Entangled-pulse generation inside coherent Ising machines using entanglement swapping

ORAL

Abstract

Coherent Ising machines (CIMs) have been proposed and demonstrated as heuristic solvers of hard combinatorial optimization problems. In current measurement-feedback-based CIMs (P.L. McMahon 2016), interactions between pulses (spins) are mediated via a classical feedback mechanism, and consequently no entanglement among pulses is generated. In this research, we investigate the use of entanglement swapping to introduce inter-pulse entanglement into such CIM-like architectures, using an external source of independently squeezed pulses. We develop models to describe the resulting intracavity dynamics as a function of system parameters, which can be numerically simulated to characterize the quantum noise and correlations in the pulse train. We also introduce and employ several measures of inseparability to quantify the nonclassical correlations that are realized. Analyzing these measures reveal trade-offs between system parameters and produce metrics useful for optimizing them. We present the requirements necessary to realize experimentally desirable levels of non-classical correlations.

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Presenters

  • Ryotatsu Yanagimoto

    Stanford University

Authors

  • Ryotatsu Yanagimoto

    Stanford University

  • Peter McMahon

    Stanford University, E. L. Ginzton Laboratory, Stanford University

  • Tatsuhiro Onodera

    Stanford University, E. L. Ginzton Laboratory, Stanford University

  • Edwin Ng

    Stanford University, E. L. Ginzton Laboratory, Stanford University

  • Hideo Mabuchi

    Stanford University, E. L. Ginzton Laboratory, Stanford University, Ginzton Laboratory, Stanford University