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Quantum cryptographic key distribution networks with untrusted switches

  • US 7,324,647 B1
  • Filed: 08/31/2001
  • Issued: 01/29/2008
  • Est. Priority Date: 10/23/2000
  • Status: Expired due to Term
First Claim
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1. A method of securely transmitting light information in a network along a path comprised of a plurality of untrusted network devices, said untrusted network devices comprising a plurality of switching devices, and said method comprising:

  • sending at least one setup message to one of said network devices;

    based on said setup message, configuring at least one of said network devices to direct said light along said path to a terminal endpoint using at least one of said switching devices, whereby a configured path is established;

    sending a plurality of pulses of said light along said configured path, said pulses having a first set of randomly selected quantum bases; and

    measuring a quantum state of said light pulses using a second set of randomly selected quantum bases, thereby providing a measured quantum state.

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