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A post-processing-free single-photon random number generator with ultra-low latency.

Michael A Wayne, Alan L Migdall, Zachary H Levine

|January 16, 2019

Summary

This summary is machine-generated.

This study presents a post-processing-free random number generator (RNG) for loophole-free Bell tests. The device generates random bits in under 3 nanoseconds, meeting low-latency demands for quantum experiments.

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Area of Science:

Quantum Information Science
Physical Random Number Generation

Background:

Practical loophole-free Bell tests require low-latency random number generators (RNGs).
Traditional RNGs often rely on post-processing, which is too slow for these applications.

Purpose of the Study:

To develop and demonstrate a physical RNG that operates without post-processing.
To meet the stringent timing requirements of Bell tests.

Main Methods:

Implemented a post-processing-free RNG architecture.
Utilized weak feedback control to mitigate long-term drift.
Employed Allan variance analysis to characterize RNG performance.

Main Results:

Achieved a random bit generation time of 2.4(2) nanoseconds.
Demonstrated 24-hour stable operation with output statistically indistinguishable from a Bernoulli process.
Quantified feedback impact on output predictability to be < 6.4×10^-7.

Conclusions:

The developed RNG meets the low-latency and statistical quality demands for Bell tests.
Weak feedback effectively stabilizes RNG output without compromising randomness.
Allan variance is a valuable tool for assessing RNG non-idealities.