In contrast to Hermitian systems, the modes of non-Hermitian systems are generally nonorthogonal. As a result, the power of the system signal depends not only on the mode amplitudes but also on the ...

Two papers report superconducting travelling-wave parametric amplifiers that can operate in two distinct modes and could potentially eliminate the need for isolators in quantum measurement systems.

The purpose of this paper is to compare in-sample and out-of-sample performances of three parametric and non-parametric early warning systems (EWS) for currency crises in emerging market economies ...