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Quantum Computing Regulation Already?

Posted by Zonk on from the jumping-the-gun dept.

RMX writes "A new CNet article discusses the possibility of regulating quantum computing. We already see our top tier US VCs investing in Quantum computing companies outside the country. Apparently the feds seem to think regulating the amount of technology that can be sent overseas will make the US safer." From the article: "Only rough prototypes of quantum computers presently exist. But if a large-scale model can be built, in theory it could break codes used to scramble information on the Internet, in banking, and within federal agencies. A certain class of encryption algorithms relies for security on the near-impossibility of factoring large numbers quickly. But quantum computers, at least on paper, can do that calculation millions of times faster than a conventional microprocessor. "

2 of 238 comments (clear)

  1. Why can't other countries develope their own? by Anonymous Coward · · Score: 4, Insightful

    Even if the US regulates what can be exported, how will that stop other countries from developing their own quantum computers with the same technology? We can't count on everyone else having slower computers if faster ones exist...

  2. Re:Setec Astronomy by Rich0 · · Score: 4, Insightful

    You are referring no doubt to quantum cryptography. This is an area which actually is only related to quantum computing loosely at best. We are already capable of implementing it somewhat practically - unlike quantum computing.

    Quantum cryptography isn't really cryptography - it is instead a method of transmitting data between two points without relays which can allow sender and receiver to determine whether the transmission was intercepted. In practice it can be used for symmetric key exchange (such as a one time pad). If the key wasn't intercepted you use it, if it was then you just keep trying until the interceptor (or you) gives up.

    The problem with quantum crypto is that it requires a direct transmission of photons from Alice to Bob. You can't have a relay station in-between, unless you are willing to guarantee its security (any relay station would allow for interception of the signal when it isn't entangled - which cannot be detected).

    The bottom line right now is that it only works for very sensitive communications via line of sight or fiber optic. Most people submitting their credit card numbers to a website don't have a direct fiber optic line without retransmission between them and the merchant.

    My guess is that quantum crypto won't ever prove to be very practical for general use - except maybe in space (where lines of sight extend much farther).