Fast Quantum Many Body State Synthesis
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917084927098880 |
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| author | Tiwari, Prashasti Lewis, Dylan Bose, Sougato |
| author_facet | Tiwari, Prashasti Lewis, Dylan Bose, Sougato |
| contents | Quantum Mechanical ground states of many-body systems can be important resources for various investigations: for quantum sensing, as the initial state for nonequilibrium quantum dynamics following quenches, and the simulation of quantum processes that start by coupling systems in ground states, eg, could be a process in quantum chemistry. However, to prepare ground states can be challenging; for example, requires adiabatic switching of Hamiltonian terms slower than an inverse gap, which can be time consuming and bring in decoherence. Here we investigate the possibility of preparing a many-body entangled ground state of a certain Hamiltonian, which can be called a quantum ``problem'' Hamiltonian, using the time evolution of an initial fiducial state by another ``solver'' Hamiltonian/s for a very short fixed (unit) time. The parameters of the solver Hamiltonian are optimised classically using energy minimisation as the cost function. We present a study of up to n=10 qubit many-body states prepared using this methodology. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_12923 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fast Quantum Many Body State Synthesis Tiwari, Prashasti Lewis, Dylan Bose, Sougato Quantum Physics Quantum Mechanical ground states of many-body systems can be important resources for various investigations: for quantum sensing, as the initial state for nonequilibrium quantum dynamics following quenches, and the simulation of quantum processes that start by coupling systems in ground states, eg, could be a process in quantum chemistry. However, to prepare ground states can be challenging; for example, requires adiabatic switching of Hamiltonian terms slower than an inverse gap, which can be time consuming and bring in decoherence. Here we investigate the possibility of preparing a many-body entangled ground state of a certain Hamiltonian, which can be called a quantum ``problem'' Hamiltonian, using the time evolution of an initial fiducial state by another ``solver'' Hamiltonian/s for a very short fixed (unit) time. The parameters of the solver Hamiltonian are optimised classically using energy minimisation as the cost function. We present a study of up to n=10 qubit many-body states prepared using this methodology. |
| title | Fast Quantum Many Body State Synthesis |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2511.12923 |