Back to Search
Start Over
Purification-based quantum error mitigation of pair-correlated electron simulations
- Source :
- Nat. Phys. (2023)
- Publication Year :
- 2022
-
Abstract
- An important measure of the development of quantum computing platforms has been the simulation of increasingly complex physical systems. Prior to fault-tolerant quantum computing, robust error mitigation strategies are necessary to continue this growth. Here, we study physical simulation within the seniority-zero electron pairing subspace, which affords both a computational stepping stone to a fully correlated model, and an opportunity to validate recently introduced ``purification-based'' error-mitigation strategies. We compare the performance of error mitigation based on doubling quantum resources in time (echo verification) or in space (virtual distillation), on up to $20$ qubits of a superconducting qubit quantum processor. We observe a reduction of error by one to two orders of magnitude below less sophisticated techniques (e.g. post-selection); the gain from error mitigation is seen to increase with the system size. Employing these error mitigation strategies enables the implementation of the largest variational algorithm for a correlated chemistry system to-date. Extrapolating performance from these results allows us to estimate minimum requirements for a beyond-classical simulation of electronic structure. We find that, despite the impressive gains from purification-based error mitigation, significant hardware improvements will be required for classically intractable variational chemistry simulations.<br />Comment: 10 pages, 13 page supplementary material, 12 figures. Experimental data available at https://doi.org/10.5281/zenodo.7225821
- Subjects :
- Quantum Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Nat. Phys. (2023)
- Publication Type :
- Report
- Accession number :
- edsarx.2210.10799
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1038/s41567-023-02240-y