Coherent quantum annealing in a programmable 2000-qubit Ising chain
- URL: http://arxiv.org/abs/2202.05847v2
- Date: Thu, 10 Mar 2022 18:49:44 GMT
- Title: Coherent quantum annealing in a programmable 2000-qubit Ising chain
- Authors: Andrew D. King, Sei Suzuki, Jack Raymond, Alex Zucca, Trevor Lanting,
Fabio Altomare, Andrew J. Berkley, Sara Ejtemaee, Emile Hoskinson, Shuiyuan
Huang, Eric Ladizinsky, Allison MacDonald, Gaelen Marsden, Travis Oh, Gabriel
Poulin-Lamarre, Mauricio Reis, Chris Rich, Yuki Sato, Jed D. Whittaker, Jason
Yao, Richard Harris, Daniel A. Lidar, Hidetoshi Nishimori and Mohammad H.
Amin
- Abstract summary: We show coherent evolution through a quantum phase transition in the paradigmatic setting of the 1D transverse-field Ising chain.
Results are in quantitative agreement with analytical solutions to the closed-system quantum model.
These experiments demonstrate that large-scale quantum annealers can be operated coherently.
- Score: 1.2472275770062884
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum simulation has emerged as a valuable arena for demonstrating and
understanding the capabilities of near-term quantum computers. Quantum
annealing has been used successfully in simulating a range of open quantum
systems, both at equilibrium and out of equilibrium. However, in all previous
experiments, annealing has been too slow to simulate a closed quantum system
coherently, due to the onset of thermal effects from the environment. Here we
demonstrate coherent evolution through a quantum phase transition in the
paradigmatic setting of the 1D transverse-field Ising chain, using up to 2000
superconducting flux qubits in a programmable quantum annealer. In large
systems we observe the quantum Kibble-Zurek mechanism with theoretically
predicted kink statistics, as well as characteristic positive kink-kink
correlations, independent of system temperature. In small chains, excitation
statistics validate the picture of a Landau-Zener transition at a minimum gap.
In both cases, results are in quantitative agreement with analytical solutions
to the closed-system quantum model. For slower anneals we observe
anti-Kibble-Zurek scaling in a crossover to the open quantum regime. These
experiments demonstrate that large-scale quantum annealers can be operated
coherently, paving the way to exploiting coherent dynamics in quantum
optimization, machine learning, and simulation tasks.
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