In the standard approach to adiabatic quantum computing (AQC), quantum information stored on qubits are adia- batically evolved to find the lowest energy state of a problem Hamiltonian. Here we investigate a variation of AQC where spin ensembles are used in place of qubits. The use of ensembles duplicates the quantum information, and allows errors to be suppressed during the adiabatic evolution. We show that there are two distinct types of problem Hamiltonians under this mapping, where the first excited state is a single particle perturbation on the ground state (Type I); or a macroscopically distinct fully polarized state (Type II). For Type I problems, we find that the minimum gap for large ensembles is well predicted by mean-field theory and the AQC performance improves with ensemble size, realizing error-suppression. For Type II problems, the performance of the AQC is mixed, and the gap can increase or decrease with ensemble size depending on the problem instance. The incidences of the Type II problems are greatly suppressed with ensemble size, and consequently for randomly chosen problem instances the success probability of the scheme improves with the ensemble size. Our approach shows that it is possible to perform AQC without the necessity of controlling individual qubits, which allows for an alternative route towards implementing AQC.
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23 June 2020
FIFTH INTERNATIONAL CONFERENCE ON QUANTUM TECHNOLOGIES (ICQT-2019)
15–19 July 2019
Moscow, Russia
Research Article|
June 23 2020
Adiabatic quantum computation with spin ensembles
Naeimeh Mohseni;
Naeimeh Mohseni
1)
State Key Laboratory of Precision Spectroscopy, School of Physical and Material Sciences, East China Normal University
, Shanghai 200062, China
2)
Max-Planck-Institut für die Physik des Lichts
, Staudtstrasse 2, 91058 Erlangen
, Germany
3)
Department of Physics, Institute for Advanced Studies in Basic Sciences(IASBS)
, Zanjan 45137-66731, Iran
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Marek Narozniak;
Marek Narozniak
4)
New York University Shanghai, 1555 Century Ave
, Pudong, Shanghai 200122, China
5)
Department of Physics, New York University
, New York, NY 10003, USA
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Alexey N. Pyrkov;
Alexey N. Pyrkov
6)
Institute of Problems of Chemical Physics RAS
, Acad. Semenov av., 1, Chernogolovka, 142432, Russia
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Valentin Ivannikov;
Valentin Ivannikov
1)
State Key Laboratory of Precision Spectroscopy, School of Physical and Material Sciences, East China Normal University
, Shanghai 200062, China
4)
New York University Shanghai, 1555 Century Ave
, Pudong, Shanghai 200122, China
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Jonathan P. Dowling;
Jonathan P. Dowling
7)
Hearne Institute for Theoretical Physics, Department of Physics and Astronomy, Louisiana State University
, Baton Rouge, Louisiana 70803, USA
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Tim Byrnes
Tim Byrnes
a)
4)
New York University Shanghai, 1555 Century Ave
, Pudong, Shanghai 200122, China
5)
Department of Physics, New York University
, New York, NY 10003, USA
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Naeimeh Mohseni
1,2,3
Marek Narozniak
4,5
Alexey N. Pyrkov
6
Valentin Ivannikov
1,4
Jonathan P. Dowling
7
Tim Byrnes
4,5,a)
1)
State Key Laboratory of Precision Spectroscopy, School of Physical and Material Sciences, East China Normal University
, Shanghai 200062, China
2)
Max-Planck-Institut für die Physik des Lichts
, Staudtstrasse 2, 91058 Erlangen
, Germany
3)
Department of Physics, Institute for Advanced Studies in Basic Sciences(IASBS)
, Zanjan 45137-66731, Iran
4)
New York University Shanghai, 1555 Century Ave
, Pudong, Shanghai 200122, China
5)
Department of Physics, New York University
, New York, NY 10003, USA
6)
Institute of Problems of Chemical Physics RAS
, Acad. Semenov av., 1, Chernogolovka, 142432, Russia
7)
Hearne Institute for Theoretical Physics, Department of Physics and Astronomy, Louisiana State University
, Baton Rouge, Louisiana 70803, USA
a)
Electronic mail: [email protected]
AIP Conf. Proc. 2241, 020008 (2020)
Citation
Naeimeh Mohseni, Marek Narozniak, Alexey N. Pyrkov, Valentin Ivannikov, Jonathan P. Dowling, Tim Byrnes; Adiabatic quantum computation with spin ensembles. AIP Conf. Proc. 23 June 2020; 2241 (1): 020008. https://doi.org/10.1063/5.0011393
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