/State preserving fiber-to chips coupling of photonic qubits

State preserving fiber-to chips coupling of photonic qubits

Leuven | More than two weeks ago

While -0.2dB coupling efficiency of current fiber to chip couplers is sufficient for classical applications it is to lossy (5%) for fragile quantum applications....

Optical interconnects are at the heart of today’s information technology as they are the link that enables humanity to benefit from cloud-based computing, mobile streaming, instantaneous messaging and communications etc. Like many technologies optics rely on hybrid systems such as photonic chips for data processing and optical fibers for long-haul transmission and coupling schemata are needed to combine them. The achievable efficiency depends on the coupler method (grating coupler, edge coupler, evanescent coupler) and in general achieving larger efficiencies comes at the cost of more complex fabrication, larger footprint or vertical alignment. For instance, edge coupling with transmission loss of ~0.25dB  (~5.5%) have been reported, while more compact grating couplers achieve transmission losses of ~0.5dB (10.8%).

And while this performance is already good for classical applications it does not suffice for the more stringent requirements of quantum applications. The issue of the limited coupling efficiency is even more important as photonic based quantum systems is a tremendous engineering task and a monolithic platform (e.g. silicon photonics) cannot meet all the requirement simultaneously. Heterogenous integration of different quantum technologies (silicon photonics, III-V single photon source, superconducting single photon detectors) in a single functional unit have great potential to overcome the obstacles. However, coupling losses at each technology interface contributes noise that causes decoherence of the quantum state. In this work we will push the coupling efficiency towards unity .


Type of project: Combination of internship and thesis, Thesis, Internship

Duration: 6 months

Required degree: Master of Engineering Technology, Master of Science

Required background: Electrotechnics/Electrical Engineering, Physics, Nanoscience & Nanotechnology

Supervising scientist(s): For further information or for application, please contact: Christian Haffner (Christian.Haffner@imec.be)

Imec allowance will be provided for students studying at a non-Belgian university.

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