Filtration and Extraction of Quantum States from Classical Inputs

TL;DR

This paper introduces a method using nonlinear Mach-Zehnder interferometers to efficiently generate specific quantum states from classical light sources, advancing quantum state preparation techniques.

Contribution

It demonstrates that cascaded NMZIs can deterministically extract arbitrary quantum states from strong coherent states, with high efficiency and potential for various bosonic systems.

Findings

Cascaded NMZIs can extract arbitrary quantum states from strong coherent states.

The proposed method is highly efficient in input power and cascade levels.

The protocol can be extended to various bosonic mode systems.

Abstract

We propose using nonlinear Mach-Zehnder interferometer (NMZI) to efficiently prepare photonic quantum states from a classical input. We first analytically investigate the simple NMZI that can filtrate single photon state from weak coherent state by preferrentially blocking two-photon component. As a generalization, we show that the cascaded NMZI can deterministically extract arbitrary quantum state from a strong coherent state. Finally, we numerically demonstrate that the cascaded NMZI can be very efficient in both the input power and the level of cascade. The protocol of quantum state preparation with NMZI can be extended to various systems of bosonic modes.