Overhead-constrained circuit knitting for variational quantum dynamics
Simulating the dynamics of large quantum systems is a formidable yet vital pursuit for obtaining a deeper understanding of quantum mechanical phenomena. While quantum computers hold great promise for speeding up such simulations, their practical application remains hindered by limited scale and perv...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften
2024-03-01
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| Series: | Quantum |
| Online Access: | https://quantum-journal.org/papers/q-2024-03-21-1296/pdf/ |
| _version_ | 1797253638375079936 |
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| author | Gian Gentinetta Friederike Metz Giuseppe Carleo |
| author_facet | Gian Gentinetta Friederike Metz Giuseppe Carleo |
| author_sort | Gian Gentinetta |
| collection | DOAJ |
| description | Simulating the dynamics of large quantum systems is a formidable yet vital pursuit for obtaining a deeper understanding of quantum mechanical phenomena. While quantum computers hold great promise for speeding up such simulations, their practical application remains hindered by limited scale and pervasive noise. In this work, we propose an approach that addresses these challenges by employing circuit knitting to partition a large quantum system into smaller subsystems that can each be simulated on a separate device. The evolution of the system is governed by the projected variational quantum dynamics (PVQD) algorithm, supplemented with constraints on the parameters of the variational quantum circuit, ensuring that the sampling overhead imposed by the circuit knitting scheme remains controllable. We test our method on quantum spin systems with multiple weakly entangled blocks each consisting of strongly correlated spins, where we are able to accurately simulate the dynamics while keeping the sampling overhead manageable. Further, we show that the same method can be used to reduce the circuit depth by cutting long-ranged gates. |
| first_indexed | 2024-04-24T21:37:14Z |
| format | Article |
| id | doaj.art-4b2094f4168d4b438e3b3569649f93e8 |
| institution | Directory Open Access Journal |
| issn | 2521-327X |
| language | English |
| last_indexed | 2024-04-24T21:37:14Z |
| publishDate | 2024-03-01 |
| publisher | Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften |
| record_format | Article |
| series | Quantum |
| spelling | doaj.art-4b2094f4168d4b438e3b3569649f93e82024-03-21T17:13:34ZengVerein zur Förderung des Open Access Publizierens in den QuantenwissenschaftenQuantum2521-327X2024-03-018129610.22331/q-2024-03-21-129610.22331/q-2024-03-21-1296Overhead-constrained circuit knitting for variational quantum dynamicsGian GentinettaFriederike MetzGiuseppe CarleoSimulating the dynamics of large quantum systems is a formidable yet vital pursuit for obtaining a deeper understanding of quantum mechanical phenomena. While quantum computers hold great promise for speeding up such simulations, their practical application remains hindered by limited scale and pervasive noise. In this work, we propose an approach that addresses these challenges by employing circuit knitting to partition a large quantum system into smaller subsystems that can each be simulated on a separate device. The evolution of the system is governed by the projected variational quantum dynamics (PVQD) algorithm, supplemented with constraints on the parameters of the variational quantum circuit, ensuring that the sampling overhead imposed by the circuit knitting scheme remains controllable. We test our method on quantum spin systems with multiple weakly entangled blocks each consisting of strongly correlated spins, where we are able to accurately simulate the dynamics while keeping the sampling overhead manageable. Further, we show that the same method can be used to reduce the circuit depth by cutting long-ranged gates.https://quantum-journal.org/papers/q-2024-03-21-1296/pdf/ |
| spellingShingle | Gian Gentinetta Friederike Metz Giuseppe Carleo Overhead-constrained circuit knitting for variational quantum dynamics Quantum |
| title | Overhead-constrained circuit knitting for variational quantum dynamics |
| title_full | Overhead-constrained circuit knitting for variational quantum dynamics |
| title_fullStr | Overhead-constrained circuit knitting for variational quantum dynamics |
| title_full_unstemmed | Overhead-constrained circuit knitting for variational quantum dynamics |
| title_short | Overhead-constrained circuit knitting for variational quantum dynamics |
| title_sort | overhead constrained circuit knitting for variational quantum dynamics |
| url | https://quantum-journal.org/papers/q-2024-03-21-1296/pdf/ |
| work_keys_str_mv | AT giangentinetta overheadconstrainedcircuitknittingforvariationalquantumdynamics AT friederikemetz overheadconstrainedcircuitknittingforvariationalquantumdynamics AT giuseppecarleo overheadconstrainedcircuitknittingforvariationalquantumdynamics |