Ultrafast Ising Machines using spin torque nano-oscillators

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  • Dagur Ingi Albertsson
    Division of Electronics and Embedded Systems, KTH Royal Institute of Technology 1 , 164 40 Kista, Sweden
  • Mohammad Zahedinejad
    Physics Department, University of Gothenburg 2 , 412 96 Gothenburg, Sweden
  • Afshin Houshang
    Physics Department, University of Gothenburg 2 , 412 96 Gothenburg, Sweden
  • Roman Khymyn
    Physics Department, University of Gothenburg 2 , 412 96 Gothenburg, Sweden
  • Johan Åkerman
    Physics Department, University of Gothenburg 2 , 412 96 Gothenburg, Sweden
  • Ana Rusu
    Division of Electronics and Embedded Systems, KTH Royal Institute of Technology 1 , 164 40 Kista, Sweden

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<jats:p>Combinatorial optimization problems are known for being particularly hard to solve on traditional von Neumann architectures. This has led to the development of Ising Machines (IMs) based on quantum annealers and optical and electronic oscillators, demonstrating speed-ups compared to central processing unit (CPU) and graphics processing unit (GPU) algorithms. Spin torque nano-oscillators (STNOs) have shown GHz operating frequency, nanoscale size, and nanosecond turn-on time, which would allow their use in ultrafast oscillator-based IMs. Here, we show using numerical simulations based on STNO auto-oscillator theory that STNOs exhibit fundamental characteristics needed to realize IMs, including in-phase/out-of-phase synchronization and second harmonic injection locking phase binarization. Furthermore, we demonstrate numerically that large STNO network IMs can solve Max-Cut problems on nanosecond timescales.</jats:p>

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