Generation of large-scale continuous-variable cluster states multiplexed both in time and frequency domains

TL;DR

This paper presents a method to generate large-scale continuous-variable cluster states multiplexed in both time and frequency domains, enabling scalable quantum computing resources with potential for ultra-large 3D cluster states.

Contribution

The authors propose a novel scheme to generate large-scale dual-rail CV cluster states multiplexed in time and frequency, extendable to 3D, with a high number of parallel arrays and large partite numbers.

Findings

Parallel arrays depend on frequency comb lines

Partite number per array can reach millions

Scale of 3D cluster state can be ultra-large

Abstract

Large-scale continuous variable (CV) cluster state is necessary in quantum information processing based on measurement-based quantum computing (MBQC). Specially, generating large-scale CV cluster state multiplexed in time domain is easier to implement and has strong scalability in experiment. Here one-dimensional (1D) large-scale dual-rail CV cluster states multiplexed both in time and frequency domains are parallelly generated, which can be further extended to three-dimensional (3D) CV cluster state by combining two time-delay NOPA systems with beamsplitters. It is shown that the number of parallel arrays depends on the corresponding frequency comb lines and the partite number of each array can be very large (million), and scale of the 3D cluster state can be ultra-large. This scheme provides some special-structured CV cluster states, which will be valuable for quantum computing of hybrid domains.