Explicit definition of $\mathcal{P}\mathcal{T}$ symmetry for non-unitary quantum walks with gain and loss

Ken Mochizuki, Dakyeong Kim, Hideaki Obuse

$\mathcal{P}\mathcal{T}$ symmetry, that is, a combined parity and time-reversal symmetry is a key milestone for non-Hermite systems exhibiting entirely real eigenenergy. In the present work,…