Grid-state deformation in a no-jump non-Hermitian bosonic dimer

Abstract

Abstract We study the no-jump evolution of ideal grid states in a lossy bosonic dimer with differential decay. The effective non-Hermitian quadratic dynamics induces a complex symplectic flow in phase space that deforms both the primitive lattice vectors and the origin seed. The average decay rate controls common-mode attenuation, while coherent hopping and differential decay control the reduced dimer deformation. For resonant modes, the reduced displacement flow is oscillatory in the elliptic regime, linear at the exceptional point, and exponentially separating in the hyperbolic regime. Although projected lattice areas can change, the deformation comes from a determinant-one complex symplectic flow on the complexified phase space. For a Gaussian regularization of the origin seed in the resonant dimer, we derive the associated complex width matrix and show that the seed remains square-integrable and Gaussian for every positive initial width, all non-negative times, and all physical loss rates. For an initial two-mode qunaught product state, the lossless limit recovers the standard beam-splitter generation of a square GKP+ Bell pair, while the no-jump dynamics produces its non-Hermitian deformation. The full no-jump probability for a normalized finite-energy input sets the postselection cost and depends on its excitation-number distribution and the reduced dimer dynamics.