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Allerton Conference on Communication, Control, and Computing

Solving the B-SAT Problem Using Quantum Computing: Smaller is Sometimes Better

Ahmad Bennakhi, Gregory T. Byrd, Paul D. Franzon

Published Sep 24, 2024• 0 citations
Publisher

Abstract

This paper examines the effectiveness of modern universal gate quantum computers in solving the Boolean Satisfiability (B-SAT) problem using Grover's Search algorithm. Experiments were conducted with varying configurations, including the number of shots, qubit mapping, and different quantum processors, to assess their impact on the results. The study also includes an experiment that highlights a unique behavior observed in IBM quantum processors when running circuits with a specific number of shots.

DOI
10.1109/allerton63246.2024.10735285

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This paper examines the effectiveness of modern universal gate quantum computers in solving the Boolean Satisfiability (B-SAT) problem using Grover's Search algorithm. Experiments were conducted with varying configurations, including the number of shots, qubit mapping, and different quantum processors, to assess their impact on the results. The study also includes an experiment that highlights a unique behavior observed in IBM quantum processors when running circuits with a specific number of shots.
This paper aims to outline the effectiveness of modern universal gate quantum computers when utilizing different configurations to solve the B-SAT (Boolean satisfiability) problem. The quantum computing experiments were performed using Grover's search algorithm to find a valid solution. The experiments were performed under different variations to demonstrate their effects on the results. Changing the number of shots, qubit mapping, and using a different quantum processor were all among the experimental variables. The study also branched into a dedicated experiment highlighting a peculiar behavior that IBM quantum processors exhibit when running circuits with a certain number of shots.
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This study explores how well Grover's Algorithm performs in solving the Boolean Satisfiability Problem (SAT) using quantum circuits. The algorithm is implemented with IBM's Qiskit framework and compared to classical brute-force methods. Experiments focus on 3-SAT, 4-SAT, and 5-SAT problems, using quantum simulators and IBM quantum hardware. The results show that Grover's Algorithm is more efficient, offering a theoretical quadratic speedup over classical methods. However, practical issues like limited qubit availability, hardware noise, and optimization challenges impact its current performance. The data highlights the potential for quantum computing to scale and solve NP-complete problems. This research shows how quantum computing can improve problem-solving and lays the groundwork for future studies on more complex SAT problems and advanced quantum hardware.
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Constraint satisfiability problems, crucial to several applications, are solved on a quantum computer using the Grover's search algorithm, leading to a quadratic improvement over the classical case. The solutions are obtained with high probability for several cases and are illustrated for the cases involving 2 variables for both 3-bit and 4-bit numbers. Methods are defined for inequality comparisons and these are combined according to the form of the satisfiability formula, to form the oracle for the algorithm. The circuit is constructed using IBM Qiskit and is verified on an IBM simulator. It is further executed on one of the Noisy Intermediate-Scale Quantum (NISQ) processors from IBM on the cloud. Noise levels in the processor at present are found to be too high for successful execution. Running the algorithm on the simulator with a custom noise model lets us identify the noise threshold for successful execution.
Satisfiability (SAT) is a central problem in computer science, and advances in SAT-solving algorithms have a far-reaching impact across many fields. Recent works have proposed quantum SAT solvers based on Grover's algorithm, a quantum search technique. However, Grover-based approaches face a key limitation: they typically require prior knowledge of the number of satisfying assignments of the target Boolean formula. This information is unavailable in most practical settings. Quantum counting can be used to estimate this quantity, but it incurs a computational overhead that is several orders of magnitude higher than Grover search. In this paper, we propose a novel quantum SAT solver based on entanglement and equivalence checking. Our method does not assume prior knowledge of the number of solutions and is computationally more efficient than quantum counting. Although the worst case time complexity is inevitably exponential, we prove that the expected time complexity of our approach is only constant time O(1) over random Boolean functions. Experimental results also support our theoretical claim.