Preparation of excited states for nuclear dynamics on a quantum computer [electronic resource]
Saved in:
| Online Access: |
Full Text (via OSTI) |
|---|---|
| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2020.
|
| Subjects: |
| Abstract: | Here, we study two different methods to prepare excited states on a quantum computer, a key initial step to study dynamics within linear response theory. The first method uses unitary evolution for a short time T = O(?1 - F) to approximate the action of an excitation operator Ô with fidelity F and success probability P ? 1 ? F. The second method probabilistically applies the excitation operator using the Linear Combination of Unitaries (LCU) algorithm. We benchmark these techniques on emulated and real quantum devices, using a toy model for thermal neutron-proton capture. Despite its larger memory footprint, the LCU-based method is efficient even on current generation noisy devices and can be implemented at a lower gate cost than a naive analysis would suggest. These findings show that quantum techniques designed to achieve good asymptotic scaling on fault tolerant quantum devices might also provide practical benefits on devices with limited connectivity and gate fidelity. |
|---|---|
| Item Description: | Published through Scitech Connect. 12/28/2020. "LA-UR-20-27411." "Journal ID: ISSN 2469-9985." "Other: FG02-00ER41132, SC0019478, SC0018223, AC52-06NA25396." ": US2205687." Roggero, Alessandro ; Gu, Chenyi ; Baroni, Alessandro ; Papenbrock, Thomas ; Univ. of Tennessee, Knoxville, TN (United States) |
| Physical Description: | Size: Article No. 064624 : digital, PDF file. |