Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 11: Focus Session: Quantum Emitters in 3D Semiconductors

HL 11.3: Invited Talk

Monday, March 9, 2026, 16:00–16:30, POT/0251

The oxygen-related ST1 centre in diamond: a room temperature coherently controllable electron spin — •Sebastien Pezzagna — Applied Quantum Systems, Universität Leipzig, Leipzig, Germany

The development of quantum information and technologies has rapidly evolved from the beginning of the century. Nowadays, there exists a variety of defects and host crystals which are suitable for applications in quantum computing, sensing or communication, such as the nitrogen-vacancy (NV) centre in diamond. However, the reliable and scalable employment of such a system requires the ability to produce it on demand together with a deep understanding of its optical and spin properties, as well as charge states and close by environment.

In this presentation, we will discuss the so-called ST1 centre in diamond, one of the few defect centres possessing a coherently controllable electron spin at room temperature. We will first show how we could identify the nature of the ST1 centre and how it can then be produced on demand. We will then emphasize the large spin readout contrast and charge state stability which characterise the ST1 centre, and how this compares to the well-known NV centre. Finally, we will highlight the peculiarities of the ST1 centre, supported by optical spectroscopy and by investigations of the hyperfine interactions with surrounding carbon-13 nuclear spins and with the oxygen-17 nuclear spin within the centre itself.

Keywords: diamond; quantum information processing; ion implantation; nuclear spin; quantum emitter