More Secure Optical Communications Via Antisqueezed Light

first_img Explore further Citation: More Secure Optical Communications Via ‘Antisqueezed’ Light (2006, October 10) retrieved 18 August 2019 from https://phys.org/news/2006-10-optical-antisqueezed.html Physicists use nanostructures to free photons for highly efficient white OLEDs Enter researchers Tatsuya Tomaru and Masashi Ban from the Hitachi Advanced Research Laboratory in Japan. Recently, they figured out that more secure optical communications can be achieved using “antisqueezed” light. Their work is described in the September 13, 2006, online edition of Physical Review A.“Antisqueezed light is tolerant of loss and amplification,” Tomaru told PhysOrg.com. “It is well suited to optical communication.”Antisqueezing, rather nonintuitively, is one side effect of a process called squeezing, which (also nonintuitively) is not the mechanical action its name implies. Rather, understanding squeezing and antisqueezing begins by understanding the quantum nature of light – that light is inherently grainy, made up of basic units, or “quanta,” called photons. And photons, like other particles, like to retain some mystery. A photon will allow either its position or its momentum to be measured with high precision – but not both. This limitation is known as the Heisenberg Uncertainty Principle.That said, squeezed light – and by extension antisqueezed light – is defined by fluctuations in the precision of the photons’ measured position and momentum. When the fluctuation (i.e. the error) of the measured momentum is “squeezed,” the fluctuation of the measured position must, in accordance with the Heisenberg Uncertainty Principle, become inflated, or “antisqueezed.”So how can this make optical communications more secure? Mathematically speaking, when squeezed light is transmitted, the larger fluctuation – the antisqueezed component – dominates, and the squeezed component regresses to the natural fluctuations light experiences in a vacuum. But the antisqueezed component resists that pull; it is always beyond the vacuum fluctuation, even after loss and amplification. The result is a signal that is far more loss-tolerant. As a result, there are far fewer lost pieces for eavesdroppers to collect.Tomaru and Ban assume real light signals that are encrypted prior to transmission, with the intended receiver equipped with the proper key to correctly un-encrypt the signal. An eavesdropping receiver would not know this key, and would be unlikely to correctly guess it. This is a common way to secure a transmission. Using antisqueezed light adds an extra measure of security.“Antisqueezing is essential to differentiating between legitimate receivers and eavesdroppers,” said Tomaru. “Eavesdropping would be very difficult under these conditions.”Citation: T. Tomaru and M. Ban, “Secure optical communication using antisqueezing.” Phys. Rev. A 74, 032312 (2006)By Laura Mgrdichian, Copyright 2006 PhysOrg.comcenter_img Using light to transmit information – optical communication – is the basis of several technologies, most commonly fiber-optic cables, which are used in imaging and telecommunications. But sending information securely using light requires minimizing and compensating for loss as the light propagates between transmitter and receiver. And in the area of security, there is always room for improvement. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Fujifilms FinePix Real 3D W3 digital camera lets user capture images in

first_imgWith built-in lenses, image sensors for capturing 3D images, Fuji stands apart from its competition by processing 3D in hardware while most, like Sony, perform post-processing in software. With a list price of $500, like most professional picture-taking 2D cameras, the FinePix Real 3D W3 will launch in early September 2010, alongside new Sony models. Fujifilm unveils 3D digital camera Citation: Fujifilm’s FinePix Real 3D W3 digital camera lets user capture images in 3D (2010, August 23) retrieved 18 August 2019 from https://phys.org/news/2010-08-fujifilm-finepix-real-3d-w3.html Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. After a successful launch of the worlds first 3D camera in September of ’09, the makers of Fujifilm developed a smaller, lighter, more compact version, weighing only 8.5 ounces with battery. The FinePix Real 3D W3 digital camera has a Minin HDMI 1.4 interface for immediate 3D viewing of pictures and videos taken at resolutions as high as 720p on practically any 3D TV with stereographic glasses, or special laptops and PC desk monitors. Among some of the other added benefits of the new version are an improved screen, 3x optical zoom, and Auto 3D mode.On the flip side, by using the 3.5 inch LCD display, or the optional 3D viewer, special glasses aren’t needed at all to view images. There’s also an added option to transform the images in lenticular prints through a unique printing process, that will be available in the UK. (c) 2010 PhysOrg.com (PhysOrg.com) — With 3D HDTV’s exploding in today’s market, Fujifilm has launched a new point-and-click camera with 3D photo capability. With 3D TV innovators like Sony, Panasonic and Samsung, the camera comes at a time perfect for the 3D revolution and can be used with or without special glasses to view. President for Fujifilm North American Imaging and Electronics Divisions, Go Myazaki, spoke of affordable 3D TV’s on the rise, during a press event Tuesday at the Museum of Natural History saying “we’re looking to leverage that.” Moving beyond the hobbyists, the FinePix Real 3D W3 digital camera is an attempt to increase interest in the mass market. Though, it’s not to be said a second, 2D camera is needed after the purchase of the FinePix Real 3D W3. Two cameras in one, users can switch modes via the built-in button, to shoot and display normal, 2D photos. One special feature, the proprietary processor, allows users to take two pictures at one time. More than a 2D, there’s a lot of creative freedom with this newer version.last_img read more

