Quantum computing of the pairing Hamiltonian at finite temperatures

• URL: http://arxiv.org/abs/2212.08862v1
• Date: Sat, 17 Dec 2022 12:59:22 GMT
• Title: Quantum computing of the pairing Hamiltonian at finite temperatures
• Authors: Chongji Jiang and Junchen Pei
• Abstract summary: We study the pairing hamiltonian with four particles at finite temperatures on a quantum simulator and a superconducting quantum computer. The excited states are obtained by the variational quantum deflation (VQD)
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Thermal excitations of finite quantum systems are interesting due to the absent of phase transitions and the breakdown of the BCS theory. In this work, we study the pairing hamiltonian with four particles at finite temperatures on a quantum simulator and a superconducting quantum computer. The excited states are obtained by the variational quantum deflation (VQD). The error-mitigation methods are applied to improve the noisy results. The simulation of thermal excitations is performed with the same circuits at zero temperature, which shows a smooth transition as a function of temperatures in contrast to a false phase transition by the finite-temperature BCS (FT-BCS) method.

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