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SAN FRANCISCO (AP) — Google announced Wednesday it has achieved a breakthrough in quantum computing, saying it has developed an experimental processor that took just minutes to complete a calculation that would take the world's best supercomputer thousands of years.The feat could open the door someday to machines so blazingly fast that they could revolutionize such tasks as finding new medicines, developing vastly smarter artificial intelligence systems and, most ominously, cracking the encryption that protects some of the world's most closely guarded secrets.Such practical uses are still probably decades away, scientists said. But the latest findings, published in the scientific journal Nature, show that "quantum speedup is achievable in a real-world system and is not precluded by any hidden physical laws," the researchers wrote.RELATED: Google Maps will now allow drivers to report hazards, slowdowns and speed trapsBig tech companies including Microsoft, IBM and Intel are avidly pursuing quantum computing, a new and somewhat bewildering technology for vastly sped-up information processing.While conventional computing relies on bits, or pieces of data that bear either a one or zero, quantum computing employs quantum bits, or qubits, that contain values of one and zero simultaneously.But quantum computing requires placing the fragile and volatile qubits in colder-than-outer-space-refrigerators to control them.Google's quantum processor looks like an upside-down garbage can, out of which comes a series of tubes used to conduct signals to a chip. The whole thing is stored in a cool chamber to protect the chip.RELATED: Google unveils new Pixel 4 smartphone, Pixel BudsGoogle said that its quantum processor, called Sycamore, finished a calculation in 3 minutes, 20 seconds — and that it would take the world's fastest supercomputer 10,000 years to do the same thing.The calculation was a random sampling problem, similar to looking at the various combinations that could come from dice or a gambling machine. It has little practical value, other than to test how well the processor works."The more interesting milestone will be a useful application," said Chris Monroe, a University of Maryland physicist who is also the founder of quantum startup IonQ.Google's findings, however, faced pushback from other industry researchers. A version of Google's paper leaked online last month.IBM took issue with Google's claim that it had achieved "quantum supremacy," or the point when a quantum computer can perform a calculation that a traditional computer can't complete within its lifetime.IBM researchers said that its IBM-developed supercomputer, called Summit, could actually do the calculation in 2.5 days.Google disputed IBM's claims.Whether or not Google achieved "quantum supremacy," the research suggests the field is maturing."The quantum supremacy milestone allegedly achieved by Google is a pivotal step in the quest for practical quantum computers," John Preskill, the Caltech professor who coined the term "quantum supremacy," wrote in a column after the paper was leaked.It means quantum computing research can enter a new stage, he wrote, though a significant effect on society "may still be decades away."One feared outcome — though experts said it is a long way off — is a computer powerful enough to break today's best cryptography.Quantum computers might also one day lead to the development of better artificial intelligence systems to guide financial portfolios, crop yields or transportation routes.The promise of such applications has attracted interest from the U.S., China and other governments. President Donald Trump last year signed a measure to spend more than .2 billion over five years for quantum research across the federal government. 3797

SAN FRANCISCO (AP) — A firefighter who died while helping people evacuate a Northern California blaze was killed by a fire tornado that at one point reached a temperature of 2,700 degrees Fahrenheit (1,480 degrees Celsius), officials said.Redding firefighter Jeremy Stoke died after he was enveloped in seconds by a fire tornado with a diameter of 1,000 feet (300 meters) and winds up to 165 mph (265 kph), the California Department of Forestry and Fire Protection said in a report released Wednesday detailing his death and the death of a bulldozer operator.Videos released with the report show the massive blaze burning in a populated area and sending a cloud of thick smoke up into the air with flames swirling up into the sky.RELATED: Firefighter killed battling Mendocino Complex fire  The tornado ripped roofs off houses and flung power line towers, cars and a shipping container into the air near the spot where Stoke was overtaken by the flames, according to the report.Cal Fire officials said that on July 26, the 37-year-old fire inspector was driving his pickup truck down a Redding road, working on evacuating people. One minute later he radioed out a "mayday" call saying he was getting burned and needed help.Stoke "identified himself by his radio call sign, and stated that he needed a water drop and was getting burned over," the report said.When an engine captain tried to contact him shortly after, there was no response, it said."Observations from witnesses and other evidence suggest that either several fire tornadoes occurred at different locations and times, or one fire tornado formed and then periodically weakened and strengthened causing several separate damage areas," the report said.Stoke, whose remains were found the following day, was one of eight people killed since the blaze started on July 23 with a spark from a vehicle driving on a flat tire.RELATED: A flat tire started the deadly Carr Fire and days of devastation in California  The wildfire has destroyed nearly 1,100 homes. It was 71 percent contained as of Thursday.The report also detailed the death of private bulldozer operator Don Smith, 81, of Pollock Pines, who was killed when his bulldozer was caught in the flames while trying to improve a fire line, defending a home during what the officials say were "extraordinary fire weather conditions."Both deaths and the injuries occurred within an hour and 50 minutes in one 3-mile (5-kilometer) stretch.Smith was trying to improve a previously constructed a fire line near the Buckeye Water Treatment Plant outside Redding after 5 p.m. on July 26 when other firefighters noticed "a rapid increase in fire activity."It jumped the fire line and a Cal Fire crew chief said he made several radio attempts to tell Smith to "get out of there." Two firefighters in the area also "recognized the urgency of the situation" and tried to reach Smith on foot but had to turn back because of the encroaching flames.Smith reported that he was cut off by the fire and was pushing on in his 2002 John Deere open cab bulldozer in an attempt to reach a safe area. He also requested water drops and four helicopters began dropping water through the smoke and flames around Smith's last known location.Once the smoke cleared, a pilot saw that Smith's dozer had been engulfed in flames and there was no sign of the protective metallic tent that firefighters deploy as a desperate measure when they are about to be overrun by fire. After two attempts, a fire captain was able to reach the bulldozer two hours later and confirmed that Smith was dead. 3592

