Variational Generation of Thermofield Double States and Critical Ground States with a Quantum Computer
ORAL
Abstract
Finite-temperature phases of many-body quantum systems are fundamental to phenomena ranging from condensed-matter physics to cosmology, yet they are generally difficult to simulate. Using an ion trap quantum computer and protocols motivated by the Quantum Approximate Optimization Algorithm (QAOA), we generate nontrivial thermal quantum states of the transversefield Ising model (TFIM) by preparing thermofield double states at a variety of temperatures. We also prepare the critical state of the TFIM at zero temperature using quantum-classical hybrid optimization. The entanglement structure of thermofield double and critical states plays a key role in the study of black holes, and our work simulates such nontrivial structures on a quantum computer. Moreover, we find that the variational quantum circuits exhibit noise thresholds above which the lowest depth QAOA circuits provide the best results.
*ARO through the IARPA LogiQ program, AFOSR MURIs on Quantum Measurement/Verification and Quantum Interactive Protocols, ARO MURI on Modular Quantum Circuits, DoE BES QIS Program, DOE HEP QuantISED Program, DoE ASCR Quantum Testbed program, NSF Physics Frontier Center at JQI, Industry Canada, the Province of Ontario through the Ministry of Research and Innovation, Intel Corporation.
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Presenters
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Anne Matsuura
- Intel Corp - Santa Clara
- Intel Labs, Intel Corporation