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Tagging systems

  • US 7,075,438 B2
  • Filed: 07/30/2004
  • Issued: 07/11/2006
  • Est. Priority Date: 07/30/2004
  • Status: Expired due to Fees
First Claim
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1. A method of verifying the position of a tagging device, the method comprising:

  • (A) storing response information in a quantum state of a quantum entity, the quantum entity comprising an entangled pair;

    (B) separating the entangled pair into first and second entangled particles;

    (C) conveying the first and second entangled particles to first and second emitters respectively;

    (D) emitting the first and second particles of the entangled pair respectively from the first and second emitters to the tagging device;

    (E) recombining the first and second entangled particles in the tagging device to determine the response information;

    (F) transmitting a signal from the tagging device to at least one of a plurality of detectors;

    (G) detecting and recording the arrival time of the signal at the or each receiving detector, the or each receiving detector being selected on the basis of the determined response information; and

    (H) comparing the arrival time of the signal at the or each receiving detector with an expected arrival time of the signal for the or each expected receiving detector;

    wherein matching the expected and actual signal arrival time for an expected detector verifies the position of the tagging device.

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