Experimental Low-Latency Device-Independent Quantum Randomness.

Area of Science:

• Quantum Information Science
• Cryptography
• Experimental Physics

Background:

• Secure applications like private key generation and public randomness beacons rely on certified random bits.
• Existing device-independent quantum random number generators (DI-QRNGs) are too slow for on-demand applications due to high latency in quantum-proof protocols.
• Loophole-free experimental implementations of DI-QRNGs require extensive time to generate random bits.

Purpose of the Study:

• To develop a more efficient quantum-proof protocol for device-independent quantum randomness generation.
• To demonstrate the generation of certified random bits with significantly reduced latency compared to existing methods.
• To enable practical, on-demand generation of high-quality random numbers for cryptographic applications.

Main Methods:

• Implementation of a loophole-free Bell test to certify quantum randomness.
• Development and application of a novel, more efficient quantum-proof protocol.
• Experimental generation of multiple blocks of 512 certified random bits.

Main Results:

• Achieved an average experiment time of less than 5 minutes per block of random bits.
• Generated multiple blocks of 512 random bits, a significant improvement in speed.
• Maintained a certified error rate bounded by 2^{-64} (approximately 5.42×10^{-20}), ensuring high quality.

Conclusions:

• The demonstrated method significantly accelerates device-independent quantum randomness generation.
• This advancement makes quantum randomness generation practical for on-demand applications.
• The protocol offers a viable solution for generating secure random bits for cryptography and other applications.