Phys.org August 26, 2024
An international team of researchers (USA – University of Chicago, Italy) described a solution for the eigenstate problem of mixed fermion-boson systems that could be implemented on quantum devices. Based on a generalization of the electronic contracted Schrödinger equation (CSE), they guided a trial wave function to the ground state of any arbitrary mixed Hamiltonian by directly measuring residuals of the mixed CSE on a quantum device. The accuracy of their approach was not limited by the unknown exchange-correlation functional or the uncontrolled form of the exponential assumption. To test the performance of the method, they used a commonly model used in polaritonic quantum chemistry. According to the researchers their results demonstrated that the CSE is a powerful tool in the development of quantum algorithms for solving general fermion-boson many-body problems… read more.  TECHNICAL ARTICLE
CSE and QED-CCSD energies for the three fermion Tavis-Cummings model… Credit: Phys. Rev. Lett. 133, 080202, 23 August 2024Â