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A CNOT gate between multiphoton qubits encoded in two cavities.


ABSTRACT: 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.

SUBMITTER: Rosenblum S 

PROVIDER: S-EPMC5811561 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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A CNOT gate between multiphoton qubits encoded in two cavities.

Rosenblum S S   Gao Y Y YY   Reinhold P P   Wang C C   Axline C J CJ   Frunzio L L   Girvin S M SM   Jiang Liang L   Mirrahimi M M   Devoret M H MH   Schoelkopf R J RJ  

Nature communications 20180213 1


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 cavitie  ...[more]

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