Qubit coupled cluster singles and doubles variational quantum eigensolver ansatz for electronic structure calculations
Variational quantum eigensolver (VQE) for electronic structure calculations is believed to be one major potential application of near term quantum computing. Among all proposed VQE algorithms, the unitary coupled cluster singles and doubles excitations (UCCSD) VQE ansatz has achieved high accuracy and received a lot of research interest. However, the UCCSD VQE based on fermionic excitations needs extra terms for the parity when using Jordan–Wigner transformation. Here we introduce a new VQE ansatz based on the particle preserving exchange gate to achieve qubit excitations. The proposed VQE ansatz has gate complexity up-bounded toO(n4) for all-to-all connectivity wherenis the number of qubits of the Hamiltonian. Numerical results of simple molecular systems such as BeH2, H2O, N2, H4and H6using the proposed VQE ansatz gives very accurate results within errors about 10-3Hartree.
- Research Organization:
- Purdue Univ., West Lafayette, IN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- SC0019215
- OSTI ID:
- 1852940
- Journal Information:
- Quantum Science and Technology, Vol. 6, Issue 1; ISSN 2058-9565
- Publisher:
- IOPscience
- Country of Publication:
- United States
- Language:
- English
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