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PhD position on Spin-Photon Interfaces at the Center for Nanoscience and Nanotechnology (Marie Curie ITN funding)

Laboratory: Center for Nanoscience and Nanotechnology (C2N)
Group of Solid State Quantum Optics – http://quantumdot.eu/
Address: 10 Bd Thomas Gobert, 91120 Palaiseau (south of Paris area)
Thesis director: Loïc Lanco / +33 (0) 1 70 27 03 73 / loic.lanco@univ-paris-diderot.fr
Co-advisor: Pascale Senellart / +33 (0) 1 70 27 05 67 / pascale.senellart mardon@c2n.upsaclay.fr

This PhD project is funded by the Innovative Training Network ITN QUDOT-TECH (www.qudot-tech.eu) that aims to construct a solid-state platform for on-chip quantum information processing. In this framework, our group aims at controlling the interaction between light and matter at the most fundamental quantum level: qubits. We recently developed an efficient interface between a single material qubit (the spin of a single charge) and a single photonic qubit (the polarization of a single photon). Our interface uses the spin qubit carried by a semiconductor hole, confined in a nanometer-scale InAs quantum dot (QD). This quantum dot is deterministically coupled to an electrically-contacted pillar microcavity : such technology invented in C2N has already allowed developing high-efficency sources of quantum light1, and demonstrating the first optical nonlinearity reaching the single-photon level2.
As we recently demonstrated, a photon reflected by such a QD-cavity structure can experience a drastically-enhanced rotation of its polarization, which allows mapping the spin quantum state onto a photonic polarization state3. Since then, we have implemented a technique allowing the complete tomography of a polarization qubit in the Poincaré sphere4 , and we recently demonstrated the optical probing of a single spin using single photons. In such experiment every single detected photon leads to a measurement back-action on the spin qubit.
In this thesis, we will explore the numerous perspectives of such a spin-photon interface for quantum information. A major objective will be to demonstrate new forms of spin-photon entanglement and photonphoton entanglement, and develop quantum gates mediated by the spin-photon interaction. We will also perform fundamental quantum measurements and study the dynamics of a single spin in a solid-state matrix.

Funding conditions : the PhD salary is ~2200€ net per month (+ family allowance if applicable). During its PhD the successful candidate will also benefit from an additional funding for several visiting trips (typically 1-2 months each) in the partner teams (incl. Cambridge, Basel, Grenoble, Copenhagen).

Requested profile: we welcome highly-motivated applicants with excellent background in quantum physics, optics, and/or solid state physics. Candidates must not have resided or carried out their activities – work, studies, etc.- in France for more than 12 months in the 3 years immediately before starting the PhD.

Applications (CV, transcript of studies, statement of motivation) should be sent by email to Loïc Lanco (loic.lanco@univ-paris-diderot.fr) and Pascale Senellart (pascale.senellart mardon@c2n.upsaclay.fr).

Planned starting date: 09/2020

The job description is visible here.