SAN DIEGO (KGTV)- San Diego County barely avoided falling back into the purple tier of the state’s reopening system, staying in the red for now.The color-coded tier system has been difficult for many business owners to deal with as they wonder if they will face more restrictions in the coming weeks.“We are working with the state to share our concerns and thoughts about the metrics they are using to put our county in the different tiers,” said Greg Cox, San Diego County Supervisor. "The reality is we remain at risk of being moved to the more restrictive tier in the future if we don’t do those things that we know we need to do.”Dr. Wilma Wooten, the county’s public health officer, said she and other health officers across the state have been pushing for the state to improve its metrics system to go beyond case rate and positivity rate.She would like to see three things happen.“If counties are maintaining hospitalizations and hospital capacities to somehow get credit for that, and also get credit for contact tracing,” she said.Wooten said the county should also get credit for providing access to COVID-19 testing in vulnerable communities hit the hardest.“San Diego has done an excellent job to date of getting access to testing in those communities that are hit the hardest,” she said.On Tuesday, the County Board of Supervisors passed a motion in a 4 to 1 vote to send a letter to the state backing Wooten’s effort in revising the reopening criteria.Wooten is urging members of the public to continue wearing a facial covering, washing hands, avoiding large gatherings, and staying home when sick, especially as flu season is on the way.“We do not have a vaccine for COVID-19, but we have a vaccine for the flu,” she said. “Getting the flu vaccine is the most important step in preventing the flu.” 1822

SAN DIEGO (KGTV) -- Thousands of refugees, immigrants and asylum seekers are finding a place to stay through the Safe Harbors Network, an organization which got its start at the Christ United Methodist Church in Normal Heights. Pastor Bill Jenkins began giving shelter to Haitian refugees back in 2009. And for quite a while the church was the only immigrant welcoming shelter in southern California. Eventually, the Safe Harbors Network was created. It's a growing collection of churches, organizations, and individuals that house refugees, immigrants and asylum seekers. Pastor Jenkins says he's seen an explosion of interest from people wanting to help in recent months after Trump's zero-tolerance immigration policy went into effect. Safe Harbors works in cooperation with ICE to give shelter to people awaiting their day in court.   886

SAN DIEGO (KGTV)- The high temperatures, dry brush, and low humidity are leading to elevated fire danger in San Diego County this week.Cal Fire San Diego is asking everyone to be prepared for the possibility of a wildfire igniting.“We depend on the public to be careful; we depend on the public to be prepared at a moment’s notice to evacuate,” said Cal Fire Captain, Isaac Sanchez.“The fact that the winds aren’t there, it does not help us sleep at night; we’re still very dry. It’s still October, and we know that even though there aren’t winds now, we can bet money that there will be winds later.”As fire danger remains a threat across the county, families braved the heat taking schoolwork outside at Mast Park in Santee, after being stuck at home for months.“It’s so much easier for the kids to stay motivated on getting their work done,” Jennifer Sailler. “It’s harder to stay inside our home with the AC running than it is to be outside in the warm heat.”The heat is also keeping business going for some.“My job requires me to have a close relationship with snakes and the sun,” said Alex Trejo, So-Cal Rattlesnake Removal. “When it’s hot, what they’re actually doing is trying to find shelter. “Trejo removes rattlesnakes from properties and relocates them to areas where they can have a second chance at life.He said he’s been getting more calls for rattlesnake removals in the East County during the hot weather.“It’s very important to understand the nature of the snake; the snake is not out to hurt people, the snake is a survival expert,” he said. “My priority is making sure families are safe during this heatwave because they will be coming on people’s properties right now.”The heat advisory will remain in effect until 5 PM Friday. 1757

来源：资阳报