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Integrated quantum photonic circuits

Time: Thu 2022-03-31 10.00

Location: FB54

Video link: Zoom:

Language: English

Participating: Ali Elshaari

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Photons and quantum optical technology have been the main testing grounds for fundamental ideas of quantum science. This can be traced back to the first quantum entanglement experiment using photons in an atomic cascade and ground breaking experiments in quantum teleportation and communication using photons from parametric down conversion process. Photons are robust and versatile candidates for a qubit with several coding schemes successfully implemented relying on polarization, time-domain, spatial-domain, frequency-domain, and even combination of more than one. Although there are alternative approaches currently under investigation to harness different quantum phenomena, the use of photons to communicate the results is inevitable, which makes the photonic approach even more attractive. Nevertheless, the constricted progress of quantum information processing and sensing implementations using quantum states of light can be traced to a scalability issue: implementing quantum optics experiments beyond the single photon level brings about large increases in required resources.

Here I will discuss the emerging field of quantum integrated photonics. The lecture aims to provide a historical perspective of the quantum nature of light, its applications in communication and computing, and the path to fully integrated systems, following the footsteps of electronic circuits based on electrons. Moreover, the power of quantum computers, in addition to the pros and cons of the integrated photonics approach are discussed, while highlighting the work done at KTH on hybrid quantum photonic devices.