research reveals how surveillance technologies reinforce a sense of constant monitoring and control by domestic workers’ employers, increasing their vulnerability and impacting their mental wellbeing.

Avatar photo

Published

on

By

Smart home technologies are increasingly used worldwide to monitor and control various aspects of daily life. However, a growing concern has emerged regarding the impact of these devices on domestic workers, who often find themselves under constant surveillance.

Researchers from King’s College London have conducted a study that reveals the unsettling truth about smart home devices being used to monitor domestic workers in China. The study, which involved interviews with 26 domestic workers and five recruitment agencies, highlights how employers are using these technologies to exert control over their employees, undermining their privacy and safety.

The researchers found that many domestic workers felt like they were under constant observation, with cameras and sensors installed in every room of the smart home. Some reported not being informed about the presence of cameras, while others discovered them hidden in bookshelves or disguised as other devices.

The constant feeling of being watched had a profound impact on the mental wellbeing of these domestic workers. Many felt uneasy, anxious, and even trapped in their own homes. The researchers concluded that this level of surveillance amounts to mental abuse, undermining trust and affecting workplace interactions.

Furthermore, the study revealed how smart home technologies exacerbate existing power imbalances between workers and employers. Employers can use these devices to monitor workers’ performance, track their movements, and even make decisions about their employment based on data collected from the devices.

The researchers highlighted that while many domestic workers recognized the need for safety, especially when caring for babies, the absence of clear communication from employers about the purpose of monitoring sparked distrust and discomfort. They recommended that domestic worker agencies integrate privacy education into training programmes for workers to understand their rights and establish transparent communication and contractual agreements regarding surveillance practices.

The study was conducted by researchers from King’s College London, along with collaborators from the University of St Andrews and the China Academy of Art, Hangzhou. The findings suggest that this issue is not unique to China but may be affecting migrant domestic workers worldwide.

In conclusion, the use of smart home technologies to monitor domestic workers raises significant concerns about their safety and privacy. The researchers’ recommendations provide a starting point for policymakers and agencies to address these challenges and ensure that domestic workers are protected from exploitation. As technology continues to advance, it is crucial that we prioritize human rights and dignity in the development and implementation of smart home devices.

Continue Reading

Artificial Intelligence

“Revolutionizing Hospital Disinfection: Autonomous Robots for Efficient Sanitation”

A research team develops disinfection robot combining physical wiping and UV-C sterilization.

Avatar photo

Published

on

The COVID-19 pandemic has brought to the forefront the critical importance of thorough disinfection, particularly within hospital environments. However, traditional manual disinfection methods have inherent limitations, including labor shortages due to physical fatigue and risk of exposure to pathogens, inconsistent human performance, and difficulty in reaching obscured or hard-to-reach areas.

To address these challenges, a team of researchers from Pohang University of Science and Technology (POSTECH) has developed an “Intelligent Autonomous Wiping and UV-C Disinfection Robot” that can automate hospital disinfection processes. This innovative robot is capable of navigating through hospital environments and performing disinfection tasks with precision and consistency.

The key feature of this robot is its dual disinfection system, which combines physical wiping and UV-C irradiation to effectively remove contaminants from surfaces. The robotic manipulator uses a wiping mechanism to physically clean high-touch areas, while the UV-C light ensures thorough disinfection of hard-to-reach corners and narrow spaces.

Real-world testing at Pohang St. Mary’s Hospital validated the robot’s performance, with bacterial culture experiments confirming its effectiveness in disinfecting surfaces. Repeated autonomous operations were carried out to verify its long-term usability in clinical settings.

The significance of this technology lies in its ability to automate time-consuming and repetitive disinfection tasks, allowing healthcare professionals to devote more attention to patient care. Additionally, the robot’s precision control algorithms minimize operational failures, while its integration with a self-sanitizing station and wireless charging system ensures sustained disinfection operations.

Professor Keehoon Kim emphasized that despite COVID-19 transitioning into an endemic phase, it remains essential to prepare for future pandemics by advancing this disinfection robot technology beyond hospitals to public facilities, social infrastructures, and everyday environments to further reduce infection risks. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT).

Continue Reading

Trending