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Magnetic tunnel junction as a real-time entropy source: Field-Programmable Gate Array based random bit generation without post-processing
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DOI：10.1063/5.0308636.png)
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Abstract
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We demonstrate a method to generate application-ready truly random bits from a magnetic tunnel junction driven by a Field-Programmable Gate Array (FPGA). We implement a real-time feedback loop that stabilizes the switching probability near 50% and apply an XOR operation, both on the FPGA, to suppress short-term correlations, together mitigating long-term drift and bias in the bitstream. This combined approach passes the NIST Statistical Test Suite for random bit generation at 5 Mb/s without post-processing, providing a practical hardware solution for fast and reliable true random number generation. Beyond cryptographic applications, these capabilities open opportunities for stochastic hardware accelerators, probabilistic computing, and large-scale modeling where real-time access to unbiased randomness is essential.
Keywords:
Magnetic tunnel junction
True random number generation
Field-Programmable Gate Array
Random bit generation
Entropy source