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Controlled coherent coupling of single quantum dots in photonic crystal cavity networks

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  • Full or part time
    Prof W W Langbein
    Dr E Muljarov
    Dr Daryl Beggs
  • Application Deadline
    No more applications being accepted
  • Competition Funded PhD Project (European/UK Students Only)
    Competition Funded PhD Project (European/UK Students Only)

Project Description

The proposed project spans from the field of optical spectroscopy of semiconductor nanostructures, specifically coherent spectroscopy of single quantum dots, to quantum computing, specifically the implementation of quantum operations in quantum dots.
Technological advances in light detectors and microscopy techniques during the last decade have allowed the investigation of the emission properties of individual localized light emitters such as dye molecules, defects in semiconductors, or semiconductor quantum dots. The observation of coherence in these systems and their manipulation by coherent control is presently at the forefront of the research in the field, driven by the expectation that these techniques allow the implementation of quantum information processing using optical transitions in single quantum dots as qubits or to control spin q-bits. The goal of the project is the application of the unique experimental technique of heterodyne spectral interferometry (HSI) [Optics Letters 31, 1151 (2006)] to determine the coherent coupling structure in few-quantum-dot systems by two-dimensional four-wave mixing [Nature Photonics 5, 57 (2011)], and then use this knowledge to design optical control pulses to implement simple quantum gates in the few-quantum-dot system, again using HSI to read the result of the gate operations [Phys. Rev. Lett. 95, 266401 (2005)]. The detailed information about the quantum system gained by this detection scheme will be used to design the control pulse to a quantum gate of high fidelity. Previous experiments by the supervisor detected the coherent coupling between localized excitons in quantum wells [Nature Photonics 5, 57 (2011] and between quantum dots mediated by a cavity [Nature Communications 4, 1747 (2013)]. Recent work showed the multi-wave coherent control [Nature Photonics 10, 155 (2016)] and the radiatively limited dephasing of excitons in WS2 [2D Materials 5, 031007 (2018)]. The project is embedded in an ongoing EPSRC grant [EP/M020479/1] and will benefit from the support by one ongoing PhD and two PDRAs working on related topics and supporting the required experimental setups and theoretical predictions.

Feasibility of completion within 3.5 years: The project outline plan is as follows; Month 1-9: literature review, training on HSI setup and data analysis. Month 10-18: Coherent coupling between QDs in a PCC. Incoherent coupling via phonons. Publication. Month 19-27: Coupling between QDs in separated coupled PCC. Publication. Month 28-33: Control of coherent coupling via electrical tuning. Publication. Month 35-38: thesis writing, submission,viva

Funding Notes

Full UK/EU tuition fees plus stipend matching UKRI Minimum.

Full awards are open to UK Nationals and EU students who meet UK residency requirements. To be eligible for the full award, EU Nationals must have been in the UK for at least three years prior to the start of the course including for full-time education.

A small number of awards may also be made available to EU Nationals who do not meet the above residency requirement, provided they have been ordinarily resident in the EU for at least three years before the start of their proposed programme of study


L. Scarpelli et al., Phys. Rev. B 96, 045407 (2017) DOI 10.1103/PhysRevB.96.045407
F. Fras, et al., Nature Photonics 10, 155 (2016) DOI 10.1038/nphoton.2016.2
F. Albert et al, Nature Communications 4, 1747 (2013) DOI 10.1038/ncomms2764

How good is research at Cardiff University in Physics?

FTE Category A staff submitted: 19.50

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