Physicists add amplifier to quantum communication toolbox Practically speaking, single photon detection has not been something pursued very heavily at the wavelengths used for telecommunication signals. Part of the problem is that performance of single photon detectors are rather constrained at such long wavelengths. But, says Robert Thew, a scientist at the University of Geneva, the time is coming when single photon detectors may be needed in telecommunications. Citation: Single photon detectors for telecommunications wavelengths (2008, August 29) retrieved 18 August 2019 from https://phys.org/news/2008-08-photon-detectors-telecommunications-wavelengths.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. “Up until now,” Thew tells PhysOrg.com, “classical communication has not done too badly with the detectors available now. But now they are getting pushed to the limit as optical communications explodes. Single photon detectors are becoming more important.”In order to improve the ability of a single photon detector to work with signals with telecommunications wavelengths (about 1550 nanometers), Thew and his colleagues at the University of Geneva, Zbinden and Gisin, suggest a scheme that involves upconverting these signals using a tunable pump source to a silicon detector. Their work is published in Applied Physics Letters: “Tunable upconversion photon detector.”“Photon detection in general is a key enabling field of research,” Thew explains. “And it is improving all the time. Photon detection is used for quantum cryptography and computing as well as for metrology and telecommunications. Our experiment is one that shows how telecom wavelength photons can be converted into the regime of silicon detectors.”These Silicon detectors, Thew explains, are useful because they offer a high temporal resolution. While experiments have been done showing upconversion of silicon detectors, this Geneva group has added another element: tunability.Usually, upconversion experiments do not feature a simple and practical method of controlling wavelengths. “These systems are dedicated at well-defined wavelengths,” Thew says. “This works well for some things, but sometimes you want to be able to change the wavelength. That is what we are working on.” Of those that do seek for tunability, they can rely on temperature control to change the wavelength or use the nonlinear phase matching scheme with different poling periods. Thew and his peers decided to make a tunable photon detector using laser tuning.“All upconversion schemes rely on mixing two lasers to generate a third with the desired wavelength by a nonlinear process,” Thew explains. “Our practicality comes from the choice of components. The precision comes from the choice of silicon detector. The tunability comes from being able to tune one of these lasers that are initially mixed.” Not only is this detector tunable, but it is also compact and more cost efficient than similar photon detectors. And, as telecommunications continues to advance, this could be a good way to continue the improvements seen in the last few years. “[F]aster communication systems necessarily have to work with lower intensities (fewer photons) and it is here that the single photon detection technologies will be needed,” Thew explains. “This offers practicality and low cost. The idea is that we keep simplicity, but gain the advantage of tuning wavelengths.”“Things are improving all the time in this area of study,” Thew continues. “Having tunable photon detectors would be helpful for many experiments and applications. We are taking advantage of being able to do this with a silicon detector. What we have done offers a huge advantage for this type of approach.”Copyright 2007 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com.
