Ultrafast critical ground state preparation via bang-bang protocols
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F20%3A73601839" target="_blank" >RIV/61989592:15310/20:73601839 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/1367-2630/abb1df/pdf" target="_blank" >https://iopscience.iop.org/article/10.1088/1367-2630/abb1df/pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1367-2630/abb1df" target="_blank" >10.1088/1367-2630/abb1df</a>
Alternative languages
Result language
angličtina
Original language name
Ultrafast critical ground state preparation via bang-bang protocols
Original language description
The fast and faithful preparation of the ground state of quantum systems is a challenging but crucial task for several applications in the realm of quantum-based technologies. Decoherence limits the maximum time-window allowed to an experiment to faithfully achieve such desired states. This is of particular significance in systems featuring a quantum phase transition, where the vanishing energy gap challenges an adiabatic ground state preparation. We show that a bang-bang protocol, consisting of a time evolution under two different values of an externally tunable parameter, allows for a high-fidelity ground state preparation in evolution times no longer than those required by the application of standard optimal control techniques, such as the chopped-random basis quantum optimization. In addition, owing to their reduced number of variables, such bang-bang protocols are very well suited to optimization tasks, reducing the high computational cost of other optimal control protocols. We benchmark the performance of such approach through two paradigmatic models, namely the Landau-Zener and the Lipkin-Meshkov-Glick model. Remarkably, we find that the critical ground state of the latter model, i.e. its ground state at the critical point, can be prepared with a high fidelity in a total evolution time that scales slower than the inverse of the vanishing energy gap.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
New Journal of Physics
ISSN
1367-2630
e-ISSN
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Volume of the periodical
22
Issue of the periodical within the volume
9
Country of publishing house
GB - UNITED KINGDOM
Number of pages
12
Pages from-to
" 093050-1"-" 093050-12"
UT code for WoS article
000574556700001
EID of the result in the Scopus database
2-s2.0-85091629600