Hybrid quantum variational algorithm for simulating open quantum systems with near-term devices

• Published in: Journal of physics. A, Mathematical and theoretical Vol. 53; no. 41; pp. 415301 - 415313
• Main Authors: Mahdian, Mahmoud, Yeganeh, H Davoodi
• Format: Journal Article
• Language: English
• Published: IOP Publishing 16.10.2020
• Subjects: hybrid quantum-classical algorithm; near-term devices; open quantum system; time-dependent variational principle
• ISSN: 1751-8113; 1751-8121
• DOI: 10.1088/1751-8121/abad76

Hybrid quantum-classical (HQC) algorithms make it possible to use near-term quantum devices supported by classical computational resources by useful control schemes. In this paper, we develop an HQC algorithm using an efficient variational optimization approach to simulate open system dynamics under the Noisy-Intermediate Scale Quantum computer. Using the time-dependent variational principle (TDVP) method and extending it to McLachlan TDVP for density matrix which involves minimization of Frobenius norm of the error, we apply the unitary quantum circuit to obtain the time evolution of the open quantum system in the Lindblad formalism. Finally, we illustrate the use of our methods with detailed examples which are in good agreement with analytical calculations.