Entangling the optical frequency comb: simultaneous generation of multiple 2x2 and 2x3 continuous-variable cluster states in a single optical parametric oscillator

TL;DR

This paper demonstrates that a single optical parametric oscillator can generate multiple independent continuous-variable cluster states across a frequency comb, significantly reducing resource requirements for large-scale quantum entanglement.

Contribution

It introduces a method to entangle a frequency comb into multiple cluster states using minimal optical pumping, advancing scalable quantum information processing.

Findings

Multiple 2x2 and 2x3 cluster states generated simultaneously

Efficient entanglement of large-scale optical frequency combs

Reduced resource requirements for multipartite entanglement

Abstract

We report on our research effort to generate large-scale multipartite optical-mode entanglement using as few physical resources as possible. We have previously shown that cluster- and GHZ-type N-partite continuous-variable entanglement can be obtained in an optical resonator that contains a suitably designed second-order nonlinear optical medium, pumped by at most O(N^2) fields. In this paper, we show that the frequency comb of such a resonator can be entangled into an arbitrary number of independent 2x2 and 2x3 continuous-variable cluster states by a single optical parametric oscillator pumped by just a few optical modes.