Details

Autor(en) / Beteiligte

• Rosenblum, S
• Gao, Y Y
• Reinhold, P
• Wang, C
• Axline, C J
• Frunzio, L
• Girvin, S M
• Jiang, Liang
• Mirrahimi, M
• Devoret, M H
• Schoelkopf, R J

Titel

A CNOT gate between multiphoton qubits encoded in two cavities

Ist Teil von

• Nature communications, 2018-02, Vol.9 (1), p.652-6, Article 652

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2018

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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.