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Demonstration of three- and four-body interactions between trapped-ion spins

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arxiv 2209.05691 v1 pith:6Y7WG7JP submitted 2022-09-13 quant-ph physics.atom-ph

classification quant-phphysics.atom-ph
keywords interactionsnativequantumfour-bodypairwiseprocessorsqubitsspin
verification ladder T0 review T1 audit T2 compute T3 formal

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Quantum processors use the native interactions between effective spins to simulate Hamiltonians or execute quantum gates. In most processors, the native interactions are pairwise, limiting the efficiency of controlling entanglement between many qubits. Here we experimentally demonstrate a new class of native interactions between trapped-ion qubits, extending conventional pairwise interactions to higher order. We realize three- and four-body spin interactions as examples, showing that high-order spin polynomials may serve as a new toolbox for quantum information applications.

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  1. Fast quantum computation with all-to-all Hamiltonians

    quant-ph 2025-09 conditional novelty 8.0 of 10

    All-to-all Hamiltonians can simulate any two-qubit gate in about 1/N time and any depth-D circuit in about D/√N time, with polynomially small error.

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