Quantum Circuit Optimization: Current trends and future direction

Optimization of quantum circuits for a given problem is very important in order to achieve faster calculations as well as reduce errors due to noise. Optimization has to be achieved while ensuring correctness at all times. In this survey paper, recent advancements in quantum circuit optimization are explored. Both hardware independent as well as hardware dependent optimization are presented. State-of-the-art methods for optimizing quantum circuits, including analytical algorithms, heuristic algorithms, machine learning-based algorithms, and hybrid quantum-classical algorithms are discussed. Additionally, the advantages and disadvantages of each method and the challenges associated with them are highlighted. Moreover, the potential research opportunities in this field are also discussed.