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Title: Electron-Phonon Systems on a Universal Quantum Computer

Journal Article · · Physical Review Letters

We present an algorithm that extends existing quantum algorithms for simulating fermion systems in quantum chemistry and condensed matter physics to include bosons in general and phonons in particular. We introduce a qubit representation for the low-energy subspace of phonons which allows an efficient simulation of the evolution operator of the electron-phonon systems. As a consequence of the Nyquist-Shannon sampling theorem, the phonons are represented with exponential accuracy on a discretized Hilbert space with a size that increases linearly with the cutoff of the maximum phonon number. The additional number of qubits required by the presence of phonons scales linearly with the size of the system. The additional circuit depth is constant for systems with finite-range electron-phonon and phonon-phonon interactions and linear for long-range electron-phonon interactions. Our algorithm for a Holstein polaron problem was implemented on an Atos quantum learning machine quantum simulator employing the quantum phase estimation method. In conclusion, the energy and the phonon number distribution of the polaron state agree with exact diagonalization results for weak, intermediate, and strong electron-phonon coupling regimes.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1438542
Alternate ID(s):
OSTI ID: 1469746
Report Number(s):
arXiv:1802.07347; FERMILAB-PUB-18-050-CD-T; PRLTAO; 1657311; TRN: US1900449
Journal Information:
Physical Review Letters, Vol. 121, Issue 11; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 67 works
Citation information provided by
Web of Science

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Cited By (4)

Quantum-Classical Computation of Schwinger Model Dynamics using Quantum Computers text January 2018
Quantum computational chemistry text January 2018
General Methods for Digital Quantum Simulation of Gauge Theories text January 2019
Gluon Field Digitization for Quantum Computers text January 2019

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