Two teams independently find that adding vibration helps couple light to graphene

first_img It’s very common and relatively easy to use light or electronics as a means of carrying data—what’s difficult is using both in the same device. The problem is getting photons converted to electrons and vice-versa. Recent research has found that using two dimensional graphene as a means for doing so might be feasible, but up until now, scientists have only been able to achieve efficiencies of approximately 2 percent. In this new effort, both teams were able to increase the efficiency to 50 percent by causing the graphene surface to vibrate in a tunable way as it was being hit with light.Graphene is used because of its unique honeycomb structure that allows for long duration plasmons—quasi-particles which have an oscillation property—that can be tuned to desired frequencies. Current methods of coupling that rely on shaping the graphene into ribbons have been found to be highly inefficient due to scattering at the edges (and that the approach does not allow for tuning patterns.)To reduce scattering, both teams applied a vibrating force to the graphene sheet. The Saudi team attached an actuator—the Spanish team added piezoelectric material as a base to the graphene. Both resulted in the same outcome, namely, causing the electrons in the surface of the graphene to vibrate as they were being struck by photons—tuning the vibrations allowed for rousing the conduction electrons into plasmons, which thereafter could be processed by electronic components.The results by both teams are just the first step in creating mechanisms that are able to join electronic functions with photons which may one day lead to devices such as exotic super-sensitive chemical detectors, new kinds of photovoltaic cells or general purpose nano-optoelectronics devices. Citation: Two teams independently find that adding vibration helps couple light to graphene (2013, December 12) retrieved 18 August 2019 from https://phys.org/news/2013-12-teams-independently-adding-vibration-couple.html (Phys.org) —Two teams of researchers, one working in Saudi Arabia, the other in Spain, have discovered independently that adding vibrations to a graphene surface allows for more efficient conversion of photons to plasmons. In their papers, both published in the journal Physical Review Letters, each team describes how they found that causing a two-dimensional graphene surface to vibrate (using two different methods) led to a huge increase in light energy being coupled. Journal information: Physical Review Letters © 2013 Phys.org Explore furthercenter_img More information: Exciting Graphene Surface Plasmon Polaritons through Light and Sound Interplay, Phys. Rev. Lett. 111, 237404 (2013) prl.aps.org/abstract/PRL/v111/i23/e237404Coupling Light into Graphene Plasmons through Surface Acoustic Waves, Phys. Rev. Lett. 111, 237405 (2013) prl.aps.org/abstract/PRL/v111/i23/e237405 Credit: J. Schiefele et al., Phys. Rev. Lett. (2013) This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. ‘Tense’ graphene joins forces with gold nano-antennaslast_img read more

