Effect of measurement errors on the failure probability of quantum-aided Byzantine agreement
K. KYPAROS (TU Delft - Electrical Engineering, Mathematics and Computer Science)
T.J. Coopmans – Mentor (TU Delft - QCD/Coopmans Group)
A. Van Van Deursen – Graduation committee member (TU Delft - Software Engineering)
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Abstract
Most
classical Byzantine agreement protocols between n nodes offer a fault tolerance
t of up to t < n/3. Quantum fault-tolerant consensus protocols have been
proposed that achieve a tolerance of t < n/2 and are therefore worth
studying. In this paper, we assess the failure probability of a previously
proposed quantum-aided weak broad- cast protocol and how it is affected by a
physical error source. Specifically, we study the effect of measurement error
noise. We simulate the protocol as-is on a four-node quantum network composed
of NV-center devices, both with zero and with one faulty node. We then apply a
measurement error noise model and compare the failure prob- ability with the
noiseless version. The noise "strength" is also varied in order to
assess whether the failure probability can be reduced using improved hardware.
We show that measurement errors have a significant negative effect on the
failure probability of the protocol. In fact, even with 10x improved hardware
parameters, the protocol does not achieve an acceptable failure probability.