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Unbreakable: China Doubles Down On Quantum Internet

posted by Fnord666 on Wednesday August 09 2017, @02:46AM   
from the what-an-entangled-web-they-weave dept.

Phoenix666 writes:

In the race for safer ciphers, China just quantum-leap frogged the rest of the world.

[...] Now, China aims to escape that contest entirely with the creation of a communication network not secured by math, but guaranteed by the fundamental rules of nature. A team has demonstrated mastery over the secret sauce behind such a "quantum internet" with their satellite Micius, which recently smashed the distance record for creating a bizarre link between light particles known as entanglement.

"They are years ahead of everyone else in this technology," says Vadim Makarov, head of a quantum hacking lab at the University of Waterloo in Canada, who was not involved. "It's absolutely awesome."

Launched August 2016, the Micius satellite successfully entangled photons between two Chinese towns almost 750 miles apart. The experiment bested former fiber-optics setups by a factor of 10, a feat chief architect Jian-Wei Pan says others dismissed as "a crazy idea" when he first proposed it back in 2003. The accomplishment proves possible the ultimate aim of cryptography: an invincible code system theoretically capable of instantly connecting any two (or more) points on Earth.

No Man-In-The-Middle for you!

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Original Submission

• Re:invincible code? Re:invincible code? (Score: 3, Interesting) by maxwell demon on Wednesday August 09 2017, @09:03AM (2 children)

  by maxwell demon (1608) on Wednesday August 09 2017, @09:03AM (#551028) Journal

  Which will be pointless, those boxes no longer containany thing but noise, and flipped noise is still noise.

  The boxes Charly has (one from Alice and one from Bob) will contain noise. The boxes Alice and Bob retained are not altered by Charlie's application of the XOR mechanism. And it is one of those boxes where the bit flips would be applied.

  For example:

  Action              Alice           Bob              Charlie
  :
  Pair creations      [0101],[0101]   [0011],[0011]    (none)
  :
  Sending of one box
  each to Charlie     [0101]          [0011]           [0101],[0011]
  :
  XOR measurement     [0101]          [0011]           0110,[****],[****]
  by Charlie
  :
  Sending open result [0101]          [0011],0110      0110,[****],[****]
  from Charlie to Bob
  :
  Bob applying        [0101]          [0101],0110      0110,[****],[****]
  bit flips

  Here the digit strings in square brackets (like [0101]) denote the boxes, while strings without boxes denote open information (i.e. the result of Charlie's XOR mechanism application). As you can see, in the end, Alice and Bob share a pair of "entangled" boxes (boxes with the same content).

  Note: The colons above are to work around an apparent bug in the ecode tag, which seems to switch to a proportional font on an empty line:

  This line is in fixed font, as it should be.

  This line is in proportional font instead.

  --
  The Tao of math: The numbers you can count are not the real numbers.

  Parent

  Starting Score:	1		point
  Moderation		+1
  Interesting=1, Total=1
  Extra 'Interesting' Modifier		0
  Karma-Bonus Modifier		+1
  Total Score:		3

• Inserting white space into ECODE tags Inserting white space into ECODE tags (Score: 2) by number6 on Wednesday August 09 2017, @10:28AM (1 child)

  by number6 (1831) on Wednesday August 09 2017, @10:28AM (#551049) Journal

  To have a whitespace line use   & n b s p ;   (https://en.wikipedia.org/wiki/Non-breaking_space)

  Line one, has fixed font and is enclosed within 'ecode' tags.
   
  Line three, has fixed font and is enclosed within the same 'ecode' tags.

  Parent

  • Re:Inserting white space into ECODE tags (Score: 0) by Anonymous Coward on Wednesday August 09 2017, @12:22PM

    by Anonymous Coward on Wednesday August 09 2017, @12:22PM (#551064)

    While that's a less visible workaround, it's still a workaround. It shouldn't be needed.

    Parent