Sabertoothed cat fossils provide evidence of canines able to puncture a skull

first_imgDetail of the injury of Smilodon populator specimen MCA 2046. B. Detail showing the canine of another Smilodon specimen inserted through the opened injury. C. Detail of the injury of specimen MRFA-PV-0564. Not to scale. Credit: Comptes Rendus Palevol (2019). DOI: 10.1016/j.crpv.2019.02.006 Explore further More information: Nicolás R. Chimento et al. Evidence of intraspecific agonistic interactions in Smilodon populator (Carnivora, Felidae), Comptes Rendus Palevol (2019). DOI: 10.1016/j.crpv.2019.02.006 A team of researchers with members affiliated with several institutions in Argentina has found evidence that suggests the canine teeth of the saber-toothed cat were strong enough to puncture the skulls of other members of the same species. In their paper published in the journal Comptes Rendus Palevol, the group describes their study of saber-toothed cat fossils and what they learned from them. Saber-toothed kittens may have been born with thicker bones than other contemporary cats The saber-toothed cat was a formidable predator, of that there is little doubt—the species living in South America, Smilodon populator, grew to weigh 220 to 400 kg, was approximately 120 centimeters long, and had canine teeth that grew to be 28 centimeters in length. They lived during the Late Pleistocene Epoch (from 11,000 to 126,000 years ago). Paleontologists have believed that the canines of the big cats were too thin to puncture bone, but now that theory appears to be under fire. The researchers with this new effort report evidence of what appears to be a hole in an S. populator skull that was made by the canine of another S. populator.The researchers report that they have actually found two S. populator skull fossils with holes in them consistent with a canine piercing. Both of the skulls were found in different parts of what is now Argentina, and both had a single hole between the eyes, but a little farther back—very similar to hole punctures in many modern cats (cheetahs, leopards and jaguars)—such cats, especially males, often get into serious fights, sometimes resulting in the death of one of the combatants. The researchers found that an S. populator canine fit perfectly into the hole in the skull. They tried the same test with other long-toothed animals and were not able to find any with teeth that fit into the holes. They even checked to see if the holes could have been made by a kick from a hoofed animal and were not able to find any that matched. The only fit was another saber-toothed cat canine, which suggests that the holes were made as the cats were fighting over territory, food or a potential mating partner. © 2019 Science X Network Citation: Saber-toothed cat fossils provide evidence of canines able to puncture a skull (2019, June 3) retrieved 18 August 2019 from https://phys.org/news/2019-06-saber-toothed-cat-fossils-evidence-canines.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

Childrens day out

first_imgDastkar Fun Fest promises a vibrant mix of kids-focused entertainment, cultural performances, fun and food for all the family and a range of interactive workshops in traditional crafts, fun activities and recycling.Craftgroups from across India, social development NGOs and innovative design entrepreneurs working in hand-crafted items will offer special ranges of children’s garments, kid-themed decorative, toys, games and children’s books, as well as a wide selection of festive gift items, natural products and plants. Workshops will range from pottery and folk-art painting to making recycled newspaper items and themed play kits. Magic, movies, story-telling, puppet shows and participative music sessions will be some of the many attractive features at Dastakar Fun Fest –  a dynamic, vibrant and fun day out for all the family!Dastkar, a national NGO working with crafts and craftspeople for over three decades, strongly believes in crafts as catalytic tool for social and economic empowerment and earning. Partnering with Delhi Tourism, it is developing the Nature Bazaar venue in Andheria Modh as a craft and cultural hub, linking South Delhi and Gurgaon.When: 20 December 11:00 am onwardsWhere: Kisan Haat, Andheria Modhlast_img read more

Deepika was always a star Shahrukh

first_imgShah Rukh Khan, the producer and hero of Deepika Padukone’s debut film Om Shanti Om, says she has paved the way for her own success and that she always had it in her to be a ‘star’.SRK and Deepika worked under Farah Khan’s direction for Om Shanti Om, and the team has joined hands again for the forthcoming Happy New Year. In the gap of seven years, Deepika has established herself as one of the reigning beauties in Bollywood — and Shah Rukh feels the success is ‘all hers’. Also Read – A fresh blend of fame‘I have nothing to do with her (Deepika’s) success. It’s all hers. You can’t take credit away from someone,’ Shah Rukh told reporters in a group interview.Citing his own example, he said that when he worked on his debut film Deewana, veteran actors like Rishi Kapoor and Amrish Puri were very nice and kind to him.‘I must have made mistakes, I must have been good and bad,’ Shah Rukh said as he mulled over his own journey.But then talking of Deepika, he said: ‘I think Deepika was always a star. Since she was new, we did the Aankhon mein teri song and we showed it to Amitji (Amitabh Bachchan). He said, ‘She is a very huge star’. She was a supermodel at that time, so it’s not something we (Farah and I) have done.‘I haven’t worked with her for seven years, but I think she has it all. As a friend, I told her that ‘Always do a film where you feel comfortable with the people around’. She has made wonderful choices — whether it’s Cocktail or Finding Fanny. ‘She has chosen some highly commercial films too; she has made the right choices,’ he said.last_img read more

