We present a new scheme to efficiently establish entanglement between optical modes in a time-multiplexed coherent Ising machine (CIM) by means of nonlocal measurement and feedback. We numerically simulate and evaluate the generation of steady-state entanglement in a system with nearest-neighbor interactions on a 1D ring, and we compare the results to those of a conventional CIM with all-optical interactions mediated by delay lines. We show that the delay-line architecture has a fundamental limit on accessible entanglement that our measurement-based scheme can substantially surpass. These results motivate the study of non-classical correlations in CIMs with levels of entanglement previously considered to be experimentally impractical.
@article{arxiv.1906.04902,
title = {Embedding entanglement generation within a measurement-feedback coherent Ising machine},
author = {Ryotatsu Yanagimoto and Peter L. McMahon and Edwin Ng and Tatsuhiro Onodera and Hideo Mabuchi},
journal= {arXiv preprint arXiv:1906.04902},
year = {2019}
}