| 摘要 |
A method of verifying the position of a tagging device is described. The method comprises: storing response information in a quantum state of a quantum entity, the quantum entity comprising an entangled pair; separating the entangled pair into first and second entangled particles; conveying the first and second entangled particles to first and second emitters respectively; emitting the first and second particles of the entangled pair respectively from the first and second emitters to the tagging device; recombining the first and second entangled particles in the tagging device to determine the response information; transmitting a signal from the tagging device to at least one of a plurality of detectors; 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 comparing the or each receiving detector and the arrival time of the signal at the or each receiving detector with at least one expected receiving detector and an expected arrival time of the signal for the or each expected receiving detector. Matching the expected and actual signal arrival time for an expected detector verifies the position of the tagging device.
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