Kavli Affiliate: Irfan Siddiqi
| First 5 Authors: Francesco Turro, Trevor Chistolini, Akel Hashim, Yosep Kim, William Livingston
| Summary:
Quantum computers hold great promise for arriving at exact simulations of
nuclear dynamical processes (e.g., scattering and reactions) that are paramount
to the study of nuclear matter at the limit of stability and to explaining 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. 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
a quantum processor. This hybrid algorithm is demonstrated by a quantum
simulation of the scattering of two neutrons performed at the Lawrence Berkeley
National Laboratory’s Advanced Quantum Testbed. We show that, after
implementation of error mitigation strategies to improve the accuracy of the
algorithm in addition to the use of either circuit compression techniques or
tomography as methods to elucidate the onset of decoherence, this initial
demonstration validates the principle of the proposed co-processing scheme. We
anticipate that a generalization of this present scheme will open the way for
(real-time) path integral simulations of nuclear scattering.
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