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Single-System-Based Generation of Certified Randomness Using Leggett-Garg Inequality
Pingal Pratyush Nath1, Debashis Saha2, Dipankar Home3
1<a href="https://ror.org/04dese585">Indian Institute of Science</a>, C. V. Raman Road, Bengaluru, Karnataka 560012, India.
We demonstrate a secure quantum random number generator using Leggett-Garg inequality violations. This method generates over 919,000 truly unpredictable bits per second, enhancing secure communication.
Area of Science:
- Quantum Information Science
- Quantum Cryptography
- Foundations of Quantum Mechanics
Background:
- Quantum random number generation (QRNG) is crucial for secure communications.
- Existing QRNG protocols often require trusted devices or complex setups.
- Semi-device-independent (SDI) protocols offer enhanced security by reducing device trust.
Purpose of the Study:
- To develop and experimentally demonstrate a secure semi-device-independent quantum random number generation (SDI-QRNG) scheme.
- To utilize Leggett-Garg inequality (LGI) violations for robust randomness quantification.
- To establish a loophole-free experimental platform for practical QRNG.
Main Methods:
- Theoretical formulation of an SDI-QRNG protocol based on LGI violations.
- Experimental implementation using a loophole-free photonic architecture.
- Rigorous estimation of randomness quality using analytical and numerical methods.
Main Results:
- Successful demonstration of a secure SDI-QRNG scheme.
- Generation of 919,118 truly unpredictable random bits.
- Achieved a high generation rate of 3865 bits/sec.
- Analytical and numerical randomness estimations showed perfect agreement.
Conclusions:
- The study presents a novel and secure method for QRNG.
- The loophole-free photonic architecture ensures high security and reliability.
- This work paves the way for practical and empirically convenient quantum random number generators.
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