description linear optical quantum computing Overview
Linear optical quantum computing utilizes photons and beam splitters to perform quantum computations, relying on precise control of light's polarization to encode and manipulate qubits, often requiring probabilistic success due to inherent photon loss.
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How are qubits encoded in linear optical quantum computing?
A photonic qubit can be encoded in two optical paths, two polarizations, time bins, or other modes of a single photon. Beam splitters, phase shifters, and interferometers then manipulate those modes.
Why are two-qubit gates difficult with linear optics?
Photons ordinarily pass through one another without the strong interaction needed for a deterministic entangling gate. LOQC therefore uses interference, ancilla photons, detectors, and measurement-induced operations, which makes many gates probabilistic.
What is the KLM scheme in photonic quantum computing?
The KLM protocol was proposed by Emanuel Knill, Raymond Laflamme, and Gerard Milburn around 2000. It showed that universal quantum computation is possible with linear optical components, single-photon sources, photodetection, ancillas, teleportation, and error correction.
What prevents linear optical quantum computers from scaling easily?
Major obstacles include photon loss, imperfect single-photon sources, detector errors, and the large resource overhead of probabilistic gates. Losing even one photon can corrupt an encoded state, so fault-tolerant designs require substantial redundancy.
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