About

Goals

The overarching objective of QCEED is to find solutions to current bottlenecks to photonic quantum information processing. “Scalable” photonic universal quantum computation exploits the measurement-based quantum computing paradigm relying on multi-dimensional photonic cluster states.

However, the technological capability to generate on-demand, large-scale 2-dimensional cluster states has not yet been proven. QCEED will demonstrate the (large-scale, i.e., many photons) emission of 2-dimensional cluster states of light thanks to the development of new engineered paired semiconductor quantum dot (QD) systems, and the exploitation of advanced deep nuclei cooling and/or dynamic spin decoupling to improve system coherence time.

To achieve this, one needs to deterministically design QD coupling/pairing and ultimately tailor specific molecular states/architectures (lambda like energy levels). Conventionally exploited self-assembled QD systems (e.g., SK or droplet epitaxy QD systems) are in general not suited for the task. QCEED will attack the issue with a twin-track approach and demonstrate the advantage of MOVPE site-controlled (In)GaAs pyramidal QDs and CBE InAsP nanowire QDs.

QCEED will also tackle the essential requirement for scalable quantum computation -that is to efficiently funnel the generated photons into specific photonic modes- by implementing tailored tapered wave-guiding designs and broadband optical cavities with relatively high Purcell factors.

QCEED brings together 7 partners from 5 countries which combined possess all the complementary expertise necessary to fulfil the ambitious objectives and to prepare a post-project sustainability and exploitability plan.

The combined effort will result in a new scalable platform of semiconductor sources of multidimensional cluster states for efficient quantum information processing. If successful, large scale, on chip, quantum photonic computation will be a significantly closer certainty