Quantum phase distributions of amplified Schrödinger-cat states of light
Vladimír Bužek, M. S. Kim, Ts. Gantsog · Physical Review A · 1993
We study the phase properties of quantum superpositions of two coherent states (Schr\"odinger-cat states) amplified by phase-sensitive (squeezed) amplifiers. We show that a phase-sensitive amplifier with a properly chosen phase can preserve the phase distribution of the Schr\"odinger-cat-state input.