期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-03059-5
关键词
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资金
- U.S. Army Research Office [W911NF-14-1-0011]
- A*STAR NSS Fellowship
- U.S. Air Force Office of Scientific Research [FA9550-15-1-0015]
- NSF [DGE-1122492]
- National Science Foundation [DMR-1609326, MRSECDMR-1119826]
- Alfred P. Sloan Foundation
- Packard Foundation
- Yale Institute for Nanoscience and Quantum Engineering (YINQE)
- Yale SEAS cleanroom
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1609326] Funding Source: National Science Foundation
Entangling gates between qubits are a crucial component for performing algorithms in quantum computers. However, any quantum algorithm must ultimately operate on error-protected logical qubits encoded in high-dimensional systems. Typically, logical qubits are encoded in multiple two-level systems, but entangling gates operating on such qubits are highly complex and have not yet been demonstrated. Here we realize a controlled NOT (CNOT) gate between two multiphoton qubits in two microwave cavities. In this approach, we encode a qubit in the high-dimensional space of a single cavity mode, rather than in multiple two-level systems. We couple two such encoded qubits together through a transmon, which is driven by an RF pump to apply the gate within 190 ns. This is two orders of magnitude shorter than the decoherence time of the transmon, enabling a high-fidelity gate operation. These results are an important step towards universal algorithms on error-corrected logical qubits.
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