Emulating quantum state transfer through a spin-1 chain on a one-dimensional lattice of superconducting qutrits

Joydip Ghosh

doi:10.1103/PhysRevA.90.062318

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Emulating quantum state transfer through a spin-1 chain on a one-dimensional lattice of superconducting qutrits

Joydip Ghosh

DOI 10.1103/PhysRevA.90.062318 · Physical Review A

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Abstract

Spin-1 systems, in comparison to spin-12 systems, offer a better security for encoding and transferring quantum information, primarily due to their larger Hilbert spaces. Superconducting artificial atoms possess multiple energy levels, thereby being capable of emulating higher-spin systems. Here I consider a one-dimensional lattice of nearest-neighbor-coupled superconducting transmon systems, and devise a scheme to transfer an arbitrary qutrit state (a state encoded in a three-level quantum system) across the chain. I assume adjustable couplings between adjacent transmons, derive an analytic constraint for the control pulse, and show how to satisfy the constraint to achieve a high-fidelity state transfer under current experimental conditions. My protocol thus enables enhanced quantum communication and information processing with promising superconducting qutrits.