Parity-swap state comparison amplifier for Schrödinger cat states
Gioan Tatsi, Luca Mazzarella, John R. Jeffers · Physical Review A · 2021
We propose a postselecting parity-swap amplifier for Schr\"odinger cat states that does not require the amplified state to be known a priori. The device is based on a previously implemented state comparison amplifier for coherent states. It consumes only Gaussian resource states, which provides an advantage over some cat state amplifiers. It requires simple Geiger-mode photodetectors and works with high fidelity and approximately twofold gain.