Briton Krishna Maharaj framed by Columbian drug lord

first_imgKrishna Maharaj, a self-made millionaire who moved to Florida in the mid-1980s, spent 15 years on death row for the killing of his business partner Derrick Moo Young, of Jamaican-Asian descent, and his son Duane before his sentence was appealed and commuted to two life sentences in 1997. He has always maintained he is innocent. The 75-year-old’s lawyer Clive Stafford Smith, of human rights organisation Reprieve, says evidence suggests the execution style murders at a downtown Miami hotel in 1986 were ordered by Escobar, the former head of the infamous Medellin cartel. His defence team are now hoping new evidence at the three-day hearing will be enough to persuade Florida circuit court judge William Thomas to overturn Maharaj’s conviction. Also Read – Pro-Govt supporters rally as Hong Kong’s divisions deepenA former American pilot who flew cocaine shipments for the cartel told the court on Monday that during a conversation with Escobar at his Colombian ranch in 1986 he heard the drug lord admit to having killed ‘los chinos’ (the Chinese) at a downtown Miami hotel. Maharaj had gone to the hotel that day and waited in room 1215 for a business associate who, he says, never turned up. His legal team claims Maharaj was lured there to leave his fingerprints at the scene, and left before the Youngs arrived. Stafford Smith claims Maharaj, who was suing Young for fraud at the time, was framed to cover up Colombian cartel murders.  Also Read – Pak Army ‘fully prepared’ to face any challenge: Army spokesmanBut prosecutors claimed he lay in wait for Young, 53, and his son Duane, 23, confronted them about missing cash – then shot them both dead. Maharaj was arrested while eating dinner at a Miami restaurant later that evening with his wife, Marita. A retired DEA agent, Henry Cuervo, also testified that the initial 1986 investigation by Miami police ignored ‘red flags’ pointing to the involvement of Colombian drug traffickers, including documents that indicated the Moo Youngs were involved in money laundering. Brenton Ver Ploeg, a lawyer who investigated a $1.5 million life insurance policy held by the  Youngs, told the court that financial records suggested the family company was involved in illegal activities including drug money laundering. He said he stored the documents in the case for 28 years because he felt there was ‘something wrong’ with the case, and was surprised that investigators never asked to see his files until years later. Prosecutors sought to block Monday’s testimony saying the defense case consisted of hearsay.last_img read more

Irresistible emotions World Cup fever come to Darjeeling

first_imgDarjeeling: It was Asha’s first ever tryst with Darjeeling that she had heard about from her father and grandfather, not quite the one that she was born and brought up in. Asha, a Class 9 student of a Hill school, was used to a Darjeeling where rallies, slogan shouting and bandhs were a daily affair. The days of unrest usually paved way for agitations marred with violence. But today, the scenario is very different. On Saturday, thousands of students along with people from all walks of life, took to the street with flags and cheered, sang and danced to celebrate the spirit of Darjeeling and the teams they support for the upcoming football World Cup. The frenzy gripped the Queen of Hills that was labeled as Darjeeling — the World Cup Town 2018 by the citizens. Also Read – Heavy rain hits traffic, flightsThough the world will ring in the football World Cup on June 14, Darjeeling kick started the frenzy on June 2 with a mega event organised by Darjeeling North Point School Alumni Association (DNPSAA,) along with various other organisations, NGOs and citizens of the region.”We are celebrating the spirit of Darjeeling along with our love for the game. We want people to know that Darjeeling is peaceful and the nicest place in the world. We want people from all over the world to visit Darjeeling,” stated Ajoy Edwards, Vice-President, DNPSAA. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedVeteran footballers, students from different Hill schools, locals and even tourists joined in the parade that went around Chowrasta and down Nehru Road to return to where it began. The marchers shouted slogans and danced to football-themed songs. The parade was led by footballer Nirmal Chettri of FC Goa.The town was decorated with separate team flags, roadside walls painted up and billboards put up giving the town which is witnessing a huge tourist onrush, a festive look. The day saw cheer-leading competitions, garage sales by Shanker Foundation; dance fiesta by Edith Wilkins Street Children’s Trust; bike and scooty rallies from Kurseong hosted by MARG; mountain bike rally; BMX stunts; cosplay, b-boying; face painting; nail art; hair do; musical performances and beat boxing. The bike rally from Darjeeling to Kurseong and back was a major attraction. Even women riding scootys, mountain bicycles were part of it. Aces — the Super Bike club from Siliguri also joined them. “I had heard from my father and grandfather that Darjeeling used to be the safest, most peaceful and cosmopolitan place in the country. It was a great place to live in. In the past, I had never seen anything to connect the town with such claims. However, today (Saturday) was different. Hope we get back all the goodness of good old Darjeeling soon,” said Asha. The award for the cheer leading competition was won by Gyanodaya Niketan School, Darjeeling. An award for best decorated area of the town (World Cup theme) was also announced. 10-year-old Pratham Thapa, an MTB rider, was also felicitated. “The event is not just about fun. It has an underlying cause. With the participation registration amount we will buy an ambulance for our project the Clinic on Wheels. This is an ambulance fitted with a mobile lab and ECG machine. The mobile clinic will visit far flung areas every week and provide medical test facilities to the marginalized at highly subsidized costs,” stated Deven Gurung, president, DNPSAA. The organisers also want to revive the golden era of football in the Hills including the famous Brigade of Gurkhas Gold Cup football tournaments.”Even back home celebrations have not yet commenced. Darjeeling has beaten us. I’m happy to see that England too has quite a fan following in Darjeeling,” stated Neil, a tourist from England.last_img read more

