Gate-Efficient Simulation of Molecular Eigenstates on a Quantum Computer
| Autor: | Pauline J. Ollitrault, Marc Ganzhorn, Panagiotis Kl. Barkoutsos, Daniel J. Egger, Stefan Woerner, Andreas Fuhrer, Marco Roth, Ivano Tavernelli, Stefan Filipp, Gian Salis, Nikolaj Moll, P. Mueller |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Quantum Physics
Coherence time Computer science FOS: Physical sciences General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Quantum chemistry Computational science Computer Science::Hardware Architecture Computer Science::Emerging Technologies Excited state 0103 physical sciences Quantum algorithm Computational problem Quantum Physics (quant-ph) 010306 general physics 0210 nano-technology Quantum Eigenvalues and eigenvectors Quantum computer |
| Zdroj: | Physical Review Applied. 11 |
| ISSN: | 2331-7019 |
| DOI: | 10.1103/physrevapplied.11.044092 |
| Popis: | A key requirement to perform simulations of large quantum systems on near-term quantum hardware is the design of quantum algorithms with short circuit depth that finish within the available coherence time. A way to stay within the limits of coherence is to reduce the number of gates by implementing a gate set that matches the requirements of the specific algorithm of interest directly in hardware. Here, we show that exchange-type gates are a promising choice for simulating molecular eigenstates on near-term quantum devices since these gates preserve the number of excitations in the system. Complementing the theoretical work by Barkoutsos et al. [PRA 98, 022322 (2018)], we report on the experimental implementation of a variational algorithm on a superconducting qubit platform to compute the eigenstate energies of molecular hydrogen. We utilize a parametrically driven tunable coupler to realize exchange-type gates that are configurable in amplitude and phase on two fixed-frequency superconducting qubits. With gate fidelities around 95% we are able to compute the eigenstates within an accuracy of 50 mHartree on average, a limit set by the coherence time of the tunable coupler. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|