A projected least-squares tomography protocol adapted for distributed quantum processors delivers rigorous non-asymptotic trace-norm error bounds that grow exponentially with the number of nodes and certified bounds on entanglement negativity.
Benjamin, Suguru Endo, William J
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H-VEC converts any classical repetition code into a quantum error-correcting protocol by adding one qubit and post-processing to project noise onto correctable Y-errors, yielding exponential suppression under code-capacity noise and quadratic qubit savings in fault-tolerant lattice surgery.
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Rigorous quantum state tomography for distributed quantum computing
A projected least-squares tomography protocol adapted for distributed quantum processors delivers rigorous non-asymptotic trace-norm error bounds that grow exponentially with the number of nodes and certified bounds on entanglement negativity.
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Correcting quantum errors using a classical code and one additional qubit
H-VEC converts any classical repetition code into a quantum error-correcting protocol by adding one qubit and post-processing to project noise onto correctable Y-errors, yielding exponential suppression under code-capacity noise and quadratic qubit savings in fault-tolerant lattice surgery.