20Dec Michigan Legislature approves Rep. Bellino’s plan to make schools safer Rep. Joe Bellino’s plan to help improve school safety across Michigan won final legislative approval today in the state House, and will soon be considered by the governor.Bellino’s bill will help develop consistent and uniform training for law enforcement personnel related to school safety incidents. It’s part of a package establishing a state commission to help review and upgrade building security, create reporting procedures for incidents in schools, and make the OK2SAY school safety program permanent.“Nothing we do is more important than taking steps to keep our kids safe,” said Bellino, of Monroe. “The bottom line: This plan we’re putting in place creates a framework to make our schools more secure than they are today. It’s a continuous process, and it requires a team approach from everyone in our communities all across the state.”Other pieces of the bipartisan plan include:Establishing a liaison within each school district to report to and work with the state – a necessary step to make sure improved safety practices reach every corner of Michigan and ensure local perspectives are included in the process. Emergency operations plans will be adopted for each school building.Requiring schools to submit incident reports to Michigan State Police. The reports will provide state school safety officials with examples of how incidents and were handled to develop best practices for other Michigan schools to follow.Requiring schools to consult with local law enforcement officials prior to major renovations or new construction projects, with the goal of including building safety features.Removing the expiration date for the OK2SAY program, which allows the confidential reporting of tips on potentially harmful or criminal activity directed at students, school employees or school buildings.The school safety package includes House Bills 5828-29 and 5850-52, along with Senate Bills 882, 982-83 and 990-91. Categories: Bellino News,News
The gold stocks rallied into positive territory shortly after 10:00 a.m. in New York…but that didn’t last long, or wasn’t allowed to last long…and they quickly got sold down into negative territory…and didn’t do much for the rest of Monday. The HUI closed down 1.18%. The silver stocks stunk up the place again yesterday…and Nick Laird’s Intraday Silver Sentiment Index closed down 1.45%. (Click on image to enlarge) Here are some cute pictures for the day…and the butterfly photo is courtesy of Nick Laird. He photographed it in his back yard on Saturday. What’s going on in the paper world is light years removed from what’s happening in the retail market for bullion. It was a nothing sort of day in gold again on Monday. Volume was very light right up until about 10:30 a.m in New York. But the tiny sell-off that occurred at that time bumped the volume up quite a bit. The low price tick [$1,566.20 spot] came about 11:20 a.m. Eastern time…and from there it recovered a few dollars during the East coast lunch hour, before trading sideways for the rest of the day. Gold closed the Monday trading session at $1,572.70 spot…down $9.60 from Friday’s close. Gross volume was reasonably light…around 122,000 contracts…with a big chunk of that occurring during the late morning sell off in New York. Owned and managed by Eric Sprott, Sprott Money Ltd. is a leading precious metals dealer selling gold and silver coins and bullion bars online and over the phone. For 2 weeks only (April 1 – 14), Sprott Money is having a Spring Sale. All orders over $4,999 will enjoy FREE shipping & insurance! No coupon code required. Since its inception, Sprott Money has prided itself on superior customer relations, providing its clients with only the highest quality bullion products in addition to delivering them discreetly and on time. Don’t miss your chance! Place your order online at www.sprottmoney.com or call us at 1-888-861-0775! “In the sea of financial assets and currencies that are being decimated the world over, the one true safe haven continues to be gold.” – Eric Sprott “Silver is the investment of this decade.” – Eric Sprott Silver spiked up a bit at the New York open on Sunday night, but that wasn’t allowed to last…and the silver price spent virtually the entire trading day oscillating between $27.20 and $27.35 spot. Silver closed at $27.30 spot…down a nickel from Friday’s close. Volume, net of roll-overs out of the May delivery month, was very light at only 22,000 contracts. (Click on image to enlarge) The CME’s Daily Delivery Report showed that 50 gold and 9 silver contracts were posted for delivery within the Comex-approved depositories on Wednesday. In both metals it was “all the usual suspects”. The link to yesterday’s Issuers and Stoppers Report is here. There were no reported changes in GLD or SLV…at least not as of 9:24 p.m. Eastern time yesterday evening. After reporting virtually no sales during most of last week, the U.S. Mint had a very chunky sales report yesterday. They sold 21,500 ounces of gold eagles…2,000 one-ounce 24K gold buffaloes…and 833,000 silver eagles. Over at the Comex-approved depositories on Friday, they reported receiving 798,335 troy ounces of silver…and didn’t ship any out the door. The link to that activity is here. It was another very busy day at the store yesterday…and has been since business began after the Easter long weekend. Our silver sales dominated our gold sales by many thousands of ounces for every ounce of gold we sold yesterday. It was amazing the number of people who had had enough of the banking system and/or the interest rates they were providing…and little had to do with this ‘conspiracy stuff’. Our usual suppliers still aren’t taking orders for one-ounce rounds. Here’s a chart that Nick Laird sent me late on Friday evening that I just didn’t have the space for in Saturday’s column. It’s the Total PMs Pool…and it’s self-explanatory.
