Quantum Dot coupling engineering (and dynamic spin decoupling/deep nuclei cooling): 2-dimensional cluster state generation for quantum information processing

Introduction

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.

Current Challenges

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

Design Requirements

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 generally not suited for the task. QCEED will tackle the issue with a twin-track approach and demonstrate the advantage of:

1. MOVPE site-controlled (In)GaAs pyramidal QDs
2. CBE InAsP nanowire QDs

Photon Management

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

Collaborative Effort

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

Expected Outcomes

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.