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Design Automation Challenges and Benefits of Dynamic Quantum Circuit in Present NISQ Era and Beyond

Abhoy Kole; Kamalika Datta; Rolf Drechsler
In: International Workshop on Quantum Computing: Circuits Systems Automation and Applications. IEEE Computer Society Annual Symposium on VLSI (ISVLSI-2024), July 1-3, Knoxville, USA, 2024.


Over the last two decades there has been immense progress in the field of quantum computing. Although today we have demonstrable quantum computers with more than 1000 qubits, researchers are still trying to show how these machines can be utilized to get substantial benefit for certain applications. We are also in the Noisy Intermediate Scale Quantum (NISQ) era that imposes certain restrictions in utilizing the entire physical qubit space. Implementation of various large-scale quantum algorithms suffers from limited number of available qubits and also the qubit coupling restrictions of the target quantum processor. To this end an advanced class of quantum circuits called Dynamic Quantum Circuits (DQC) has been proposed, which can work with very few additional qubits using various non-unitary operations (viz., active reset, midcircuit measurement and classically controlled gate operations). This paper particularly presents various design automation challenges that exists in the current NISQ era and shows how DQC can be exploited to overcome some of the challenges.