High-fidelity cluster state generation for ultracold atoms in an optical lattice

Abstract

We propose a method for generating high-fidelity multipartite spin-entanglement of ultracold atoms in an optical lattice in a short operation time with a scalable manner, which is suitable for measurement-based quantum computation. To perform the desired operations based on the perturbative spin-spin interactions, we propose to actively utilize the extra degrees of freedom (DOFs) usually neglected in the perturbative treatment but included in the Hubbard Hamiltonian of atoms, such as, (pseudo-)charge and orbital DOFs. Our method simultaneously achieves high fidelity, short operation time, and scalability by overcoming the following fundamental problem: enhancing the interaction strength for shortening operation time breaks the perturbative condition of the interaction and inevitably induces unwanted correlations among the spin and extra DOFs.

9 pages, 11 figures

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• Spin Entanglement and Magnetic Competition via Long-range Interactions in Spinor Quantum Optical Lattices
• Scalable quantum computation architecture using always-on Ising interactions via quantum feedforward
• Measurement-based quantum computation using two-component BECs
• Generating scalable entanglement of ultracold bosons in superlattices through resonant shaking
• Phase Transitions and Noise Robustness of Quantum Graph States