A physical platform for nodes of the envisioned quantum
Internet
is long-sought. Here we propose such a platform, along with a conceptually
simple and experimentally uncomplicated quantum information processing
scheme, realized in a system of multiple crystal-phase quantum dots.
We introduce novel location qubits, describe a method to construct
a universal set of all-optical quantum gates, and simulate their performance
in realistic structures, including decoherence sources. Our results
show that location qubits are robust against the main decoherence
mechanisms, and realistic single-qubit gate fidelities exceed 99.9%.
Our scheme paves a clear way toward constructing multiqubit solid-state
quantum registers with a built-in photonic interfacea key
building block of the forthcoming quantum Internet.