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Deterministic linear-optical computing with symmetry-based qubits
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DOI：10.1007/s11128-026-05157-6.png)
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Abstract
En 中文
A particular type of linear optical multiport, the Grover four-port, has previously been shown to couple the spatial symmetry of a photon to its direction of travel. It is shown here that use of a nonstandard choice of qubit, based on symmetry, allows Grover four ports to act as compact, low-resource deterministic linear optical controlled NOT gates, with no post-selection or ancilla measurements required. This approach allows programmable devices, made from Grover multiports in combination with other standard optical components, that can implement multiple different one-, two-, and three-qubit gates, including the Fredkin and Toffoli gates.
Keywords:
Linear-optical computing
Quantum computing
Symmetry-based qubits
Nonstandard qubits
Synthetic qubits
Controlled quantum gates