Conditional Generation Scheme for a High-fidelity Yurke-Stoler States by Mixing Two Coherent Beams with Squeezed Vacuum State

TL;DR

This paper proposes a method to generate high-fidelity Yurke-Stoler states using two beam splitters with squeezed and coherent inputs, achieving fidelities over 0.9999 through phase and amplitude control.

Contribution

It introduces specific numerical conditions for high-fidelity Yurke-Stoler state generation with a novel cascade beam splitter setup involving squeezed and coherent states.

Findings

Achieved theoretical fidelity over 0.9999

Controlled phase and amplitude enable state manipulation

Numerical conditions for optimal state generation

Abstract

The numerical conditions to generate a high-fidelity Yurke-Stoler states ($|\alpha>+ e^{i \psi} |-\alpha>$)were found for two cascade-placed beam splitters with one squeezed state input and two coherent state inputs. Controlling the amplitude and the phases of beams, allows for various Yurke-Stoler states to be manipulated with ultra high-fidelity, and the expected theoretical fidelity is of more than 0.9999.