Download PDF by Daniel J. Rogers, Ravi Sandhu: Broadband Quantum Cryptography (Synthesis Lectures on

By Daniel J. Rogers, Ravi Sandhu

ISBN-10: 1608450597

ISBN-13: 9781608450596

ISBN-10: 1608450600

ISBN-13: 9781608450602

Quantum cryptography is a quickly constructing box that attracts from a couple of disciplines, from quantum optics to info conception to electric engineering. through combining a few basic quantum mechanical ideas of unmarried photons with numerous elements of knowledge idea, quantum cryptography represents a primary shift within the foundation for safeguard from numerical complexity to the basic actual nature of the communications channel. As such, it offers the holy grail of information defense: theoretically unbreakable encryption. after all, enforcing quantum cryptography in genuine broadband communications structures poses a few certain demanding situations, together with producing unmarried photons, distilling random keys from the quantum key distribution procedure, and preserving protection at either the theoretical and functional point. total, quantum cryptography has a spot within the historical past of mystery retaining as a singular and most likely helpful paradigm shift within the method of broadband information encryption. desk of Contents: creation / components of Classical Cryptography / The Quantum Mechanics of Photons / basics of Quantum Key Distribution / info idea and Key Reconciliation / elements for Broadband QKD / A Survey of QKD Implementations / end - QKD on the market

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It may be that as humans, we simply have no intuition about such matters and must rely solely on the logic and observation of scientific inquiry. However, the philosophical implications are equally fascinating; fundamentally, one can no longer consider the two electrons in the above gedanken experiment to be independent objects. Instead, one must think of them as a single quantum object, a super-particle if you will, that is arbitrarily large. Since wavefunctions are defined everywhere in the universe, we can think of the entangled pair of electrons as a single wavefunction upon which both Alice and Bob act.

Now imagine a quantum mechanical alternative based on the simple polarizing beamsplitter experiment described in Chapter 3. 1. Suppose every time the H arm detector ’clicked,’ we wrote down a 1, and every time the V arm detector ’clicked,’ we wrote down a 0. What would we end up with? Since we would produce 1’s and 0’s each with 50% probability, we would obtain a truly random bit sequence. In fact, if all of the components were perfectly efficient and aligned, this simple source would produce the most random sequence possible in the natural world!

It is fortuitous that these concepts also happen to be the most profound and fundamental ideas underlying entanglement, so the subject provides a good basis for understanding the concept as it will pertain to future, more involved quantum information applications. , 1935]. A good description was originally provided by J. S. Bell in [Bell, 1966], to whom we will return shortly. Bell’s argument goes as follows: Consider two spin one-half particles created in the singlet spin state propagating in opposite directions - say, two electrons formed from a pion decay.

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Broadband Quantum Cryptography (Synthesis Lectures on Quantum Computing) by Daniel J. Rogers, Ravi Sandhu

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