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Researchers at the University of Sheffield and Basel have successfully demonstrated high-efficiency quantum interference using up to four photons from a single quantum dot source. By integrating deterministic demultiplexing, the team achieved 84.1% contrast for four-photon states, overcoming previous efficiency bottlenecks that limited scaling in quantum dot-based systems. This advancement enables the manipulation of larger photonic states and suggests potential improvements for future quantum metrology applications.

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Four photons now interfere with high efficiency, a quantum dot first

Quantum ZeitgeistNovember 6, 20267 min read

Researchers achieved high-efficiency interference with up to four photons, using a quantum dot source and reaching 84.1% contrast.

Researchers at the University of Sheffield and University of Basel have, for the first time, demonstrated quantum interference using up to four photons emitted from a single quantum dot. The team overcame longstanding efficiency limitations by combining a quantum dot with a technique called deterministic demultiplexing, directly observing quantum interference fringes. Measurements reveal high interference contrasts of 93.0 ± 0.1% for two photons and 84.1 ± 1.0% for four, with the results predicting similar interference patterns will extend to even larger numbers of photons and potentially enhance quantum metrology. Deterministic demultiplexing, paired with a quantum dot, enabled the direct observation of quantum interference fringes originating from up to four photons, a feat previously limited by efficiency constraints in scaling quantum dot-based interference. The team’s approach allows for the manipulation of larger photonic states, essential for…

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