CaRBM: A Fixed-Depth Quantum Algorithm with Partial Correction for Thermal State Preparation
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910064938319872 |
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| author | Alsheikh, Omar Kemper, A. F. Rrapaj, Ermal Rule, Evan J. Toga, Goksu C. |
| author_facet | Alsheikh, Omar Kemper, A. F. Rrapaj, Ermal Rule, Evan J. Toga, Goksu C. |
| contents | We introduce the CaRBM algorithm for fixed-depth thermal state preparation. Our algorithm is based on thermal state purification and uses the Restricted Boltzmann Machine (RBM) block-encoding scheme to implement the imaginary-time propagator $e^{-βH}$, which is implemented in the quantum circuit in a fixed-depth manner via Cartan decomposition. Our algorithm performs best at high temperatures, with the success probability of the block encoding decreasing as the temperature decreases. To increase the success probability, we have devised a correction scheme for the block-encoding that increases the temperature range our algorithm reliably probes. We demonstrate our algorithm by calculating the partition function zeros of the XXZ model and the phase diagram of the Gross-Neveu model, which is a model of strongly interacting relativistic fermions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_17971 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | CaRBM: A Fixed-Depth Quantum Algorithm with Partial Correction for Thermal State Preparation Alsheikh, Omar Kemper, A. F. Rrapaj, Ermal Rule, Evan J. Toga, Goksu C. Quantum Physics Statistical Mechanics High Energy Physics - Lattice We introduce the CaRBM algorithm for fixed-depth thermal state preparation. Our algorithm is based on thermal state purification and uses the Restricted Boltzmann Machine (RBM) block-encoding scheme to implement the imaginary-time propagator $e^{-βH}$, which is implemented in the quantum circuit in a fixed-depth manner via Cartan decomposition. Our algorithm performs best at high temperatures, with the success probability of the block encoding decreasing as the temperature decreases. To increase the success probability, we have devised a correction scheme for the block-encoding that increases the temperature range our algorithm reliably probes. We demonstrate our algorithm by calculating the partition function zeros of the XXZ model and the phase diagram of the Gross-Neveu model, which is a model of strongly interacting relativistic fermions. |
| title | CaRBM: A Fixed-Depth Quantum Algorithm with Partial Correction for Thermal State Preparation |
| topic | Quantum Physics Statistical Mechanics High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2603.17971 |