Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically
Abstract
Recent work has demonstrated a new route to discrete time crystal physics in quantum spin chains by periodically driving nearest-neighbor exchange interactions in gate-defined quantum dot arrays [arXiv:2006.10913]. Here, we present a detailed analysis of exchange-driven Floquet physics in small arrays of GaAs quantum dots, including phase diagrams and additional diagnostics. We also show that emergent time-crystalline behavior can benefit the protection and manipulation of multi-spin states. For typical levels of nuclear spin noise in GaAs, the combination of driving and interactions protects spin-singlet states beyond what is possible in the absence of exchange interactions. We further show how to construct a time-crystal-inspired CZ gate between singlet-triplet qubits with high fidelity. These results show that periodically driving exchange couplings can enhance the performance of quantum dot spin systems for quantum information applications.
Cite
@article{arxiv.2009.08469,
title = {Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically},
author = {John S. Van Dyke and Yadav P. Kandel and Haifeng Qiao and John M. Nichol and Sophia E. Economou and Edwin Barnes},
journal= {arXiv preprint arXiv:2009.08469},
year = {2021}
}
Comments
12 pages, 16 figures