A fan-out coupling architecture enables constant-depth direct quantum state tomography with built-in error mitigation via involutory repetition, experimentally validated up to 20 qubits on superconducting hardware.
X.et al.Verifying multipartite entangled Greenberger–Horne–Zeilinger states via multiple quan- tum coherences.Phys
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Efficient direct quantum state tomography using fan-out couplings
A fan-out coupling architecture enables constant-depth direct quantum state tomography with built-in error mitigation via involutory repetition, experimentally validated up to 20 qubits on superconducting hardware.