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The first data ever transmitted through Arpanet, the precursor to the Internet, leapt from a computer at UCLA to one at the Stanford Research Institute in Palo Alto on October 29, 1969.

That evening, the UCLA team called the SRI team on the phone and started typing "LOGIN". "We dialed L and asked, 'Did you get L? "Recalled UCLA computer scientist Leonard Klinerock recently. "Yes, the SRI response came. We called O and asked, "Did you get O?" "Yep." We wrote G and asked "Did you download G?" Crash! The SRI host had crashed. This was the first message that initiated the revolution we now call the Internet.

The ability of networks to transmit data ̵

1; as well as their tendency to disrupt or otherwise behave in unpredictable ways – has always fascinated Stephanie Wener. "On a single computer, things will go well and consistently," says Wehnner, a physicist and computer scientist at Delft University of Technology. "Many unexpected things can happen on a network." This is true in two senses: The programs on connected computers interfere with each other with surprising effects. And network users are getting creative. With the Internet, Wenner noted, initially "people thought we would use it to send some files."

Wehner first started online around 1992, a few years before it became easy. A teenager in Germany at the time and already an agile computer programmer, she soon became a hacker on the newly created Internet. At 20, she got a job as a "good" hacker, exploiting the vulnerabilities of the web on behalf of an ISP. Then she gets bored of hacking and seeks a deeper understanding of the transmission of information and networks.

Wehner is already one of the intellectual leaders in the effort to create a new kind of Internet from scratch. She is working to create a "quantum Internet" network that would transmit instead of the classic bits with either 0 or 1 or 1 quantum bits, with both options 0 and 1. These "cubes" can be made of photons which are in combination of two different polarizations. Being able to send cubes from one place to another via fiber optics may not transform society as thoroughly as the classic Internet, but it will again revolutionize many aspects of science and culture, from security to computing to astronomy.

Wehner is the coordinator of the Quantum Internet Alliance, an initiative of the European Union to build a network for the transmission of quantum information across the continent. In an article in Science last October, she and two co-authors laid out a six-step plan for implementing the quantum Internet, where each stage of development would support new algorithms and applications. The first phase is already underway, with the construction of a demonstration quantum network that will connect four cities in the Netherlands – a kind of analogue of Arpanet. Tracey Northup, a member of the Quantum Internet Alliance based at the University of Innsbruck, praised "Stephanie's breadth of vision and her commitment to building the kind of scale structures that will make it happen"

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