30 research outputs found
SarDub19: An Error Estimation and Reconciliation Protocol
Aside from significant advancements in the development of optical and quantum
components, the performance of practical quantum key distribution systems is
largely determined by the type and settings of the error key reconciliation
procedure. It is realized through public channel and it dominates the
communication complexity of the quantum key distribution process. The practical
utilization significantly depends on the computational capacities that are of
great importance in satellite-oriented quantum communications. Here we present
SarDub19 error key estimation and reconciliation protocol that improves
performances of practical quantum systems
Classical Capacity of Arbitrarily Distributed Noisy Quantum Channels
With the rapid deployment of quantum computers and quantum satellites, there
is a pressing need to design and deploy quantum and hybrid classical-quantum
networks capable of exchanging classical information. In this context, we
conduct the foundational study on the impact of a mixture of classical and
quantum noise on an arbitrary quantum channel carrying classical information.
The rationale behind considering such mixed noise is that quantum noise can
arise from different entanglement and discord in quantum transmission
scenarios, like different memories and repeater technologies, while classical
noise can arise from the coexistence with the classical signal. Towards this
end, we derive the distribution of the mixed noise from a classical system's
perspective, and formulate the achievable channel capacity over an arbitrary
distributed quantum channel in presence of the mixed noise. Numerical results
demonstrate that capacity increases with the increase in the number of photons
per usage