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Benchmarking logical three-qubit quantum Fourier transform encoded in the Steane code on a trapped-ion quantum computer

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arxiv 2404.08616 v1 pith:EZAQNWOC submitted 2024-04-12 quant-ph

classification quant-ph
keywords logicalbenchmarkcircuitsquantumbenchmarkingcodecomputerencoded
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We implement logically encoded three-qubit circuits for the quantum Fourier transform (QFT), using the [[7,1,3]] Steane code, and benchmark the circuits on the Quantinuum H2-1 trapped-ion quantum computer. The circuits require multiple logical two-qubit gates, which are implemented transversally, as well as logical non-Clifford single-qubit rotations, which are performed by non-fault-tolerant state preparation followed by a teleportation gadget. First, we benchmark individual logical components using randomized benchmarking for the logical two-qubit gate, and a Ramsey-type experiment for the logical $T$ gate. We then implement the full QFT circuit, using two different methods for performing a logical control-$T$, and benchmark the circuits by applying it to each basis state in a set of bases that is sufficient to lower bound the process fidelity. We compare the logical QFT benchmark results to predictions based on the logical component benchmarks.

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Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

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  4. Demonstration of measurement-free universal fault-tolerant quantum computation

    quant-ph 2025-06 conditional novelty 6.0 of 10

    A trapped-ion experiment realizes measurement-free fault-tolerant logical teleportation, a universal logical gate set, and a three-logical-qubit Grover search, albeit with success below the classical baseline.

  5. Correcting a noisy quantum computer using a quantum computer

    quant-ph 2025-06 conditional novelty 6.0 of 10

    A variational quantum circuit, trained on syndrome data, decodes surface codes with accuracy close to minimum-weight perfect matching in classical simulation.

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