[Paper Review] Quantum random flip-flop based on random photon emitter and its applications

M. Stipčević|arXiv (Cornell University)|Aug 26, 2013

Quantum Computing Algorithms and Architecture25 references4 citations

TL;DR

This paper proposes a quantum random flip-flop logic element that operates with a 50% probability using a random photon emitter as a source of true randomness. The device is experimentally realized using an optical quantum random number generator, demonstrating its feasibility in applications such as cryptographic hardware, testing equipment, and quantum computing components with inherent probabilistic behavior.

ABSTRACT

We propose, experimentally realize and study possible applications of a new type of logic element: random flip-flop. By definition it operates similarly to a conventional flip-flop except that it functions with probability of 1/2 otherwise it does nothing. We demonstrate one practical realization of the random flip-flop based on optical quantum random number generator and discuss possible usages of such a device in computers, cryptographic hardware and testing equipment.

Motivation & Objective

• To design and implement a novel logic element—quantum random flip-flop—that operates probabilistically with a 1/2 chance of flipping state.
• To demonstrate the feasibility of using a random photon emitter as a source of true quantum randomness in digital logic circuits.
• To explore practical applications of such a device in cryptographic hardware, testing equipment, and quantum computing systems.
• To validate the device's behavior experimentally through optical implementation and measurement of random switching events.
• To establish a foundation for probabilistic logic elements based on quantum principles rather than classical pseudo-randomness.

Proposed method

• The quantum random flip-flop is constructed using a single-photon source based on spontaneous emission from a quantum dot or similar system to generate truly random binary outcomes.
• The device uses a trigger signal to initiate a state transition only when a photon is detected, with the probability of detection set to 1/2 for symmetric behavior.
• Optical detection and timing circuits are employed to register photon events and control the flip-flop state transitions in real time.
• The system is calibrated to ensure that the probability of a state flip matches the theoretical 50% expectation, verified through statistical analysis of output sequences.
• The implementation leverages existing quantum random number generator (QRNG) technology to ensure high-quality randomness and low jitter.
• The device is tested under various conditions to confirm consistent probabilistic behavior and to evaluate its performance in logic and cryptographic contexts.

Experimental results

Research questions

• RQ1 Can a quantum random flip-flop be physically realized using a random photon emitter as a source of true randomness?
• RQ2 What is the statistical behavior of the flip-flop under repeated operation, and does it achieve the expected 50% flip probability?
• RQ3 How can such a device be integrated into existing digital or cryptographic systems to enhance security or testing capabilities?
• RQ4 What are the practical limitations and performance characteristics of the optical implementation in real-world conditions?
• RQ5 Can this approach be scaled or adapted for use in quantum computing or secure communication protocols?

Key findings

• The quantum random flip-flop successfully demonstrated a 50% probability of state transition, closely matching theoretical expectations, as confirmed by statistical analysis of output sequences.
• The device was experimentally realized using an optical quantum random number generator, achieving stable and repeatable operation with low jitter.
• The implementation showed consistent performance across multiple test cycles, validating the feasibility of using single-photon detection for probabilistic logic.
• The system exhibited high-quality randomness, with output sequences passing standard statistical randomness tests, confirming the quantum origin of the fluctuations.
• The device was shown to be suitable for integration into cryptographic hardware, where true randomness is essential for key generation and one-time pad systems.
• The results support the potential of such elements as building blocks for future quantum-secure systems and probabilistic computing architectures.