Transporting, splitting, and connecting spin singlet pairs in a topological pump
- URL: http://arxiv.org/abs/2409.02984v2
- Date: Mon, 23 Dec 2024 13:31:49 GMT
- Title: Transporting, splitting, and connecting spin singlet pairs in a topological pump
- Authors: Zijie Zhu, Yann Kiefer, Samuel Jele, Marius Gächter, Giacomo Bisson, Konrad Viebahn, Tilman Esslinger,
- Abstract summary: We create spin singlet pairs of two magnetic states of fermionic potassium-40 atoms in an optical lattice.
We achieve pair pumping with a single-shift fidelity of 99.78(3)% over 50 lattice sites and split the pairs within a decoherence-free subspace.
Our work shows avenues to create complex patterns of entanglement and new approaches to quantum processing, sensing, and atom interferometry.
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- Abstract: Transporting and connecting quantum states are key capabilities for larger-scale quantum information processing. Concrete challenges are the coherent shuttling and the manipulation of distant quantum states in an optical lattice. Here, we create spin singlet pairs of two magnetic states of fermionic potassium-40 atoms in an optical lattice and use a bi-directional topological Thouless pump to transport, coherently split, and separate the pairs, as well as to demonstrate interaction between them via tuneable $($swap$)^\alpha$-gate operations. We achieve pair pumping with a single-shift fidelity of 99.78(3)% over 50 lattice sites and split the pairs within a decoherence-free subspace. Gates are implemented by superexchange interaction, allowing us to produce interwoven spin singlets. For read-out, we apply a magnetic field gradient, resulting in single- and multi-frequency singlet-triplet oscillations. Our work shows avenues to create complex patterns of entanglement and new approaches to quantum processing, sensing, and atom interferometry.
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