Optical Synthesis of Large-Amplitude Squeezed Coherent-State Superpositions with Minimal Resources.

摘要: We propose and experimentally realize a novel versatile protocol that allows the quantum state engineering of heralded optical coherent-state superpositions. This scheme relies on two-mode squeezed state, linear mixing, n-photon detection. It is optimally using expensive non-Gaussian resources to build up only key part targeted state. In experimental case two-photon detection based high-efficiency superconducting nanowire single-photon detectors, freely propagating exhibits 67% fidelity with even superposition size |α|(2)=3. The demonstrated procedure achieved rate will facilitate use such superpositions in subsequent protocols, including fundamental tests hybrid information implementations.