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Klaus Mølmer

Deterministic quantum network for distributed entanglement and quantum computation

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We propose a simple interaction protocol to be implemented on a scalable quantum network, in which the quantum nodes consist of qubit systems confined in cavities. The nodes are deterministically coupled by transmission and reflection of a single photon, which is disentangled from the qubits at the end of the coupling operation. This single photon can generate an entangling controlled-PHASE gate between any selected number of qubits in the network. Our multiqubit gate reaches a much higher fidelity compared to schemes concatenating one-qubit and two-qubit gates; thus it forms an efficient basis for universal quantum computing distributed over multiple processor units. In our analysis we consider atomic qubits coupled to optical photons, while the scheme
can be readily generalized to other architectures, such as superconducting qubit nodes coupled by microwave photons.
OriginalsprogEngelsk
Artikelnummer030302(R)
TidsskriftPhysical Review A
Vol/bind98
Nummer3
Antal sider5
ISSN2469-9926
DOI
StatusUdgivet - 24 sep. 2018

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