Dear all,
Next Tuesday's talk will be in the Pauli Room at 5pm by Shun Watanabe.
Roger
Title:
Tomography increases key rates of quantum key distribution protocols
Abstract:
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.