Tomography increases key rates of quantum-key-distribution protocols

Details Tomography increases key rates of quantum-key-distribution protocols Tomography increases key rates of quantum-key-distribution protocols

2008-02-18

arxiv.org/abs/0802.2419v2

Phys. Rev. A 78, 042316 (2008)

Physics

Quantum Physics

13 pages, 1 figure, REVTeX4. To be published in PRA. Version 2 adds many references, a closed form key rate formula for unital

Scientific paper

10.1103/PhysRevA.78.042316

We construct a practically implementable classical processing for the BB84 protocol and the six-state protocol that fully utilizes the accurate channel estimation method, which is also known as the quantum tomography. Our proposed processing yields at least as high key rate as the standard processing by Shor and Preskill. We show two examples of quantum channels over which the key rate of our proposed processing is strictly higher than the standard processing. In the second example, the BB84 protocol with our proposed processing yields a positive key rate even though the so-called error rate is higher than the 25% limit.

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