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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 in the group 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)]. . The project is embedded in an ongoing EPSRC grant [EP/M020479/1]. The project will benefit from the support by two ongoing PhDs and two PDRAs working on related topics and supporting the required experimental setups and theoretical predictions.

This project will start on 01/10/2018

Funding Notes

- Full UK/EU tuition fees
- Stipend at UK Research Council minimum (UK applicants only)
- Research Training Support Grant (RTSG) are also available. There are other opportunities and benefits available to studentship holders, including an overseas fieldwork allowance (if applicable), internship opportunities, overseas institutional visits and other small grants.
The successful applicant must have no restrictions on how long they can stay in the UK/EU and have been ordinarily resident in the UK/EU for at least three years prior to the start of the studentship

How good is research at Cardiff University in Physics?

FTE Category A staff submitted: 19.50

Research output data provided by the Research Excellence Framework (REF)

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