Abstract
The no-cloning theorem states that an arbitrary quantum state cannot be copied from one qubit and duplicated on another qubit. We offer a proof of this theorem and illustrate how quantum states can be teleported between two qubits. The Bell and Clauser-Horne-Shimony-Holt inequalities are introduced and shown to be demonstrable features of entangled quantum systems. We discuss how the private key distribution problem is dealt with using quantum key distribution (QKD). The BB84 and Ekert protocols are examples of the latter, and we review and illustrate their implementation. We show how entangled states enable dense coding and offer a brief synopsis of Greenberger-Horne-Zeilinger GHZ states and their application.
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Notes
- 1.
Correlation experiments where anticipated by Chien-Shiung Wu as early as 1950 [12].
- 2.
As you might guess from the film’s title, things did not work out well for our anti-hero.
- 3.
Flying qubits are physically transported between two locations. Typically they are photons traveling through empty space or some medium.
- 4.
Two points in space-time that cannot be bridged by a light-beam, or anything moving less than the speed of light.
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Zygelman, B. (2018). No-Cloning Theorem, Quantum Teleportation and Spooky Correlations. In: A First Introduction to Quantum Computing and Information. Springer, Cham. https://doi.org/10.1007/978-3-319-91629-3_6
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DOI: https://doi.org/10.1007/978-3-319-91629-3_6
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