Variational ansatz-based quantum simulation of imaginary time evolution
University of Oxford · China Academy of Engineering Physics
Abstract
Abstract Imaginary time evolution is a powerful tool for studying quantum systems. While it is possible to simulate with a classical computer, the time and memory requirements generally scale exponentially with the system size. Conversely, quantum computers can efficiently simulate quantum systems, but not non-unitary imaginary time evolution. We propose a variational algorithm for simulating imaginary time evolution on a hybrid quantum computer. We use this algorithm to find the ground-state energy of many-particle systems; specifically molecular hydrogen and lithium hydride, finding the ground state with high probability. Our method can also be applied to general optimisation problems and quantum machine…
Citation impact
- FWCI
- 31.92
- Percentile
- 100%
- References
- 52
Authors
6Topics & keywords
- Quantum computer
- Quantum simulator
- Quantum algorithm
- Imaginary time
- Computer science
- Quantum
- Quantum phase estimation algorithm
- Ansatz