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Evaluating Energy Differences on a Quantum Computer with Robust Phase Estimation

Physical Review Letters

Russo, Antonio R.; Rudinger, Kenneth M.; Morrison, Benjamin M.; Baczewski, Andrew D.

We adapt the robust phase estimation algorithm to the evaluation of energy differences between two eigenstates using a quantum computer. This approach does not require controlled unitaries between auxiliary and system registers or even a single auxiliary qubit. As a proof of concept, we calculate the energies of the ground state and low-lying electronic excitations of a hydrogen molecule in a minimal basis on a cloud quantum computer. The denominative robustness of our approach is then quantified in terms of a high tolerance to coherent errors in the state preparation and measurement. Conceptually, we note that all quantum phase estimation algorithms ultimately evaluate eigenvalue differences.

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TYPE Journal Article YEAR 2021
DOIOSTIScopus

Jaqal the Quantum Assembly Language for QSCOUT

Landahl, Andrew J.; Lobser, Daniel L.; Morrison, Benjamin M.; Rudinger, Kenneth M.; Russo, Antonio R.; Van Der Wall, Jay W.; Maunz, Peter L.

QSCOUT is the Quantum Scientific Computing Open User Testbed, a trapped-ion quantum computer testbed realized at Sandia National Laboratories on behalf of the Department of Energy's Office of Science and its Advanced Scientific Computing Research (ASCR) program.

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TYPE Other Report YEAR 2020
DOIOSTI
17 Results
17 Results