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Reference : UMR9001-PASSEN-004
Workplace : PALAISEAU
Date of publication : Thursday, March 12, 2020
Scientific Responsible name : Pascale Senellart
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 June 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
The objective of the present PhD position is to develop ultra-efficient quantum light sources and use them for on-chip optical quantum computing.
We study single quantum dots deterministically coupled to a pillar optical microcavity. Combined with an electrical contact, this technology has already allowed developing high-efficency sources of single indistinguishable photons1,2. The sources show near unity quantum purity for a brightness of typically 15%---defined as the probability to obtain a single photon per pulse. Such efficiency, already ten times higher than heralded single photon sources, has allowed to increase the rate for quantum manipulation of 3 photons in a glass photonic chip3.
The objective of the PhD work is to push further the efficiency of the single photon sources, exploring new excitation schemes and developing new cavity designs. These sources will then be used to implement small scale optical quantum computation on chip, within our collaboration with the groups of Fabio Sciarrino (Rome) and Roberto Osellame (Milan). Finally, to further increase the quantum resources for quantum computing, we will explore the efficient generation of entangled photon pairs making use of the entanglement between the emitted single photons and the spin state of a carrier in the quantmum dot.
This PhD project is funded by the Innovative Training Network ITN QUDOT-TECH (www.qudot-tech.eu) that aims at developing a solid-state platform for on-chip quantum information processing.
Constraints and risks
Clean room work
Quantum physics has had a revolutionary impact on industry and society in the past century, giving birth to the semiconductor industry and the resulting first generation of quantum devices (computers, TVs, smartphones etc.). Whereas semiconductor physics has arisen from quantum science, the engineering principles of these first generation devices have remained anchored on classical physics. We are presently at the verge of a second revolution of quantum science, where quantum engineering based on direct exploitation of fundamental quantum mechanical abilities such as superposition and entanglement promises entire new technologies for society. However, lack of scalability of quantum information (QI) technology remains the fundamental technical challenge preventing most QI technologies from becoming a reality - a critical bottleneck to which a new generation of researchers is urgently needed.
In QUDOT-TECH we build from the semiconductor QD - the most mature QI technology - and propose a solution to the scalability obstacle in the form of a quantum network based on QDs coupled efficiently to each other using optical waveguides. We will construct the world's first platform for fully integrated on-chip QI processing, a cornerstone potentially equivalent to the silicon transistor in the first generation of quantum devices. As this is frontier research, current doctoral research programmes do not provide the required interdisciplinary skillset and the entrepreneurial-like mind-set required to secure application-oriented breakthroughs within the QI field. Hereto, we have gathered the best European academic and industrial partners to train 15 Early Stage Researchers (ESRs) to an outstanding level, where they can act as Europe's future leaders within QI technology. The QUDOT-TECH ESRs will fill in a much needed link between academia and industry and will make the new technology widely available through one or more spin-out companies - ultimately propelling Europe to leadership at the global scale.
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