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Quantum Teleportation Between Photons From Two Distant Light Sources Achieved

1 month 1 week ago
Researchers in Germany achieved a major milestone for the future quantum internet by successfully teleporting quantum information between photons generated by two different, physically separated quantum dots -- something never accomplished before due to the difficulty of producing indistinguishable photons from remote sources. Phys.org reports: At the University of Stuttgart, the team succeeded in teleporting the polarization state of a photon originating from one quantum dot to another photon from a second quantum dot. One quantum dot generates a single photon, the other an entangled photon pair. Entangled means that the two particles constitute a single quantum entity, even when they are physically separated. One of the two particles travels to the second quantum dot and interferes with its light particle. The two overlap. Because of this superposition, the information of the single photon is transferred to the distant partner of the pair. Instrumental for the success of the experiment were quantum frequency converters, which compensate for residual frequency differences between the photons. These converters were developed by a team led by Prof. Christoph Becher, an expert in quantum optics at Saarland University. [...] In the Stuttgart experiment, the quantum dots were separated only by an optical fiber of about 10 m length. "But we are working on achieving considerably greater distances," says Strobel. In earlier work, the team had shown that the entanglement of the quantum dot photons remains intact even after a 36-kilometer transmission through the city center of Stuttgart. Another aim is to increase the current success rate of teleportation, which currently stands at just over 70%. Fluctuations in the quantum dot still lead to slight differences in the photons. The findings have been published in the journal Nature Communications.

Read more of this story at Slashdot.

BeauHD

CodeSOD: Invalid Route and Invalid Route

1 month 1 week ago

Someone wanted to make sure that invalid routes logged an error in their Go web application. Artem found this when looking at production code.

if (requestUriPath != "/config:system") && (requestUriPath != "/config:system/ntp") && (requestUriPath != "/config:system/ntp/servers") && (requestUriPath != "/config:system/ntp/servers/server") && (requestUriPath != "/config:system/ntp/servers/server/config") && (requestUriPath != "/config:system/ntp/servers/server/config/address") && (requestUriPath != "/config:system/ntp/servers/server/config/key-id") && (requestUriPath != "/config:system/ntp/servers/server/config/minpoll") && (requestUriPath != "/config:system/ntp/servers/server/config/maxpoll") && (requestUriPath != "/config:system/ntp/servers/server/config/version") && (requestUriPath != "/config:system/ntp/servers/server/state") && (requestUriPath != "/config:system/ntp/servers/server/state/address") && (requestUriPath != "/config:system/ntp/servers/server/state/key-id") && (requestUriPath != "/config:system/ntp/servers/server/state/minpoll") && (requestUriPath != "/config:system/ntp/servers/server/state/maxpoll") && (requestUriPath != "/config:system/ntp/servers/server/state/version") { log.Info("ProcessGetNtpServer: no return of ntp server state for ", requestUriPath) return nil }

The most disturbing part of this, for Artem, isn't that someone wrote this code and pushed it to production. It's that, according to git blame, two people wrote this code, because the first developer didn't include all the cases.

For the record, the application does have an actual router module, which can trigger logging on invalid routes.

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Remy Porter

Palo Alto CEO tips nation-states to weaponize quantum computing by 2029

1 month 1 week ago
Company thinks you’ll contemplate replacing most security kit in the next few years to stay safe

Palo Alto Networks CEO Nikesh Arora has suggested hostile nation-states will possess quantum computers in 2029, or even a little earlier, at which point most security appliances will need to be replaced.…

Simon Sharwood

In the AI Race, Chinese Talent Still Drives American Research

1 month 1 week ago
An anonymous reader quotes a report from the New York Times: When Mark Zuckerberg, Meta's chief executive, unveiled the company's Superintelligence Lab in June, he named 11 artificial intelligence researchers who were joining his ambitious effort to build a machine more powerful than the human brain. All 11 were immigrants educated in other countries. Seven were born in China, according to a memo viewed by The New York Times. Although many American executives, government officials and pundits have spent months painting China as the enemy of America's rapid push into A.I., much of the groundbreaking research emerging from the United States is driven by Chinese talent. Two new studies show that researchers born and educated in China have for years played major roles inside leading U.S. artificial intelligence labs. They also continue to drive important A.I. research in industry and academia, despite the Trump administration's crackdown on immigration and growing anti-China sentiment in Silicon Valley. The research, from two organizations, provides a detailed look at how much the American tech industry continues to rely on engineers from China, particularly in A.I. The findings also offer a more nuanced understanding of how researchers in the two countries continue to collaborate, despite increasingly heated language from Washington and Beijing.

Read more of this story at Slashdot.

BeauHD