— By Justin Spittler, editor, Casey Daily Dispatch It was the strangest raffle I’ve ever seen. Sitting on the table was a giant jar of marijuana. You could pick up the jar. You could inspect it from any angle. You could even smell what was inside. You then wrote how much marijuana you thought was in it. The person with the closest guess would receive the entire jar. It was completely absurd. I’ve never seen anything like it. But that was the scene at the Cannabis Life Conference in Vancouver two weeks ago.• You might be wondering what I’m doing in Canada… After all, it’s a long way from Casey Research’s company headquarters in South Florida. In short, I recently did something I’ve been waiting years to do. I sold all my belongings…packed up a couple suitcases…and hit the road. That’s right. I left Florida to do a worldwide “boots on the ground” tour. I guess you could say I was inspired by Doug Casey. You see, Doug’s the original International Man. He’s been to more than 145 countries. And he’s called more than a dozen “home.” Doug’s travels have helped him better understand the world. They’ve also led him to opportunities that he never would have known about had he stayed put like most people. Now, I’m doing the same. I’m scouring the globe for the best investing opportunities…and bringing what I find to you. You won’t believe how he outperformed every hedge fund WORLDWIDE We scored an interview with the one man who beat the markets by nearly 1,200% in 2016… and outperformed every single hedge fund in the world. Wall Street’s No. 1 trader will explain how he achieved the impossible… and how you can too. Click here for details (while there’s still time). • And yet, the company’s been at this for the past four years… It’s sent out more than 13,000 packages. According to the sales manager I spoke with, none of those packages have been intercepted. The government leaves them alone. It’s not the only Canadian company doing this, either. Two other companies at the conference do the exact same thing. They were all there to tell people about their business…and to show off their product. See for yourself. • Vancouver was the first stop on my tour… I came here to get an up-close and personal look at Canada’s booming marijuana industry. You see, the legal marijuana market in Canada is being born before our eyes. We have the rare chance to get in on the ground floor of what should be a marijuana bull market for the ages. That’s why I went to the Cannabis Life Conference. I had to see how the industry was developing from the inside. And that raffle told me everything I needed to know…• When I got to the booth, about 15 people had entered the contest… Guesses ranged from 80 to 130 grams. I figured it was probably somewhere in between. So, I wrote down 111 grams. Just so you know, I didn’t win. I also don’t know how much was in the jar. They didn’t announce the winner that day. But here’s what I do know… If I won that contest, they would have given me the jar. And I’m not a medical marijuana patient…or even a Canadian resident. And that’s not even the craziest part.• The company would have shipped the marijuana directly to my doorstep… They wouldn’t use their own driver or even a private company. They would have sent the marijuana through Canada Post, Canada’s version of the U.S. Postal Service. If this sounds illegal, that’s because it is. You see, recreational marijuana isn’t legal in Canada yet. That won’t happen until next July. And yet, this company’s whole business is sending marijuana through the mail. They’re an online marijuana store. If you were in Canada, you could order high-grade marijuana directly off their website. The marijuana would show up at your doorstep a few days later. You don’t need to prove that you’re a medical marijuana patient, either. You just need to be at least 21 years of age. Again, this is totally illegal. Recommended Link • Now, I knew Canada was at the forefront of the global marijuana boom… But I had no idea how lax their marijuana regulations were until I saw it for myself. This isn’t just great news for recreational pot smokers. It’s also incredibly valuable information for investors. You see, everyone’s trying to figure out how to get rich off marijuana. Most investors are focusing on the United States. But the real opportunity is north of the 49th parallel…• Canada has been pioneering the global marijuana market for nearly two decades… It legalized medical marijuana nationwide back in 2000. And it’s been building out its legal marijuana market ever since. Last year, the government issued the first-ever marijuana export permits. These allow Canadian producers to ship medical marijuana to countries like Germany, Croatia, and Australia. Starting next July, you’ll be able to legally buy recreational marijuana across Canada. It will become the first major developed country to legalize marijuana outright.