Curator's Take
This article demonstrates the first systematic method to generate and manipulate travelling cat‑qubit states directly from vacuum by using time‑dependent two‑photon drives in Kerr or dissipative bosonic platforms. By showing that logical control can be maintained during emission and that the process tolerates realistic photon loss and dephasing, it bridges the gap between stationary error‑corrected bosonic qubits and modular quantum networks, a step beyond earlier work limited to static cavity cat states. If realized experimentally, the technique could enable programmable, error‑detectable links between distributed quantum processors, though scaling up will still require precise engineering of nonlinearities and dissipation rates.
— Mark Eatherly
Summary
We propose a framework for the direct generation of flying cat-qubit states from vacuum using time-dependent two-photon drives in nonlinear bosonic systems. We study both Kerr-based and two-photon-dissipation-based generation. By engineering Kerr nonlinearity, two-photon driving, and dissipation, we demonstrate logical control of a cat qubit during its generation and emission, while its quantum information is simultaneously shared between the nonlinear system and the propagating output field. We further analyze the effects of photon loss and pure dephasing, showing that both the state generation and logical control remain robust under realistic noise conditions. These results provide a route toward programmable bosonic quantum networks and future propagating error-correctable encodings.