Programmable time-multiplexed squeezed light source

TL;DR

This paper presents a programmable, software-controlled time-multiplexed squeezed light source capable of producing sequential pulses with variable squeezing levels and phases at high speed, advancing large-scale continuous-variable quantum information processing.

Contribution

The authors develop a flexible, programmable squeezed light source using a waveguide optical parametric amplifier and pump modulation, enabling arbitrary pulse patterns without hardware changes.

Findings

Successfully generated variable squeezing levels and phases

Achieved pulse timing below 100 ns

Demonstrated software-controlled arbitrary pattern generation

Abstract

One of the leading approaches to large-scale quantum information processing (QIP) is the continuous-variable (CV) scheme based on time multiplexing (TM). As a fundamental building block for this approach, quantum light sources to sequentially produce time-multiplexed squeezed-light pulses are required; however, conventional CV TM experiments have used fixed light sources that can only output the squeezed pulses with the same squeezing levels and phases. We here demonstrate a programmable time-multiplexed squeezed light source that can generate sequential squeezed pulses with various squeezing levels and phases at a time interval below 100 ns. The generation pattern can be arbitrarily chosen by software without changing its hardware configuration. This is enabled by using a waveguide optical parametric amplifier and modulating its continuous pump light. Our light source will implement various large-scale CV QIP tasks.