• It’s a much different story south of the border… There, the U.S. federal government still classifies marijuana as a Schedule I drug. This means that the feds consider it more dangerous than cocaine or methamphetamine. That’s the bad news. The good news is that legalization is sweeping across the country. Twenty-nine states (plus Washington, D.C.) have already legalized medical marijuana. Eight states (plus D.C.) have legalized recreational marijuana. At this point, the legal marijuana industry employs hundreds of thousands of people. It generates billions of dollars in tax revenue every year.• This is why Donald Trump won’t go after the industry like many people think… It would be political suicide, frankly. At the same time, I don’t see Trump legalizing marijuana at the federal level anytime soon. And U.S. companies will be at a huge disadvantage to Canadian companies as long as that’s the case. That’s why Canada is the place to get rich off marijuana right now. Don’t let this opportunity of a lifetime slip through your fingertips. To take advantage of this, consider buying the Horizons Medical Marijuana Life Sciences ETF (HMMJ.TO) today. This is Canada’s only marijuana ETF. It tracks 20 companies with exposure to the legal marijuana market. It’s a diversified, legal way to speculate on Canada’s imminent pot boom. But make no mistake. This fund could also soar in the coming years. After all, Canada’s legal marijuana industry is poised to quadruple in size over the next eight years. Not to mention that Canadian producers will get first crack at a $200 billion global marijuana market.Regards,Justin Spittler Vancouver, BC July 17, 2017 P.S. Nick Giambruno and I recently recommended a world-class Canadian marijuana company in Crisis Investing. This company was founded by a man many people call Canada’s “godfather of weed.” It’s one of the most innovative marijuana companies on the planet. More importantly, it could hand you 1,000% gains in the coming years. To find out why, sign up for Crisis Investing. Click here to get started. — Free Limited-time-only Cryptocurrency Webinar with Doug Casey Cryptocurrencies are going through the roof right now, and Doug Casey has taken notice, saying: “I think every speculator should give cryptocurrencies a look right now.” On Thursday, July 20, at 8pm (ET), Doug’s participating in a cryptocurrency training webinar. Click here for all of the event details including a $250,000 Bitcoin giveaway. Recommended Link
19 arrested in US for credit card, identity theft ring Citation: 36 indicted in global cybercrime ring that stole $530M (2018, February 7) retrieved 18 July 2019 from https://phys.org/news/2018-02-indicted-global-cybercrime-stole-530m.html © 2018 The Associated Press. All rights reserved. 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. Thirty-six people were indicted in connection with an international identity theft ring known as a “one-stop shop for cybercriminals” that sold stolen credit card information on the dark web, leading to losses of more than $530 million, U.S. prosecutors said Wednesday. The Infraud Organization—founded in 2010 and operated under the slogan “In Fraud We Trust”—used an online forum to buy and sell stolen credit card and bank account numbers, Social Security numbers and other personal information, the U.S. Justice Department said.Investigators believe the group’s nearly 11,000 members targeted more than 4.3 million credit cards, debit cards and bank accounts worldwide, Deputy Assistant Attorney General David Rybicki said.Most of the members of Infraud never met in person and only knew one another through their online usernames, he said. The organization’s goal was to become the premier site to purchase retail items with stolen or counterfeit credit card information, prosecutors said.The group’s hierarchy included administrators who managed the operation and membership, forum moderators and vendors who sold illicit products and services to members. Members of the group would then use the forum on the dark web—part of the internet often used for illegal activity—to gather information and facilitate the sale of the stolen data, officials said.The indictment unsealed Wednesday in Nevada marks the first time the Justice Department has arrested anyone in connection with Infraud, which Rybecki called one of the largest international cybercrime rings.”This case reflects the alarming and increasing threat posed by cybercrime,” Rybicki said. “The Department of Justice refuses to allow cybercriminals to hide behind the anonymity of the web while stealing personally identifying information, emptying bank accounts, and wreaking havoc on our nation’s digital infrastructure and financial system.”Thirteen people were taken into custody across the globe, including in California, New York and Alabama. Suspects arrested in France, the United Kingdom, Italy, Australia, Kosovo and Serbia were awaiting extradition. Explore further