Monsoon to hit North Bengal in 3 days

first_imgKolkata: The Monsoon is all set to hit North Bengal within the next three days but for the South Bengal districts, it might take some more time. There may be some pre-monsoon rains in the South Bengal districts including Kolkata. Various South Bengal districts received moderate to heavy rainfall on Monday morning disrupting normal life. According to the Regional Meteorological Centre at Alipore, South Bengal districts including the city may witness thunderstorms as a result of pre-Monsoon rains within the next 48 hours before the advent of Monsoon in the state. Also Read – Heavy rain hits traffic, flightsAccording to a senior official of the weather office, a circulation which was staying over Bangladesh could trigger a storm in some parts of North Bengal. A favourable atmosphere for rain has already been prevailing in the Himalayan regions. Various South Bengal districts including North 24-Parganas, Nadia, Murshidabad, Hooghly, Howrah and parts of the city received moderate to heavy rainfall on Monday morning. “Local clouds have started forming due to the impact of approaching Monsoon. It will trigger mild thunderstorms mainly in the North Bengal districts. However, there is hardly any possibility of squall in the city and the South Bengal districts. Cloud masses which have been floating in from the neighbouring areas for the past few days are not potent enough to initiate a squall in the Southern parts,” a senior official of the weather office said. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedIt may be mentioned here that Monsoon currents have already reached Tripura and parts of central Assam and Bangladesh. The currents have started advancing towards North Bengal. It is expected that Monsoon currents will arrive in North Bengal by the middle of this week.However, it is difficult to predict the date of the arrival of Monsoon in South Bengal and Kolkata as there is no clear indication to the weather office. This is because there is no low-pressure or any cyclonic circulation over the Bay of Bengal. The Monsoon is not likely to hit this week as there is no such system prevailing over the Bay of Bengal.last_img read more

New bus taxi fare to be effective from June 11

first_imgKolkata: The West Bengal government today announced the increased fare chart of public transport system in the state which will be effective from June 11. A Transport department notification said, the existing fares of non-AC stage carriages run by private operators and state transport undertakings shall be effective from June 11. As per the new fare chart, the minimum fare for ordinary bus services will be Rs 7 up to 4 km, followed by Rs 9 for a distance of 4-12 km, Rs 10 for 12-16 km, Rs 11 for 16-20 km. Also Read – Heavy rain hits traffic, flights For 20-24 km the new fare will be Rs 12 for ordinary bus services. For mini bus and special buses, the increased fare will be Rs 8 up to 3 km, Rs 9 from 3-6 km, Rs 10 from 6-10 km and Rs 11 from 10-16 km, the notification said. According to the notification, the minimum taxi fare has been fixed at Rs 30 from Rs 25 earlier. For every additional 0.2 km (200 metres), the taxi fare will be increased by Rs 3. For AC taxis, the proposed rates will be an additional 25 per cent on all the rates proposed for ordinary metered taxis. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killed For Tramways, fare has been fixed at Rs 6 for a distance up to 4 km and Rs 7 beyond 4 km. Fare charts have also been announced for the districts, intra-state express bus services and inter-state express bus services and inland waterways. Earlier on June six Transport Minister Suvendu Adhikari announced the decision to hike the bus fare by Rs one in every stage and put the onus on Centre for “causing the additional burden on common people by increasing the price of petrol and diesel.” This is the first time that the bus fares in the state is being increased after 2014. At present, a passenger has to pay Rs 6 for the first stage of four km in an ordinary bus, while travelling in a mini-bus cost Rs 7 for the first two km.last_img read more