Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.110501
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Funding
- National Basic Research Program (973) of China [2017YFA0304300]
- Chinese Academy of Science
- NSFC [11434008, 11574380]
- Alibaba Cloud
- Science and Technology Committee of Shanghai Municipality
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We report the preparation and verification of a genuine 12-qubit entanglement in a superconducting processor. The processor that we designed and fabricated has qubits lying on a 1D chain with relaxation times ranging from 29.6 to 54.6 mu s. The fidelity of the 12-qubit entanglement was measured to be above 0.5544 +/- 0.0025, exceeding the genuine multipartite entanglement threshold by 21 statistical standard deviations. After thermal cycling, the 12-qubit state fidelity was further improved to be above 0.707 +/- 0.008. Our entangling circuit to generate linear cluster states is depth invariant in the number of qubits and uses single- and double-qubit gates instead of collective interactions. Our results are a substantial step towards large-scale random circuit sampling and scalable measurement-based quantum computing.
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