Initialization of quantum simulators by sympathetic cooling

authored by: Meghana Raghunandan, Fabian Wolf, Christian Ospelkaus, Piet O Schmidt, Hendrik Weimer
Abstract: Simulating computationally intractable many-body problems on a quantum simulator holds great potential to deliver insights into physical, chemical, and biological systems. While the implementation of Hamiltonian dynamics within a quantum simulator has already been demonstrated in many experiments, the problem of initialization of quantum simulators to a suitable quantum state has hitherto remained mostly unsolved. Here, we show that already a single dissipatively driven auxiliary particle can efficiently prepare the quantum simulator in a low-energy state of largely arbitrary Hamiltonians. We demonstrate the scalability of our approach and show that it is robust against unwanted sources of decoherence. While our initialization protocol is largely independent of the physical realization of the simulation device, we provide an implementation example for a trapped ion quantum simulator.
Organisation(s): Institute of Theoretical Physics
Institute of Quantum Optics
CRC 1227 Designed Quantum States of Matter (DQ-mat)
External Organisation(s): Physikalisch-Technische Bundesanstalt PTB
Type: Article
Journal: Science advances
Volume: 6
ISSN: 2375-2548
Publication date: 06.03.2020
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General
Electronic version(s): https://doi.org/10.1126/sciadv.aaw9268 (Access: Open)

BibTeX

@article{f830c709cdc3447485ae6629bea33975,
title = "Initialization of quantum simulators by sympathetic cooling",
abstract = "Simulating computationally intractable many-body problems on a quantum simulator holds great potential to deliver insights into physical, chemical, and biological systems. While the implementation of Hamiltonian dynamics within a quantum simulator has already been demonstrated in many experiments, the problem of initialization of quantum simulators to a suitable quantum state has hitherto remained mostly unsolved. Here, we show that already a single dissipatively driven auxiliary particle can efficiently prepare the quantum simulator in a low-energy state of largely arbitrary Hamiltonians. We demonstrate the scalability of our approach and show that it is robust against unwanted sources of decoherence. While our initialization protocol is largely independent of the physical realization of the simulation device, we provide an implementation example for a trapped ion quantum simulator.",
author = "Meghana Raghunandan and Fabian Wolf and Christian Ospelkaus and Schmidt, {Piet O} and Hendrik Weimer",
note = "Funding information: This work was funded by the Volkswagen Foundation and the DFG within SFB 1227 (DQ-mat, projects A01, A04, and B05).",
year = "2020",
month = mar,
day = "6",
doi = "10.1126/sciadv.aaw9268",
language = "English",
volume = "6",
journal = "Science advances",
issn = "2375-2548",
publisher = "American Association for the Advancement of Science",
number = "10",
}