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Single Photon Randomness based on a Defect Center in Diamond.

Xing Chen¹, Johannes N Greiner¹, Jörg Wrachtrup^1,2

¹3rd Institute of Physics, University of Stuttgart and Institute for Quantum Science and Technology (IQST), Pfaffenwaldring 57, D-70569, Stuttgart, Germany.

Scientific Reports

|December 6, 2019

Summary

This study demonstrates a quantum random number generator using single photons from a diamond defect center. The device offers stable, 24/7 operation for generating true random bits, crucial for secure applications.

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Area of Science:

Quantum Physics
Photonics
Solid-State Physics

Background:

Quantum random number generators (QRNGs) leverage quantum phenomena for true randomness.
Single photons interacting with beam splitters are a common QRNG implementation.
Diamond defect centers offer stable, single-photon sources suitable for quantum technologies.

Purpose of the Study:

To implement and characterize a QRNG using single photons from a diamond defect center.
To certify the quantum nature of the photon source and assess generator performance.
To investigate and mitigate technical limitations for reliable, continuous operation.

Main Methods:

Utilized single photons from a diamond defect center (NV-center).
Employed anti-bunching measurements to verify single-photon emission and quantumness.
Implemented a beam splitter setup with single-photon detectors for bit generation.
Analyzed technical limitations and proposed suppression methods, including a priori entropy estimation.

Main Results:

Successfully implemented a QRNG based on single photons from a diamond NV-center.
Certified the quantum nature of the source and quantified background fraction.
Demonstrated stable, 24/7 operation of the QRNG under ambient conditions.
Identified and discussed methods to overcome technical limitations like intensity fluctuations and bias.

Conclusions:

Diamond defect centers are suitable sources for stable, high-quality quantum random number generation.
The implemented QRNG provides a reliable source of true random bits with potential for secure applications.
Continuous, ambient condition operation is achievable, paving the way for practical QRNG deployment.