Resource-Efficient Hybrid Quantum-Classical Simulation Algorithm
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866916646062391296 |
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| author | Chee, Chong Hian Leykam, Daniel Mak, Adrian M. Bharti, Kishor Angelakis, Dimitris G. |
| author_facet | Chee, Chong Hian Leykam, Daniel Mak, Adrian M. Bharti, Kishor Angelakis, Dimitris G. |
| contents | Digital quantum computers promise exponential speedups in performing quantum time-evolution, providing an opportunity to simulate quantum dynamics of complex systems in physics and chemistry. However, the task of extracting desired quantum properties at intermediate time steps remains a computational bottleneck due to wavefunction collapse and no-fast-forwarding theorem. Despite significant progress towards building a Fault-Tolerant Quantum Computer (FTQC), there is still a need for resource-efficient quantum simulators. Here, we propose a hybrid simulator that enables classical computers to leverage FTQC devices and quantum time propagators to overcome this bottleneck, so as to efficiently simulate the quantum dynamics of large systems initialized in an unknown superposition of a few system eigenstates. It features no optimization subroutines and avoids barren plateau issues, while consuming fewer quantum resources compared to standard methods when many time steps are required. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_10528 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Resource-Efficient Hybrid Quantum-Classical Simulation Algorithm Chee, Chong Hian Leykam, Daniel Mak, Adrian M. Bharti, Kishor Angelakis, Dimitris G. Quantum Physics Digital quantum computers promise exponential speedups in performing quantum time-evolution, providing an opportunity to simulate quantum dynamics of complex systems in physics and chemistry. However, the task of extracting desired quantum properties at intermediate time steps remains a computational bottleneck due to wavefunction collapse and no-fast-forwarding theorem. Despite significant progress towards building a Fault-Tolerant Quantum Computer (FTQC), there is still a need for resource-efficient quantum simulators. Here, we propose a hybrid simulator that enables classical computers to leverage FTQC devices and quantum time propagators to overcome this bottleneck, so as to efficiently simulate the quantum dynamics of large systems initialized in an unknown superposition of a few system eigenstates. It features no optimization subroutines and avoids barren plateau issues, while consuming fewer quantum resources compared to standard methods when many time steps are required. |
| title | Resource-Efficient Hybrid Quantum-Classical Simulation Algorithm |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2405.10528 |