Abstract
Single photons are the cornerstones of many applications in quantum technologies, from quantum computing to quantum networks. A new technology for the generation of single-photons has recently emerged, allowing a ten-time increase in efficiency with near-unity quantum purity. These single-photon sources are based on semiconductor quantum dots in optical microcavities.
Highlights
LIGHT IN QUANTUM TECHNOLOGIES Light, and more precisely quantum light is a key component of the emerging second quantum revolution
We discuss approaches based on discrete variables, an approach where first small-size quantum computing processors have been demonstrated with a defined path toward a universal quantum-computing machine
The single-photon pulse is a quantum superposition of single photon states of various frequencies with complex coefficients: the source should produce always the exact same superposition. This property is crucial for quantum technologies as it allows the implementation of photon-photon gates both for quantum computing or quantum communications
Summary
LIGHT IN QUANTUM TECHNOLOGIES Light, and more precisely quantum light is a key component of the emerging second quantum revolution. Some approaches encode the information on single photons (discrete variables), others exploit quantum modes (continuous variables). The early development of optical quantum technologies has relied on single-photon sources based on optical frequency conversion: a laser pulse sent on a non-linear crystal generates photon pairs.
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