Benchmarking exchange-only control of a 48-spin singlet manifold
An arXiv preprint reports a benchmark of exchange-only control across a 48-spin singlet manifold. Exchange-only encodings promise high-fidelity operation through the exchange interaction, but each logical qubit consumes at least three electron spins, so only part of the available spin Hilbert space is used for computation. The work characterizes control within this spin manifold.
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What this could mean
- 0–2 yearsPlausible
This benchmark could provide the leakage and control-error data needed to tune exchange-only qubits in multi-dot devices, making it feasible to operate larger spin-qubit registers with fewer calibration overheads within two years.
A well-characterized 48-spin manifold gives a reference for pulse calibration and error budgeting; if the measured fidelities are high enough, existing silicon or GaAs quantum dot fabrication lines could adopt exchange-only encodings without major new hardware.
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