2024/05/24 by Xi Yu, Benjamin Wilhelm, Danielle Holmes +19 · 1 voice · 2 citations
Computer Science · Physics and Astronomy · #Law #Optoelectronics #Physics #Political science #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum mechanics #Schrödinger's cat #Silicon #Silicon valley #Spin (aerodynamics) #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1038/s41567-024-02745-0
arxiv published 2024/05/24 · openalex publication_date 2025/01/14 · arxiv updated 2025/01/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23
High-dimensional quantum systems are a valuable resource for quantum information processing. They can be used to encode error-correctable logical qubits, which has been demonstrated using continuous-variable states in microwave cavities or the motional modes of trapped ions. For example, high-dimensional systems can be used to realise `Schrödinger cat' states, superpositions of widely displaced coherent states that can also be used to illustrate quantum effects at large scales. Recent proposals have suggested encoding qubits in high-spin atomic nuclei, finite-dimensional systems that can host hardware-efficient versions of continuous-variable codes. Here we demonstrate the creation and manipulation of Schrodinger cat states using the spin-7/2 nucleus of an antimony atom embedded in a silicon nanoelectronic device. We use a multi-frequency control scheme to produce spin rotations that preserve the symmetry of the qudit, and constitute logical Pauli operations for qubits encoded in the Schrodinger cat states. Our work demonstrates the ability to prepare and control nonclassical resource states, a prerequisite for applications in quantum information processing and quantum error correction using our scalable, manufacturable semiconductor platform.