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Demonstration of a quantum-classical coprocessing protocol for simulating nuclear reactions

Journal Article · · Physical Review A
 [1];  [2];  [3];  [3];  [3];  [3];  [4];  [4];  [5];  [4];  [6];  [3]
  1. University of Washington, Seattle, WA (United States); University of Trento (Italy); National Institute of Nuclear Physics (INFN), Trento (Italy)
  2. University of California, Berkeley, CA (United States)
  3. University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  4. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  5. University of Trento (Italy); National Institute of Nuclear Physics (INFN), Trento (Italy)
  6. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations
Quantum computers hold great promise for exact simulations of nuclear dynamical processes (e.g., scattering and reactions), which are paramount to the study of nuclear matter at the limit of stability and in the formation of chemical elements in stars. However, quantum simulations of the unitary (real) time dynamics of fermionic many-body systems require a currently prohibitive number of reliable and long-lived qubits. Here we propose a co-processing algorithm for the simulation of real-time dynamics in which the time evolution of the spatial coordinates is carried out on a classical processor, while the evolution of the spin degrees of freedom is carried out on quantum hardware. We demonstrate this hybrid scheme with the simulation of two neutrons scattering at the Lawrence Berkeley National Laboratory's Advanced Quantum Testbed. After implementing error mitigation strategies to improve the accuracy of the algorithm in addition to a combination of circuit compression techniques and tomography as methods to elucidate the onset of decoherence, our results validate the principle of the proposed co-processing scheme. A generalization of this present scheme will open the way for (real-time) path integral simulations of nuclear scattering.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-07NA27344; SC0020970
OSTI ID:
2204949
Alternate ID(s):
OSTI ID: 2001014
Report Number(s):
LLNL--JRNL-853700; 1077953
Journal Information:
Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 108; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
nuclear reactions
quantum algorithms and computation
quantum computation
quantum error correction