In order to understand how and why quantum cryptographic key exchange works, it is useful to understand a little bit of quantum mechanics. You can skip this section if you like and take my word for what the results are - but if you were a trusting person you wouldn't be reading a paper on cryptography would you? Besides, quantum cryptography can be thought of as a special case (probably the most simple case) of the broader topic of quantum computing. As such, understanding the properties of quantum mechanics that make quantum cryptography possible and useful will provide a basis for understanding more complex quantum phenomena (if this introduction should pique your interest in this area).
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