Tatsi G, Mazzarella L, Jeffers J. 2021, ‘Parity-swap state comparison amplifier for Schrödinger cat states’, Phys. Rev. A 103, 023709. DOI: https://doi.org/10.1103/PhysRevA.103.023709
We propose a postselecting parity-swap amplifier for Schrödinger 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.
